Vascular Plants

Includes all flowering plants, conifers, ferns and fern-allies.


Browse by scientific name:

A, B, C, D, E, F, G, H, I, J, K, L, M, N, O, P, Q, R, S, T, U, V, W, X, Y, Z
Scientific names beginning with L:
Laburnum anagyroidisgolden chain-tree
Distribution: Occurring chiefly west of the Cascades crest at low elevations in Washington; British Columbia to California, east to Utah.
Habitat: Forest edge, wastelots, and other disturbed sites often in proximity to residential development where escaped from cultivation.
Origin: Introduced from Europe
Flowers: May-June
Lactuca biennistall blue lettuce, wild blue lettuce
Distribution: Yukon Territory to California, east across most of North America to the Atlantic Coast.
Habitat: Moist places at low to middle elevations.
Origin: Native
Flowers: June-August
Lactuca canadensisCanadian wild lettuce, Florida blue lettuce
Distribution: Occurring in scattered locations on both sides of the Cascades crest; Yukon Territory to California, east across North America to the Atlantic Coast.
Habitat: Fields, roadsides, disturbed forest edge, wastelots, and other disturbed places.
Origin: Introduced from central and eastern North America
Flowers: July-September
Lactuca ludovicianaLouisiana lettuce, prairie lettuce, western lettuce
Distribution: Occurring in scattered locations across Washington; southwestern British Columbia to California, east to the Great Lakes region and south-central U.S.
Habitat: Open, disturbed sites, often where moist.
Origin: Introduced from central North America
Flowers: July-September
Lactuca salignaleast lettuce, willow lettuce
Distribution: Occurring in scattered locations in Washington; Washington to California, east across the southwestern U.S. to the central U.S. and northeastern North America.
Habitat: Disturbed areas, roadsides, and meadows.
Origin: Introduced from Europe
Flowers: August-October
Lactuca sativagarden lettuce
Distribution: Occurring in scattered locations in Washington; Washington to California, east to Idaho; in scattered locations in the central U.S., more commonly distributed in eastern North America.
Habitat: Disturbed areas, often escaping from cultivation.
Origin: Introduced
Flowers: July-September
Lactuca serriolaprickly lettuce
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to California, east to the Atlantic Coast.
Habitat: Roadsides, fields, forest edge, wastelots, and other disturbed places.
Origin: Introduced from Europe
Flowers: July-September
Lactuca tataricablue lettuce
Distribution: Occurring east of the Cascades crest in Washington; Alaska to California, east to the Great Plains, Great Lakes region, and northeastern North America.
Habitat: Meadows, thickets, and other moist places at low to middle elevations.
Origin: Native
Flowers: June-September
ssp. pulchella – blue lettuce
Lactuca virosagreat lettuce, tall lettuce, wild lettuce
Distribution: Occurring west of the Cascades crest in lowland areas in Washington; also in California, Mississippi, and Maryland.
Habitat: Roadsides, ditches, sidewalks, wastelots, and other disturbed, open areas at low elevations.
Origin: Introduced from Europe
Flowers: May-October
Ladeania lanceolatawild lemonweed, lemon scurfpea, lance-leaf scurfpea
Distribution: Occurring east of the Cascades crest in Washington; Washington to California, east to the Great Plains.
Habitat: Sagebrush steppe habitat in dry areas, often where sandy.
Origin: Native
Flowers: May-June
Lagophylla ramosissimaslender hareleaf, common rabbitleaf
Distribution: Occurring east of the Cascades crest in Washington; Washington to California, east to Montana, Idaho, and Nevada.
Habitat: Dry, open areas in sagebrush plains and foothills.
Origin: Native
Flowers: May-July
Lallemantia peltatalion's heart
Distribution: Occurring east of the Cascades crest in the southeastern counties in Washington; southeastern Washington to adjacent northeastern Oregon and likely western Idaho.
Habitat: Dry slopes, roadsides, fields, and other disturbed open areas.
Origin: Introduced from Asia
Flowers: May-July
Lamium amplexicaulecommon dead-nettle, giraffehead
Distribution: Both sides of the Cascades in Washington; introduced and widespread in North America; Eurasia and North Africa.
Habitat: Weed in distrurbed areas, fields, lawns.
Origin: Introduced from Eurasia
Flowers: April-July
Lamium galeobdolonyellow archangel, yellow dead-nettle
Distribution: Occurring west of the Cascades crest in Washington; British Columbia to California, also in eastern North America.
Habitat: Lowland forest understory, often where disturbed.
Origin: Introduced from Eurasia
Flowers: April-June
Lamium hybridumcutleaf dead-nettle
Origin: Introduced from Eurasia
Lamium maculatumspotted hen-nettle, spotted henbit
Distribution: Chiefly west of the Cascades in Washington; Alaska, Oregon, Idaho; eastern North America.
Habitat: Disturbed ground.
Origin: Introduced from Eurasia
Flowers: April - August
Lamium purpureumred dead-nettle, henbit
Distribution: Occurring chiefly west of the Cascades crest in Washington; widely distributed throughout much of North America.
Habitat: Roadsides, fields, lawns, parks, wastelots, and other disturbed areas at lower elevations.
Origin: Introduced from Eurasia
Flowers: March-July
Lappula longispinalong-spined stickseed
Distribution: East of the Cascades in the Pacific Northwest; Eurasia.
Habitat: A weed in dry, disturbed places, along roadsides and on overgrazed ranges.
Origin: Introduced
Flowers: May - July
Lappula montanamontane stickseed
Distribution: Occurring east of the crest in north-central Washington; central British Columbia to north-central Washington, east to Montana.
Habitat: Dry meadows and forest openings from low to middle elevations.
Origin: Native
Flowers: May-July
Lappula occidentaliswestern stickseed
Origin: Native
var. occidentalis – western stickseed
Lappula squarrosabristly sheepburr, bristly stickseed, common stickseed, European stickseed, bristly-fruited tickweed
Distribution: Occurring east of the Cascades crest in Washington; widely distributed throughout much of North America; Eurasia.
Habitat: Shrub-steppe, disturbed areas, roadside.
Origin: Introduced from Eurasia, possibly native in northern Rocky Mts. (Cronquist et al. 1984)
Flowers: June-August
Lapsana communiscommon nipplewort
Distribution: Occurring on both sides of the Cascades crest in Washington, but more often west of the crest; Alaska to California, east across much of North America to the Atlantic Coast.
Habitat: Disturbed areas including roadsides, wastelots, fields, and forest edge.
Origin: Introduced from Eurasia
Flowers: May-July
Larix lyalliisubalpine larch
Distribution: Occurring chiefly east of the Cascades crest in Washington; southern British Columbia to the central Cascades and Wenatchee Mountains in Washington, east to Montana and Alberta.
Habitat: Generally near timberline, preferring north-facing slopes.
Origin: Native
Cones: June-July (cone production)
Larix occidentaliswestern larch
Distribution: Occurring east of the Cascades crest in Washington; British Columbia to Oregon, east to Alberta and Montana.
Habitat: Mountain valleys to middle elevations in the mountains.
Origin: Native
Cones: May-June
Lasthenia glaberrimasmooth goldfields, smooth lasthenia
Distribution: Occurring west of the Cascades crest and in the Columbia River Gorge in Washington; southern Washington to central California.
Habitat: Wet or muddy ground at low elevations, including venral pools.
Origin: Native
Flowers: May-July
Lasthenia maritimamaritime goldfields, seaside goldfields
Distribution: Occurring west of the Cascades crest along the coast in Washington; southern British Columbia to California.
Habitat: Coastal islands, headlands, and seabird nesting sites.
Origin: Native
Flowers: May-July
Lasthenia minorcoastal goldfields
Distribution: Occurring west of the Cascades crest in lowland western Washington, where known from a single collection in Skagit County; central California.
Habitat: Coastal balds and grasslands.
Origin: Native
Flowers: Arpril-May
Lathrocasis tenerrimadelicate gilia
Distribution: Known from Okanogan, Douglas, and Chelan counties in Washington; British Columbia south to California, east to Montana, Idaho, Wyoming, Utah and Nevada.
Habitat: Rocky outcroppings, Ponderosa pine forest openings, and montane shrub-steppe communities.
Origin: Native
Flowers: May-June
Lathyrus angulatusangled peavine
Distribution: Occurring east of the Cascades crest in Washington; Washington to California.
Habitat: Roadsides, fields, wastelots, and other disturbed open areas.
Origin: Introduced from Europe
Flowers: May-June
Lathyrus aphacayellow vetchling
Distribution: Known only from San Juan County in Washington; Washington to California, and in scattered locations in central and southern U.S.
Habitat: Roadsides, fields, wastelots, and other disturbed open areas.
Origin: Introduced from Europe
Flowers: May-July
Lathyrus holochlorusthin-leaf vetchling
Distribution: Occurring west of the Cascades crest in southwestern Washington; Washington to Oregon.
Habitat: Woodlands, prairies, pastures, and roadsides.
Origin: Native
Flowers: May-July
Lathyrus japonicusbeach pea
Distribution: Occurring along the Puget Sound and outer coast in Washington; Alaska to California; also along the Atlantic Coast.
Habitat: Sandy beaches, dunes, and headlands along the coast.
Origin: Native
Flowers: May-September
Lathyrus lanszwertiiNevada peavine, thick-leaved peavine
Distribution: Occurring chiefly east of the Cascades crest in Washington; British Columbia to California, east to Montana and Utah.
Habitat: Sagebrush-ponderosa pine woodland to moderate elevations in the mountains.
Origin: Native
Flowers: May-June
var. aridus – pinewoods peavine
var. bijugatus – drypark pea
var. lanszwertii – thick-leaved peavine
Lathyrus latifoliuseverlasting peavine, perennial peavine
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to California, east across North America to the Atlantic Coast.
Habitat: Roadsides, ditches, forest edge, and other disturbed areas, usually where somewhat moist.
Origin: Introduced from Europe
Flowers: May-August
Lathyrus littoralisbeach peavine, silky beach vetchling
Distribution: Occurring in the coastal counties in Washington; British Columbia to California.
Habitat: Sand dunes and sandy beaches.
Origin: Native
Flowers: May-July
Lathyrus nevadensisSierra peavine
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia south to California, east to Idaho.
Habitat: Open woods at low to moderate elevations.
Origin: Native
Flowers: May-July
var. cusickii – Cusick's pea
var. nevadensis – Sierra pea
var. parkeri – Parker's Sierra peavine
Lathyrus ochroleucuscream-flowered peavine
Distribution: Occurring east of the Cascades crest along the northern border of Washington; Alaska to Washington, east across the northern U.S. and Canada to the Atlantic Coast.
Habitat: Moist woods, at the edge of thickets.
Origin: Native
Flowers: May-July
Lathyrus palustrismarsh peavine
Distribution: Occurring along the Puget Sound and outer coast in Washington; widely distributed throughout most of North America except the Rocky Mountain and southeastern regions of the U.S.
Habitat: Chiefly in tidelands along the coast.
Origin: Native
Flowers: April-July
Lathyrus pauciflorusfew-flowered peavine
Distribution: Occurring chiefly east of the Cascades crest in Washington; Washington to California, east to Idaho and Arizona.
Habitat: Shrub-steppe to Ponderosa pine and higher open forests.
Origin: Native
Flowers: April-June
var. pauciflorus – few-flowered pea
Lathyrus polyphyllusleafy peavine
Distribution: Occurring west of the Cascades crest in lowland Washington, and east up the Columbia River Gorge; Washington to California.
Habitat: Prairies and open areas of low mountains.
Origin: Native
Flowers: May-July
Lathyrus sphaericusgrass peavine
Distribution: Occurring along the southern border of Washington; British Columbia to California.
Habitat: Fields, roadsides, ditches, and other disturbed open areas.
Origin: Introduced
Flowers: May-June
Lathyrus sylvestrisnarrow-leaf peavine
Distribution: Occurring chiefly west of the Cascades in Washington; British Columbia to Oregon, east to the Rocky Mountains, also in eastern North America
Habitat: Roadsides and waste places at low elevations.
Origin: Introduced from Europe
Flowers: May-July
Lathyrus torreyiTorrey's peavine
Distribution: Occurring west of the Cascades crest in Washington; Washington to California.
Habitat: Open prairies and clearings in the woods at low elevations.
Origin: Native
Flowers: May-July
Lathyrus tuberosustuberous pea, earth-nut peavine
Distribution: Known from Okanogan County in Washington; Washington and Montana, also in eastern North America.
Origin: Introduced from Eurasia
Flowers: May-July
Lathyrus vestitusPacific peavine
Distribution: Occurring west of the Cascades crest in Washington; Washington to California.
Habitat: Moist woodlands, open slopes, and roadsides.
Origin: Native
Flowers: April-June
var. ochropetalus – Pacific peavine
Lavandula ×intermedialavandin, lavender
Distribution: Occurring west of the Cascades crest in Washington; not currently known from elsewhere in the Pacific Northwest.
Habitat: Disturbed, open areas, where escaped from cultivation.
Origin: Introduced
Flowers: June-August
Layia glandulosawhite layia, white daisy tidytips
Distribution: Occurring east of the Cascades crest in Washington; Washington to California, east to Idaho, Utah, Arizona and New Mexico.
Habitat: Dry, open areas from sagebrush desert to low elevations in the mountains.
Origin: Native
Flowers: April-June
Leersia oryzoidesrice cut grass
Distribution: Occurring on both sides of the Cascades in Washington; British Columbia east to the Atlantic Coast, south throughout the U.S.
Habitat: Wet places, often in fairly deep water.
Origin: Native
Flowers: July-September
Lemna minorcommon duckweed, lesser duckweed, water lentil
Distribution: Cosmopolitan in temperate and subtropical regions
Habitat: In standing or slow-moving fresh water
Origin: Native
Flowers: June - October
Lemna minutaleast duckweed
Origin: Native
Lemna trisulcaivy duckweed, ivy-leaved duckweed, star duckweed
Distribution: Throughout much of the temperate and subtropical regions of the world.
Habitat: Quiet streams and standing fresh water.
Origin: Native
Flowers: July - September
Lemna turioniferaturion duckweed
Distribution: Occurring in aquatic environments throughout Washington; cosmopolitan in temperate and subtropical regions.
Habitat: In standing or slow-moving fresh water.
Origin: Native
Flowers: June-October
Leontodon autumnalisautumn hawkbit
Distribution: Occurring chiefly west of the Cascades crest in Washington; Alaska to Oregon, east to Idaho and Montana; also in eastern North America.
Habitat: Roadsides, pastures, open fields and other disturbed areas primarily in the lowlands, but also found along roads at alpine elevations in the mountains (e.g., Mt. Baker area).
Origin: Introduced from Eurasia
Flowers: July-September
Leontodon saxatilishairy hawkbit
Distribution: Occurring chiefly west of the Cascades crest in Washington; British Columbia to California, Nevada, and Arizona, also in central and eastern North America.
Habitat: Roadsides, meadows, wastelots, and other disturbed, open areas.
Origin: Introduced from Europe
Flowers: July-September
ssp. saxatilis – lesser hawkbit
Leonurus cardiacamotherwort, Lion's tail
Distribution: Scattered location in Washington; found occasionally in North America.
Habitat: Disturbed ground, often in association with cities and towns.
Origin: Introduced from Eurasia
Flowers: June-September
Lepidium appelianumglobepodded hoarycress, whitetop
Distribution: Widely distributed throughout many areas in Washington, though more common east of the Cascades crest; widely distributed throughout much of North America.
Habitat: Disturbed soil, waste areas, in dry and moist places.
Origin: Introduced from Asia
Flowers: April-August
Lepidium campestrefield cress, field peppergrass pepperwort
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to California, east across most of North America to the Atlantic Coast.
Habitat: Roadsides, fields, meadows, river and stream banks, wastelots, and other distrubed open, often dry soils.
Origin: Introduced from Eurasia
Flowers: May-July
Lepidium chalepensechalapa hoarycress, lens-podded hoarycress, Asian white-top
Distribution: Occurring east of the Cascades crest in Washington; widely distributed throughout much of North America.
Habitat: Disturbed areas, especially where dry, often associated with agriculture.
Origin: Introduced from Asia
Flowers: May-June
Lepidium densiflorumcommon peppergrass, elongate peppergrass, hairy-fruited peppergrass, large-fruited peppergrass, prairie peppergrass
Distribution: Chiefly east of the Cascades in Washington; widely distributed throughout North America.
Habitat: Dry, open areas.
Origin: Native
Flowers: April-June
Lepidium dictyotumalkali peppergrass, veiny peppergrass
Distribution: Occurring east of the Cascades crest in Washington; Washington south to California, east to Idaho, Nevada, and Utah.
Habitat: Open areas often where seasonally moist, such as vernal ponds; tolerant of alkaline soils.
Origin: Native
Flowers: April-May
Lepidium didymumlesser swinecress, lesser wartcress
Distribution: Occurring west of the Cascades crest in Washington; British Columbia south to California and Arizona, and Texas eastward and northward to the Atlantic Coast.
Habitat: Roadsides, gardens and wasteland.
Origin: Introduced from South America (or possibly Eurasia)
Flowers: May-July
Lepidium drabaheart-podded hoarycress, hoary pepperwort
Distribution: Occurring chiefly east of the Cascades crest in Washington; widely distributed throughout much of North America.
Habitat: Widespread weed in lowlands.
Origin: Introduced from Eurasia
Flowers: April-August
Lepidium heterophyllumpurple-anther pepperweed, Smith's pepperweed
Distribution: Occurring chiefly west of the Cascades crest and in the Columbia River Gorge in Washington; British Columbia to California, also in scattered locations in the eastern U.S.
Habitat: Roadsides, fields, meadows, pastures, wastelots, and other disturbed ground.
Origin: Introduced from Europe
Flowers: May-June
Lepidium latifoliumdittander, broad-leaved peppergrass, broad-leaved pepperwort
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to California, east to the Great Plains and eastern North America.
Habitat: Disturbed, moist areas, irrigated land, stream banks, and drier upland areas.
Origin: Introduced from Eurasia
Flowers: June-September
Lepidium nitidumshining peppergrass
Distribution: Known from Klickitat County in Washington; Washington south to California.
Habitat: Dry, open areas at low elevation.
Origin: Native
Flowers: March-April
Lepidium oblongum
Origin: Introduced
Lepidium oxycarpumforked pepperwort, sharpfruited pepperwort
Distribution: Chiefly in south-central California, rare in the Pacific Northwest.
Habitat: Usually on saline soil.
Origin: Native
Flowers: March - May
Lepidium perfoliatumclasping-leaved peppergrass, round-leaved peppergrass, yellow-flowered peppergrass, clasping peppergrass pepperwort
Distribution: Chiefly east of the Cascades in Washington; widely distributed throughout North America.
Habitat: Disturbed areas, such as overgrazed land and waste areas, usually where dry.
Origin: Introduced from Eurasia
Flowers: March-June
Lepidium ramosissimumbranched peppergrass, dull peppergrass
Distribution: Chiefly east of the Cascades in Washington; widely distributed throughout much of western and northern North America.
Habitat: Sagebrush, ponderosa pine forest openings, roadsides, fields, and other disturbed open areas.
Origin: Native
Flowers: June-August
Lepidium sativumgarden cress pepperwort
Origin: Introduced from western Asia
Flowers: April - June
Lepidium strictumupright peppergrass
Origin: Introduced
Lepidium virginicumtall pepperweed
Distribution: Throughout the United States, north to Alaska
Habitat: Weedy native of the lowlands
Origin: Native
Flowers: March - June
ssp. menziesii – coastal peppergrass, hairy peppergrass, Idaho peppergrass, Menzies' peppergrass, tall peppergrass, tall western peppergrass
Leptarrhena pyrolifoliapearleaf, leatherleaf saxifrage
Distribution: Occurring on both sides of the Cascades crest in Washington, including the Olympic Mountains; Alaska to Oregon, east to Northwest Territory, Alberta, and Montana.
Habitat: Streambanks, seeps and wet meadows, mid- to high elevations in the mountains.
Origin: Native
Flowers: June-August
Leptosiphon bicolorbicolored babystars, bicolored linanthus
Distribution: Occurring west of the Cascades crest and east in the Columbia River Gorge in Washington; southwestern British Columbia to California.
Habitat: Open areas at lower elevations.
Origin: Native
Flowers: April-June
Leptosiphon bolanderiBolander's desert-trumpets, Baker's linanthus
Distribution: Near the east base of the Cascades in Klickitat County, Washington, and in the Sierra Nevada and Coast Range of California.
Habitat: Dry, open places at lower elevations, often on serpentine.
Origin: Native
Flowers: April-May
Leptosiphon harknessiiHarkness's desert-trumpets, three-seed desert-trumpets
Distribution: Occurring east of the Cascades crest in Washington; southern British Columbia to California, east to Idaho and Utah.
Habitat: Drier open places, from the foothills to middle elevations in the mountains, often where moist to wet in spring.
Origin: Native
Flowers: June-August
Leptosiphon liniflorusflax-flower desert-trumpets, thread-stem linanthus, thread-stemmed linanthus
Distribution: Occurring east of the Cascades crest in Washington; Washington south to California.
Habitat: open, dry areas in sagebrush flats to Ponderosa pine forests.
Origin: Native
Flowers: April-June.
Leptosiphon minimustrue babystars
Distribution: Occurring west of the Cascades crest in Washington in the Puget Trough lowlands; southern Vancouver Island to California.
Habitat: Prairies, balds, and open, grassy, rocky areas near the coast.
Origin: Native
Flowers: May-June
Leptosiphon nuttalliiNuttall's linanthus
Distribution: In the Cascade and Blue Mountains of Washington; Washington south to California, east to Montana, Colorado and New Mexico.
Habitat: Open rocky slopes at mid- to high elevations in the mountains.
Origin: Native
Flowers: June-August
ssp. nuttallii – Nuttall's linanthus
Leptosiphon septentrionalisnorthern desert-trumpets, northern linanthus
Distribution: Occurring east of the Cascades crest in Washington; British Columbia south to California, east to northern Rocky Mountains and Great Plains.
Habitat: In seasonally wet open plains and slopes from low to moderate elevations.
Origin: Native
Flowers: May-July
Lepyrodiclis holosteoidesFalse jagged-chickweed
Origin: Introduced
Leucanthemum ×superbumShasta daisy
Distribution: Occurring in lowlands in western Washington; British Columbia to Oregon, also in eastern North America.
Habitat: Disturbed areas where often escaped from cultivation.
Origin: Introduced
Flowers: May-August
Leucanthemum vulgareoxeye daisy
Distribution: Widely distributed on both sides of the Cascades crest in Washington; Alaska to California, east across most of North America to the Atlantic Coast.
Habitat: Open, disturbed areas including roadsides, pastures, prairies, grasslands and wastelots.
Origin: Introduced from Eurasia
Flowers: May-October
Lewisia columbianaColumbia lewisia
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to California, east to Idaho and Montana.
Habitat: Open gravelly or rocky slopes and rock crevices at middle to high elevations in the mountains.
Origin: Native
Flowers: May-August
var. columbiana – Columbia lewisia
var. rupicola – Columbia lewisia
Lewisia cotyledonSiskiyou lewisia
Origin: Introduced
Lewisia nevadensisNevada bitterroot
Distribution: Olympic and Cascade Mountains of Washington, south to California.
Habitat: Open, often gravelly, moist to mesic areas at moderate elevations in the mountains to above tree line.
Origin: Native
Flowers: Late May - August
Lewisia pygmaealeast, alpine lewisia, dwarf lewisia
Distribution: Occurring in the Olympic and Cascade Mountains of Washington; British Columbia south to California, east to the Rocky Mountains.
Habitat: Open, often gravelly, moist to rather dry areas, mid- to high elevations in the mountains.
Origin: Native
Flowers: May-August
Lewisia redivivabitterroot
Distribution: Occurring east of the Cascades crest in Washington; southern British Columbia to California, east to Montana, Wyoming, Utah, Colorado, and Arizona.
Habitat: Open gravelly and rocky areas from sagebrush plains to moderate elevations in the mountains.
Origin: Native
Flowers: April-June
var. rediviva – bitterroot
Lewisia triphyllathree leaf bitterroot, three leaf lewisia
Distribution: Occurring chiefly east of the Cascades crest in Washington; Washington to California, east to Montana and south in the Rocky Mountains.
Habitat: Open, usually sandy areas where vernally moist, ponderosa pine forests to subalpine meadows.
Origin: Native
Flowers: May-August
Lewisiopsis tweedyiTweedy's lewisia
Distribution: Occurring east of the Cascades crest in Kittitas, Chelan, and Okanogan counties in Washington; endemic to southern British Columbia and north-central Washington.
Habitat: Rock outcroppings and dry slopes of open ponderosa pine/Douglas fir forests.
Origin: Native
Flowers: April-June
Leymus cinereusGreat Basin lyme grass
Distribution: East of the Cascades in Washington; central and western North America.
Habitat: Sagebrush-steppe, arid grasslands, forest edges, and other dry, open areas in the intermountain west.
Origin: Native
Flowers: June-July
Leymus condensatusgiant wildrye
Origin: Native
Leymus flavescenssand lyme grass
Origin: Native
Flowers: June - July
Leymus mollisAmerican dunegrass
Distribution: Occurring west of the Cascades crest in Washington along the immediate marine coastline; Alaska to California, east across Canada to the Great Lakes region and northeastern North America.
Habitat: Coastal sand dunes, marshes, and headlands, where tolerant of salt water.
Origin: Native
Flowers: June-August
ssp. mollis – yellow ryegrass
Leymus racemosusmammoth lyme grass, mammoth wildrye
Distribution: Occurring east of the Cascades crest in Washington; central Washington to north-central Oregon, east to Wyoming.
Habitat: Sandy areas in sagebrush flats and plains.
Origin: Introduced from Eurasia
Flowers: July-August
Leymus triticoidesbeardless lyme grass, beardless wildrye
Distribution: Occurring east of the Cascades crest in Washington; British Columbia to California, east to the Rocky Mountains and Texas.
Origin: Native
Flowers: June-August
Leymus ×vancouverensisVancouver wildrye
Origin: Native
Ligusticum apiifoliumcelery-leaf wild lovage, parsely-leaf wild lovage
Distribution: Occurring west of the Cascades crest in Washington; Washington to California.
Habitat: Low elevation woodland slopes, prairies, and thickets.
Origin: Native
Flowers: May-July
Ligusticum canbyiCanby's wild lovage
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to Oregon, east to Alberta and western Montana.
Habitat: Wet to somewhat dry soil, from montane forest openings to subalpine and alpine areas.
Origin: Native
Flowers: May-August
Ligusticum grayiGray's lovage, sheep wild lovage
Distribution: Widely distributed on both sides of the Cascades crest in the mountainous areas of Washington; northern Washington to California and Nevada, east to Idaho and Montana.
Habitat: Moist or sometimes dry open slopes and drier meadows in subalpine and alpine areas.
Origin: Native
Flowers: July-September
Ligustrum ×iboleum
Origin: Introduced
Ligustrum obtusifolium
Origin: Introduced
Ligustrum ovalifoliumCalifornia privet
Origin: Introduced
Ligustrum vulgarecommon privet
Distribution: Occurring west of the Cascades in Washington; British Columbia south to Texas, east to the Atlantic Coast
Habitat: At low elevations in forest understory, forest and prairie edges, and disturbed areas.
Origin: Introduced
Flowers: April-May
Lilaeopsis occidentaliswestern grasswort, western lilaeopsis
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California.
Habitat: Marshes, river banks, salt flats, muddy or sandy beaches and shores along and near the coast.
Origin: Native
Flowers: June-July
Lilium columbianumColumbia lily
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to California, east to northwestern Montana.
Habitat: Prairies, forest edge, forest openings, and meadows from sea level to to the subalpine.
Origin: Native
Flowers: May-August
Limnanthes douglasiiDouglas's meadow-foam
Origin: Introduced
Limnobium laevigatumfrogbit
Distribution: Known from Pacific County in Washington; also known from California and eastern U.S.
Habitat: Lowland ponds, where found floating on water's surface.
Origin: Introduced
Flowers: June-September
Limonium californicumwestern marsh-rosemary
Distribution: Occurring west of the Cascades crest in Washington along the coast; northwestern Washington to Baja California, Mexico.
Habitat: Coastal salt marshes.
Origin: Introduced from Oregon or California
Flowers: July-September
Limosella acaulisstemless mudwort
Origin: Native
Limosella aquaticaawl-leaf mudwort
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east to the northern Great Plains and further eastward to northeastern North America.
Habitat: In shallow water or wet mud of rivers, lakes, and ponds at low to middle elevations.
Origin: Native
Flowers: June-October
Linanthus pungensprickly phlox
Distribution: Occurring east of the Cascades crest in Washington; British Columbia to Baja California, east to the Rocky Mountains.
Habitat: Dry, open, sandy or rocky places, from sagebrush desert and plains to moderate elevations in the drier mountains.
Origin: Native
Flowers: May-July
Linaria dalmaticadalmation toadflax
Distribution: Widely distributed throughout Washington, but more prevalent east of the Cascades crest; widely distributed throughout most of North America except southeastern region.
Habitat: Open areas roadsides, fields, wastelots, forest openings, typically where disturbed.
Origin: Introduced
Flowers: May-August
ssp. dalmatica – brown-leaved toadflax, Dalmatian toadflax, dalmatian toadflax
Linaria genistifoliabroomleaf toadflax
Origin: Introduced
Linaria grandifloralarge-flowered linaria
Origin: Introduced
Linaria purpureapurple toadflax
Distribution: Introduced as an ornamental, occasionally escaping west of the Cascades in Washington.
Habitat: Bare and disturbed ground.
Origin: Introduced from Mediterranean
Flowers: June - August
Linaria vulgarisgreater butter-and-eggs
Distribution: Widely distributed across Washington; widely distributed throughout North America.
Habitat: Noxious weed of roadsides, wastelots, and disturbed areas.
Origin: Introduced from Europe
Flowers: June-September
Lindernia dubiafalse pimpernel
Distribution: Occurring on both sides of the Cascades crest in Washington; widely distributed throughout North America.
Habitat: Disturbed, open soil, often where moist near ponds, lakes, and streams, from low to middle elevations.
Origin: Native
Flowers: May-October
Linnaea borealistwinflower
Distribution: Widely distributed in forested and mountainous areas on both sides of the Cascades crest in Washington; Alaska to California, east in North America to the Atlantic Coast; circumboreal.
Habitat: Open forest, forest edges, and peatlands from low elevations to the alpine.
Origin: Native
Flowers: May-September
ssp. longiflora – longtube twinflower
Linum lewisiiwild blue flax
Distribution: Occurring chiefly east of the Cascades crest in Washington; widely distributed throughout much of western North America.
Habitat: Dry, open areas from prairies to alpine ridges.
Origin: Native
Flowers: May-July
var. lewisii – wild blue flax
Linum perenneblue garden flax
Origin: Introduced
Linum usitatissimumlinseed
Origin: Introduced
Flowers: June - November
Liparis loeseliifen orchid, Loesel's twayblade
Distribution: Occasional, Saskatchewan to Nova Scotia, south to North Dakota and Iowa; Klickitat and Yakima Counties in Washington.
Habitat: Around springs and in bogs.
Origin: Native
Flowers: July - August
Lipocarpha aristulatahalfchaff sedge
Distribution: Occurring along the Columbia River in central and south-central Washington; Washington to California and Arizona, east in Great Plains and central U.S.
Habitat: sandy soils of shorelines, stream banks, ponds, and ditches.
Origin: Native
Flowers: June-August
Lipocarpha micranthasmall-flowered halfchaff sedge
Origin: Native
Flowers: June - September
Lipocarpha occidentaliswestern halfchaff sedge
Origin: Native
Flowers: June - September
Lithophragma glabrumbulbiferous prairie star, bulbous woodlandstar
Distribution: Occurring east of the Cascades crest in Washington; British Columbia to California, east to the Rocky Mountains and northern Great Plains.
Habitat: Grasslands and sagebrush desert to ponderosa pine and Douglas-fir forest openings.
Origin: Native
Flowers: April-June
Lithophragma parviflorumsmall-flowered prairie star
Distribution: Widely distributed on both sides of the Cascades crest in Washington; British Columbia to California, east to the Rocky Mountains and Great Plains.
Habitat: Prairies, balds, sagebrush desert, and forest openings, sea level to mid-elevations in the mountains.
Origin: Native
Flowers: April-June
Lithophragma tenellumslender prairie star, slender woodlandstar
Distribution: Occurring east of the Cascades crest in Washington; British Columbia to California, east to the Rocky Mountains.
Habitat: Sagebrush desert and ponderosa pine forests openings.
Origin: Native
Flowers: April-June
Lithospermum incisumfringed stoneseed
Origin: Native
Lithospermum ruderalewestern gromwell, Columbian puccoon, western stoneseed
Distribution: Occurring east of the Cascades crest in Washington; southern British Columbia to California, east to the Sasketchewan and the Rocky Mountains.
Habitat: Sagebrush desert to ponderosa pine forest openings, from low to middle elevations in the mountains.
Origin: Native
Flowers: April-June
Lloydia serotinaalpine lily
Distribution: In the Olympic and Cascade mountains of Washington; Alaska south to Oregon, east to Montana and Alberta, and south in the Rockies to New Mexico.
Habitat: Gravelly ridges, cliffs and rock crevices at high elevations.
Origin: Native
Flowers: June-September
var. serotina – alpine lily
Lobelia dortmannawater lobelia
Distribution: West of the Cascades in Washington; Vancouver Island and adjacent mainland in British Columbia, south to the Cascades of northern Oregon.
Habitat: In shallow water at the margins of ponds and lakes.
Origin: Native
Flowers: June-August
Lobelia erinustrailing lobelia
Origin: Introduced
Lobelia kalmiibrook lobelia
Origin: Native
Flowers: July - August
Lobularia maritimasweet alison, sweet alyssum
Distribution: Occurring in scattered locations across Washington; British Columbia south to Texas; also occurring throughout central and eastern North America.
Habitat: Escaping from cultivation to roadsides, pastures, and other disturbed areas, often where moist.
Origin: Introduced from the western Mediterranean
Flowers: April-August
Loeflingia squarrosaspreading pygmyleaf
Distribution: Occurring east of the Cascades crest in Washington, where disjunct in Benton County. southeastern Oregon to California, east to the southern Rocky Mountains and southern Great Plains.
Habitat: Dry, sandy, or gravelly desert areas.
Origin: Native
Flowers: May-June
Logfia gallicadaggerleaf cottonweed
Distribution: Known from east of the Cascades crest in Washington; central Washington, and Willamette Valley Oregon to California.
Habitat: Roadsides, fields, wastelots, and other disturbed areas.
Origin: Introduced from Eurasia
Flowers: June-August
Logfia minimalittle cottonrose
Distribution: Occurring chiefly west of the Cascades crest in Washington; British Columbia to Oregon, also in eastern North America.
Habitat: Heaths, sandy soils, and other disturbed, open areas.
Origin: Introduced from Europe
Flowers: June-Sept.
Lolium multiflorumannual ryegrass, Italian ryegrass, perennial ryegrass
Distribution: Introduced and well established in much of temperate North America.
Habitat: Roadsides and waste ground.
Origin: Introduced
Flowers: May - July
Lolium perenneEnglish ryegrass, perennial ryegrass
Distribution: Commonly cultivated as a forage plant; escaped and well established in the Pacific Northwest.
Habitat: Old fields, roadsides, and waste places.
Origin: Introduced
Flowers: May - July
Lolium persicumPersian ryegrass
Lolium temulentumdarnel, tare
Origin: Introduced
Flowers: May - June
ssp. temulentum – darnel
Lomatium ambiguumWyeth biscuit-root, stream bank desert-parsley, swale desert-parsley, lacy lomatium
Distribution: Occurring chiefly east of the Cascades crest in Washington; southern British Columbia to northeast Oregon, east to southeastern Alberta, western Montana, and Wyoming.
Habitat: Open, often rocky slopes and flats, from the foothills to middle elevations in the mountains.
Origin: Native
Flowers: May-July
Lomatium anomalumanomalous biscuit-root, nine-leaved biscuit-root
Distribution: Occurring east of the Cascades crest in the southeastern counties of Washington; southeastern Washington to eastern Oregon, east to western Idaho and northwestern Montana.
Habitat: Open slopes, usually on clay soils.
Origin: Native
Flowers: April-June
Lomatium bradshawiiBradshaw's biscuit-root, Bradshaw's desert-parsley, Bradshaw's lomatium
Distribution: Occurring west of the Cascades crest in Clark County in Washington; southwestern Washington to the Willamette Valley near Eugene, Oregon.
Habitat: Wet meadows at low elevations.
Origin: Native
Flowers: May-June
Lomatium brandegeeiBrandegee's desert-parsley
Distribution: Occurring chiefly east of the Cascades crest in Washington; south-central British Columbia to south-central Washington.
Habitat: Open to wooded slopes from middle elevations to the subalpine.
Origin: Native
Flowers: May-August
Lomatium brevifoliumnarrowfruit biscuit-root, short-leaved biscuit-root, short-leaved desert-parsley
Distribution: Occurring on both sides of the Cascades crest and in the Columbia River Gorge in Washington; north-central Washington to Hood River and Wasco counties in Oregon.
Habitat: Balds, slopes, and forest openings, often where rocky, from the lowlands to subalpine.
Origin: Native
Flowers: May-July
Lomatium canbyiCanby's biscuit-root, chucklusa, Canby's desert-parsley
Distribution: Occurring east of the Cascades crest in Washington chiefly in the Columbia River Basin. central Washington to northeastern Nevada, east to southwestern Idaho.
Habitat: Scablands and sagebrush steppe in rather deep soil.
Origin: Native
Flowers: March-April
Lomatium columbianumpurple biscuit-root, Columbia Gorge desert-parsley
Distribution: Occurring east of the Cascades crest in the south-central and Columbia River Gorge areas in Washington; south-central Washington to Hood River and Wasco counties in Oregon.
Habitat: Open slopes in low elevation valleys to low montane.
Origin: Native
Flowers: March-April
Lomatium couscous biscuit-root, cous, cous-root desert-parsley
Distribution: Occurring east of the Cascades crest in the southeastern counties in Washington; southeastern Washington to northeast Nevada, east to Montana and Wyoming.
Habitat: Dry, open, often rocky places often with sagebrush; common at low elevations, occasionally found at higher elevations.
Origin: Native
Flowers: April-July
Lomatium cuspidatumWenatchee biscuit-root, Wenatchee desert-parsley, Wenatchee Mountain lomatium
Distribution: Occurring east of the Cascades crest, where endemic to the Wenatchee Mountains of Chelan and Kittitas counties in Washington.
Habitat: Open, rocky slopes, often on serpentine, from middle elevations to the subalpine.
Origin: Native
Flowers: May-July
Lomatium dissectumfern-leaved biscuit-root, sessile-fruited fern-leaved biscuit-root, fern-leaved desert parsley, fern-leaved lomatium
Distribution: Occurring on both sides of the Cascades crest in Washington; southwestern British Columbia to California, disjunct in west-central Idaho.
Habitat: Open areas from the valleys and foothills to middle elevations in the mountains
Origin: Native
Flowers: April-June
Lomatium farinosumnorthern biscuit-root, Hamblen's lomatium
Distribution: Occurring east of the Cascades crest in Washington; central Washington to western Idaho, disjunct in Wasco County, Oregon.
Habitat: Rocky slopes and scablands, often on lithosol and with sagebrush.
Origin: Native
Flowers: April-May
Lomatium geyeriGeyer's desert-parsley, Geyer's lomatium
Distribution: Occurring chiefly east of the Cascades crest in Washington; southern British Columbia to Washington, east to Idaho.
Habitat: Deeper soil in low to mid-elevations of open, dry areas, and under Ponderosa pine.
Origin: Native
Flowers: March-June
Lomatium gormaniiGorman's desert-parsley, Gorman's lomatium, salt and pepper
Distribution: Occurring east of the Cascades crest in Washington; Washington to Oregon, east to Idaho.
Habitat: Open slopes and scablands in the foothills, valleys and plains, often with sagebrush.
Origin: Native
Flowers: February-May
Lomatium klickitatenseKlickitat biscuit-root, Klickitat desert-parsley, Klickitat lomatium
Distribution: Occurring east of the Cascades crest in the Columbia River Gorge area in Washington; south-central Washington to adjacent Oregon.
Habitat: Dry to seasonally moist, areas and forest openings at low to middle elevations.
Origin: Native
Flowers: April-May
Lomatium knokeiKnoke's biscuit-root, Knoke's desert-parsley, Knoke's lomatium
Distribution: Occurring east of the Cascades crest, where endemic to Kittitas County.
Habitat: Open, vernally wet, gently sloping meadows of fine-textured clay soils at approximately 1200 meters.
Origin: Native
Flowers: May-June
Lomatium laevigatumsmooth biscuit-root, slickrock desert-parsley, smooth lomatium
Distribution: Occurring east of the Cascades crest in south-central Washington; south-central Washington to adjacent Oregon.
Habitat: Crevices is basalt cliffs.
Origin: Native
Flowers: April
Lomatium leptocarpumgumbo biscuit-root, gumbo lomatium
Distribution: Occurring east of the Cascades crest in the southeastern counties in Washington; southeastern Washington to southern Oregon, east to western Idaho.
Habitat: Seasonally wet, usually shallow-soil meadows, and micro-depressions in vernally wet, rocky sites, often with clay component.
Origin: Native
Flowers: May-June
Lomatium linearifoliumlinear-leaved biscuit-root, linear-leaved desert-parsley, linear-leaved lomatium, turkey peas
Distribution: Occurring east of the Cascades crest in Washington; central Washington to north-central Oregon, east to Montana and Wyoming.
Habitat: Open slopes and ridges, from low to middle elevations.
Origin: Native
Flowers: March-May
Lomatium lithosolamansHoover's biscuit-root, Hoover's desert-parsley, Hoover's lomatium
Distribution: Occurring east of the Cascades crest, where endemic to Kittitas and Yakima counties.
Habitat: Open, rocky, shallow soil on xeric sites at low to middle elevations.
Origin: Native
Flowers: March-April
Lomatium macrocarpumlarge-fruit desert-parsley, bigseed lomatium
Distribution: Widely distributed east of the Cascades crest in Washington; British Columbia to California, east to the Rocky Mountains and northern Great Plains.
Habitat: Open, dry, rocky areas at low elevations.
Origin: Native
Flowers: March-May
Lomatium martindaleiCascade biscuit-root, Cascade desert-parsley
Distribution: Occurring chiefly west of the Cascades crest in Washington; British Columbia to northern California.
Habitat: Dry meadows and rocky outcroppings from middle elevations to the alpine.
Origin: Native
Flowers: May-September
Lomatium multifidumfern-leaved biscuit-root, fern-leaved desert-parsley, fern-leaved lomatium
Distribution: Occurring east of the Cascades crest in Washington; southern British Columbia to California, east to the Rocky Mountains.
Habitat: Open, often rocky slopes and dry meadows, lowlands to low alpine areas.
Origin: Native
Flowers: April-June
Lomatium nudicaulebare-stemmed biscuit-root
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to California, east to Idaho and Utah.
Habitat: Dry, open areas, including on lithosols, from lowlands to middle elevations in the mountains.
Origin: Native
Flowers: April-June
Lomatium papilioniferumbutterfly bearing biscuit-root, butterfly bearing desert-parsley
Distribution: Occurring east of the Cascades crest in Washington; southern British Columbia to California, east to Idaho and Nevada.
Habitat: Sagebrush desert and open slopes at low to moderate elevations.
Origin: Native
Flowers: April-June
Lomatium piperiPiper's biscuit-root, Piper's desert-parsley
Distribution: Occurring east of the Cascades crest in Washington; central Washington to northern California.
Habitat: Sagebrush desert to ponderosa pine forest openings.
Origin: Native
Flowers: April-June
Lomatium quintuplexUmptanum biscuit-root, Umptanum desert-parsley
Distribution: Occurring east of the Cascades crest in central Washington, where endemic to eastern Kittitas County and northeastern Yakima County.
Habitat: Generally in lithosol areas in sagebrush desert.
Origin: Native
Flowers: March-May
Lomatium rollinsiiRollins's biscuit-root, Rollins's desert-parsley
Distribution: Occurring east of the Cascades crest in the southeastern counties in Washington; southeastern Washington to the canyons of the Snake and lower Salmon Rivers in eastern Oregon and western Idaho.
Habitat: Open slopes in grasslands, on rocky or fine-textured, loess-derived soils, from valleys to the montane.
Origin: Native
Flowers: April-May
Lomatium roneorumRone's biscuit-root, Rone's desert-parsley
Distribution: Occurring east of the Cascades crest, where endemic to Chelan County.
Habitat: Open, rocky slopes in Ponderosa pine forest openings.
Origin: Native
Flowers: April-June
Lomatium salmoniflorumSalmon River biscuit-root, Salmon River desert-parsley
Distribution: Occurring east of the Cascades crest in the southeastern counties in Washington; southeastern Washington to the Snake and Clearwater rivers in Idaho.
Habitat: Dry, open, rocky slopes.
Origin: Native
Flowers: March-May
Lomatium sandbergiiSandberg's biscuit-root, Sandberg's desert-parsley
Distribution: Occurring east of the Cascades crest in northeastern Washington; southeastern British Columbia to northeastern Washington, east to southeastern Alberta and northwestern Montana.
Habitat: Rocky slopes and ridges at middle elevations.
Origin: Native
Flowers: May-June
Lomatium serpentinumSnake Canyon biscuit-root, Snake Canyon desert-parsley
Distribution: Occurring east of the Cascades crest in the southeastern counties in Washington; southeastern Washington to the Hells Canyon area of Oregon and Idaho.
Habitat: Dry, open, often rocky slopes from lowland valleys to the montane.
Origin: Native
Flowers: April-July
Lomatium simplexnine-leaf biscuit-root, nine-leaf desert-parsley
Distribution: Occurring east of the Cascades crest in Washington; British Columbia to Oregon, east to Montana and Colorado.
Habitat: Moderately dry to moist grasslands and forest openings at low to middle elevations.
Origin: Native
Flowers: March-May
Lomatium suksdorfiiSuksdorf's biscuit-root, Suksdorf's desert-parsley
Distribution: Occurring east of the Cascades crest in Washington at the east end of the Columbia River Gorge in Klickitat County; south-central Washington to Hood River and Wasco counties in Oregon.
Habitat: Open slopes, forest edge and openings, often where dry, from low to middle elevations.
Origin: Native
Flowers: April-May
Lomatium tamanitchiiribseed biscuit-root, ribseed desert-parsley
Distribution: Occurring east of the Cascades crest at the east end of the Columbia River Gorge in Washington, where endemic to Klickitat County.
Habitat: Open slopes and valleys, typically in clay-rich, silicic volcanic ash-derived soils at low elevations.
Origin: Native
Flowers: April-May
Lomatium tenuissimumLeiberg's biscuit-root, Leiberg's umbrella-wort
Distribution: Historically occurring east of the Cascades crest along the eastern border of southern Washington; eastern Washington to adjacent western Idaho.
Habitat: Vernally moist meadows with fine-textured soils at low to middle elevations.
Origin: Native
Flowers: April-May
Lomatium thompsoniiThompson's biscuit-root, Thompson's desert-parsley
Distribution: Occurring east of the Cascades crest in Washington, where endemic to Chelan and Kittitas counties.
Habitat: Open, rocky slopes and ponderosa pine forest openings, from low to middle elevations.
Origin: Native
Flowers: May-June
Lomatium triternatumtriternate biscuit-root
Distribution: Occurring east of the Cascades crest in Washington; southern British Columbia to Oregon, east to Alberta and western Montana.
Habitat: Open hillsides and slopes, forest edge and opening, typically where dry, from low to middle elevations.
Origin: Native
Flowers: April-July
Lomatium tuberosumHoover's biscuit-root, Hoover's lomatium, potato desert-parsley
Distribution: Occurring east of the Cascades crest in central Washington, where endemic to Benton, Grant, Kittitas, and Yakima counties. Scattered locations in Yakima County, Washington, and adjacent counties.
Habitat: Rocky slopes and talus fields at middle elevations .
Origin: Native
Flowers: March-April
Lomatium utriculatumcommon biscuit-root, bladder desert-parsley, spring-gold
Distribution: Occurring west of the Cascades crest in Washington; southern British Columbia to California.
Habitat: Grassy balds, prairies, meadows, and open slopes, often at low elevations.
Origin: Native
Flowers: April-June
Lomatium watsoniiWatson's biscuit-root, Watson's desert-parsley
Distribution: Occurring east of the Cascades crest in central and south-central Washington; central Washingotn to Wasco County, Oregon.
Habitat: Open hillsides, often with sagebrush, from valleys to subalpine.
Origin: Native
Flowers: May-July
Lonicera ×bellashowy fly honeysuckle
Distribution: Occurring on both sides of the Cascades crest in Washington; southern British Columbia to Oregon and Idaho, scattered localities in central North America, and more widespread in eastern North America.
Habitat: Forest edge and understory, riparian areas, and disturbed areas at low to moderate elevations.
Origin: Introduced
Flowers: April-June
Lonicera caurianabluefly honeysuckle, sweet-berry honeysuckle
Distribution: Reported from Washington; Alaska to California, also in Idaho.
Origin: Native
Lonicera ciliosaorange honeysuckle
Distribution: Occurring in or near forested areas on both sides of the Cascades crest in Washington; British Columbia to Oregon, east to Montana.
Habitat: Open to rather dense woods, low to mid-elevations in the mountains.
Origin: Native
Flowers: May-July
Lonicera conjugialispurple-flower honeysuckle
Distribution: Mt. Adams south chiefly through the east side of the Cascades in Washington; south to the Sierra Nevada of California.
Habitat: In woods, meadows and moist open slopes at mid-elevations in the mountains.
Origin: Native
Flowers: June-July
Lonicera etruscaEtruscan honeysuckle
Distribution: Occasional west of the Cascades in Washington; established along the Oregon coast and southern British Columbia.
Habitat: Thickets and waste areas.
Origin: Introduced
Flowers: June-August
Lonicera hispidulahairy honeysuckle, pink honeysuckle
Distribution: Occurring west of the Cascades crest in lowland western Washington; British Columbia to California.
Habitat: Forest understory and edge, thickets, balds, and open woodlands at low elevations.
Origin: Native
Flowers: May-July
Lonicera involucratabearberry honeysuckle, black twin-berry
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east to the Rocky Mountains.
Habitat: Forest openings and edge, thickets, and marshes from low elevations to the subalpine.
Origin: Native
Flowers: April-August
var. involucrata – bearberry honeysuckle, black twin-berry
Lonicera japonicaJapanese honeysuckle
Distribution: Occasionally escaped from cultivation in lowland western Washington; California east through the midwestern, southeastern, and northeastern U.S.
Habitat: Disturbed areas, woods, and thickets.
Origin: Introduced
Flowers: May-July
Lonicera maackiiAmur honeysuckle
Origin: Introduced
Lonicera periclymenumwoodbine
Distribution: Occurring west of the Cascades crest in lowland western Washington; western Washington to California, also in scattered locations in northeastern North America.
Habitat: Roadsides, forest edge, fields, wastelots, and other disturbed areas at low elevations.
Origin: Introduced from Eurasia
Flowers: May-July
Lonicera pileata
Origin: Introduced
Lonicera tataricaTartarian honeysuckle
Distribution: Scattered localities throughout Washington; throughout much of North America except the southeastern U.S.
Habitat: Disturbed areas, woods, and thickets.
Origin: Introduced from Eurasia
Flowers: May-July
Lonicera utahensisRocky Mountain honeysuckle, Utah honeysuckle
Distribution: Both sides of the Cascades in Washington; British Columbia to Oregon, east to Montana and south in the Rockies to Arizona.
Habitat: Mid- to high elevations in the mountains.
Origin: Native
Flowers: May-July
Lonicera xylosteumEuropean fly honeysuckle
Origin: Introduced
Lotus corniculatusbird's-foot trefoil, garden bird's-foot trefoil
Distribution: Occurring on both sides of the Cascades crest in Washington; widely distributed throughout most of North America.
Habitat: Open, mesic to wet areas, typically where disturbed.
Origin: Introduced
Flowers: May-September
Lotus tenuisnarrowleaf bird's-foot trefoil, narrowleaf trefoil, slender trefoil
Distribution: Occurring in scattered locations on both sides of the Cascades crest in Washington; British Columbia to California, east to the Great Plains, also in eastern North America.
Habitat: Fields, roadsides, wastelots, and other disturbed areas
Origin: Introduced from Eurasia
Flowers: May-July
Lotus uliginosuslarge bird's-foot trefoil, big lotus, big trefoil
Distribution: Occurring west of the Cascades crest in Washington; British Columbia to California, east to Idaho; east across Canada to Nova Scotia; scattered localities in eastern U.S.
Habitat: Moist to wet disturbed areas, roadsides, abandoned lots, and coastal tidelands.
Origin: Introduced from Europe
Flowers: May-July
Ludwigia hexapetalafalse loosestrife, water primrose
Distribution: Scattered locations throughout Washington; along Columbia River near Portland, OR, introduced in much of North America.
Habitat: Swamps, lakes, and streams.
Origin: Introduced from South America
Flowers: June-August
Ludwigia palustrismarsh primrose-willow, water purslane
Distribution: Occurring west of the Cascades crest and along the Columbia River in Washington; southern British Columbia to California, east to Idaho, east across the southwestern U.S. and southern Great Plains to eastern North America; also occurring in New World Tropics and Eurasia.
Habitat: Lakes, marshes, peatlands, shores, and wet meadows.
Origin: Native
Flowers: July-September
Ludwigia peploidesfloating primrose-willow
Distribution: Documented west of the Cascades crest in King County in Washington; central Oregon to California, east across the southwestern U.S. and southern Great Plains to eastern North America.
Habitat: Noxious; ponds, slow streams, and sloughs.
Origin: Introduced
Flowers: June-September
ssp. montevidensis – floating primrose-willow
Luetkea pectinatalutkea, partridgefoot
Distribution: Occurring in the Olympics and Cascades mountains in Washington; Alaska south to California, and in the Rocky Mountains.
Habitat: Usually on sandy soil in moist or shady places, subalpine to alpine.
Origin: Native
Flowers: June-August
Luina hypoleucalittleleaf luina, silverback luina, littleleaf silverback
Distribution: Occurring on both sides of the Cascades crest and in the Olympic Mountains in Washington; British Columbia to California.
Habitat: Open, rocky areas, from moist to somewhat dry, at middle to high elevations in the mountains.
Origin: Native
Flowers: June-October
Lunaria annuahonesty, money plant
Distribution: Distributed in scattered locations across Washington; British Columbia south to California and Utah; also distributed throughout eastern North America.
Habitat: Escaping from cultivation to urban forests, roadsides, and other disturbed areas.
Origin: Introduced from southeast Europe
Flowers: March-June
Lupinus albicaulissicklekeel lupine
Distribution: Occurring west of the Cascades crest in Washington; Washington to California, and in western Nevada.
Habitat: Lowland prairies, grasslands, meadows, and open areas.
Origin: Native
Flowers: May-July
Lupinus arboreustree lupine, yellow bush lupine
Distribution: Occurring west of the Cascades crest in Washington in the lowlands and along the Pacific coast; British Columbia to California.
Habitat: Sandy soil at low elevations, often where disturbed.
Origin: Introduced from California, where native
Flowers: May-September
Lupinus arbustuslongspur lupine, spurred lupine
Distribution: Occurring east of the Cascades crest in Washington; British Columbia to California, east to Montana and Utah.
Habitat: Sagebrush deserts and ponderosa pine forest openings.
Origin: Native
Flowers: May-July
Lupinus argenteussilvery lupine
Distribution: Occurring east of the Cascades crest in Washington; British Columbia to California, east to the Rocky Mountains and Great Plains.
Habitat: Sagebrush plains, and ponderosa pine forests to subalpine ridges.
Origin: Native
Flowers: May-July
var. argenteus – silvery lupine
Lupinus bicolorfield lupine, small-flowered lupine, two-color lupine
Distribution: Occurring chiefly west of the Cascades crest in Washington, but also in the southeastern part of state; British Columbia to California, east to Arizona.
Habitat: Open meadows, grasslands, prairies, and sandy riverbanks at low to moderate elevations.
Origin: Native
Flowers: April-July
Lupinus latifoliusbroadleaf lupine
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California.
Habitat: Lowland prairies to subalpine meadows and alpine ridges.
Origin: Native
Flowers: June-August
var. latifolius – broadleaf lupine
var. subalpinus – broadleaf lupine
Lupinus lepidusprairie lupine
Distribution: Widely distributed on both sides of the Cascades crest in Washington; Alaska to California, east to the Rocky Mountains.
Habitat: Open areas from lowland prairies and sagebrush flats to alpine ridges.
Origin: Native
Flowers: June-August
var. aridus – prairie lupine
var. lepidus – Pacific lupine
var. lobbii – elegant lupine
var. utahensis – prairie lupine
Lupinus leucophyllusvelvet lupine
Distribution: Occurring east of the Cascades crest in Washington; British Columbia to California, east to Montana, Wyoming, and Utah.
Habitat: Sagebrush plains, grasslands, and ponderosa pine forest openings.
Origin: Native
Flowers: June-August
var. leucophyllus – velvet lupine
var. tenuispicus – velvet lupine
Lupinus littoralisseashore lupine
Distribution: Occurring in the coastal counties in Washington; along the immediate coast from British Columbia to California.
Habitat: Immediate coastline in dunes and on beaches.
Origin: Native
Flowers: May-August
var. littoralis – seashore lupine
Lupinus microcarpuschick lupine
Distribution: Occurring chiefly west of the Cascades in Washington; British Columbia to California.
Habitat: Coastal bluffs, grassy balds, and other dry to moist, open areas at low elevations.
Origin: Native
Flowers: April-June
var. microcarpus – chick lupine
Lupinus nootkatensisNootka lupine
Distribution: Reported from northwest area of Washington; Alaska and Yukon Territory to Vancouver Island, British Columbia.
Habitat: Mesic meadows, stream banks, thickets, and forest openings.
Origin: Introduced from British Columbia
Flowers: May-June
Lupinus oreganusKincaid's lupine, Oregon lupine
Distribution: Occurring west of the Cascades crest in southwestern Washington; southwestern Washington to the Willamette Valley in Oregon, also known historically from Vancouver Island.
Habitat: Moist to dry areas of prairies and openings in oak woodlands.
Origin: Native
Flowers: April-June
var. kincaidii – Kincaid's lupine, Oregon lupine
Lupinus pachylobusbig-pod lupine
Distribution: Occurring in San Juan County in Washington; disjunct in the Gulf Islands of Canada and San Juan Islands of Washington, otherwise in California.
Habitat: Rocky balds and dry slopes
Origin: Native?
Flowers: April-June
Lupinus polyphyllusbigleaf lupine, large-leaved lupine
Distribution: Widely distributed throughout Washington; British Columbia to California, east to Colorado.
Habitat: Moist areas and stream banks, lowlands to subalpine and alpine areas.
Origin: Native
Flowers: June-September
var. burkei – large-leaved lupine, many-leaved lupine
var. humicola – Wyeth's lupine
var. pallidipes – large-leaved lupine
var. polyphyllus – large-leaved lupine
var. prunophilus – large-leaved lupine
Lupinus pusilluslow lupine, rusty lupine
Distribution: Occurring east of the Cascades crest in south-central Washington; Washington to California, east to the Rocky Mountains and Great Plains.
Habitat: Sagebrush desert, often where sandy.
Origin: Native
Flowers: May-June
var. intermontanus – low lupine, rusty lupine
Lupinus rivularisriver bank lupine, stream bank lupine
Distribution: Occurring west of the Cascades crest in Washington; British Columbia to California.
Habitat: Gravelly prairies, open woods and riverbanks at low elevations.
Origin: Native
Flowers: April-September
Lupinus sabinianusSabin's lupine
Distribution: Occurring in the Blue Mountains of southeastern Washington; southeastern Washington to adjacent northeastern Oregon.
Habitat: Ponderosa pine forest openings and grasslands at low to moderate elevations.
Origin: Native
Flowers: May-June
Lupinus saxosusrock lupine
Distribution: Occurring east of the Cascades crest in Washington; Washington to California, east to Idaho and Nevada.
Habitat: Mostly on basaltic rimrock in sagebrush desert or pine woodland.
Origin: Native
Flowers: April-May
Lupinus sericeussilky lupine
Distribution: Occurring east of the Cascades crest in Washington; British Columbia to Oregon, east to Alberta and Rocky Mountains.
Habitat: Sagebrush deserts to forest openings at moderate elevations.
Origin: Native
Flowers: May-August
var. asotinensis – Asotin silk lupine
var. sericeus – silky lupine
Lupinus sulphureussulfur lupine
Distribution: Occurring east of the Cascades crest in Washington; southern British Columbia to central Oregon, possibly east to adjacent Idaho.
Habitat: Shrub-steppe, grassland, and open ponderosa pine forests.
Origin: Native
Flowers: April-June
var. sulphureus – sulphur lupine
Luzula arcuatacurved woodrush
Distribution: Alaska, British Columbia, and Mt. Rainier, Washington.
Habitat: Rocky or gravelly soil, usually on moraines or above timberline.
Origin: Native
Flowers: July - August
ssp. unalaschcensis – curved woodrush
Luzula campestrisfield woodrush
Origin: Introduced
ssp. campestris – field woodrush
Luzula cascadensisCascades woodrush
Origin: Native
Luzula comosa
Distribution: Uncommon west of the Cascades, British Columbia to California
Habitat: Gravelly prairies to moist, shaded areas in the lowlands
Origin: Native
Flowers: April - July
var. comosa – pale woodrush
var. laxa – Pacific woodrush
Luzula forsterisouthern woodrush
Origin: Introduced
ssp. forsteri – southern woodrush
Luzula hitchcockiiHitchcock's woodrush, smooth woodrush
Distribution: Occurring on both sides of the Cascades crest in Washington; southern British Columbia south to Crater Lake and the Wallowa Mountains of Oregon, east to Alberta, Idaho and Montana.
Habitat: Montane forests to alpine slopes, ridges and meadows.
Origin: Native
Flowers: July-September
Luzula macranthalarge-anthered woodrush, prairie woodrush
Distribution: Occurring chiefly west of the Cascades crest and in the Columbia River Gorge in Washington; British Columbia to California
Habitat: Balds, prairies, grasslands, and forest openings at low to moderate elevations.
Origin: Native
Flowers: April-June
Luzula multifloracommon woodrush
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska south to Oregon, east to Alberta and western Montana; also in northeastern United States.
Habitat: Fields, meadows, open woods and clearings, at low to moderate elevations in the mountains.
Origin: Native
Flowers: May-July
Luzula niveasnowy woodrush
Origin: Introduced from Europe
Luzula parviflorasmall flowered woodrush
Distribution: Alaska to Newfoundland, south to southern California and New York.
Habitat: Moist to fairly dry areas, coastal rain forest to alpine slopes.
Origin: Native
Flowers: May - August
Luzula piperiPiper's woodrush
Origin: Native
Luzula spicataspiked woodrush
Origin: Native
ssp. spicata – spiked woodrush
Luzula subsessilisshort-stalked wood-rush
Origin: Native
Luzula sylvaticagreat woodrush
Origin: Introduced
Lychnis coronariarose campion
Distribution: Occurring chiefly west of the Cascades crest in Washington; British Columbia south to California, east to Idaho and Utah; eastern North America.
Habitat: Along roadways, railways and waste land.
Origin: Introduced
Flowers: June-August
Lycium barbarummatrimony-vine
Distribution: Chiefly east of the Cascades in Washington; widely distributed throughout North America.
Habitat: Disturbed ground.
Origin: Introduced from Eurasia
Flowers: June-September
Lycium chinenseChinese wolfberry
Origin: Introduced
Lycopodiella inundatabog clubmoss, marsh clubmoss, northern bog clubmoss
Distribution: Occurring west of the Cascades crest in Washington; Alaska south to California; in scattered locations in north central Canada; from Minnesota and Ontarioa east to the Atlantic Coast.
Habitat: Wet areas, pond and lakeshores from low to middle elevations in the mountains.
Origin: Native
Lycopodium clavatumcommon clubmoss, elk-moss
Distribution: Occurring chiefly west of the Cascades crest in Washington; British Columbia to California, east to Montana, also in central and eastern North America; circumboreal
Habitat: Moist coniferous woods and swamps.
Origin: Native
Spores: Produces spores April-October
Lycopodium lagopusone-cone clubmoss, ptarmigan clubmoss
Distribution: Occurring in the North Cascades in Washington; Alaska to northern Washington, western Montana, the Great Lakes region, and northeastern North America.
Habitat: Moist, open areas, montane to subalpine.
Origin: Native
Lycopsis arvensisannual bugloss, European bugloss, small bugloss
Origin: Introduced from Europe
Lycopus americanuscut-leaf water-horehound
Distribution: Both sides of the Cascades in Washington; throughout most of North America.
Habitat: Nonalkaline wetland, riparian, pond and lakeshore sites at low to moderate elevations.
Origin: Native
Flowers: June-August
Lycopus asperrough water-horehound
Distribution: Chiefly east of the Cascades; southern British Columbia to California, east to Colorado and Minnisota.
Habitat: Marshes and shores of streams and lakes; tolerant of alkali.
Origin: Native
Flowers: June-August
Lycopus europaeusEuropean water-horehound
Origin: Introduced from Europe
Lycopus uniflorusnorthern bugleweed
Distribution: Both sides of the Cascades in Washington; Alaska to Newfoundland, south to northwest California and North Carolina.
Habitat: Stream banks, marshes and peat bogs, mostly in the mountains, but descending to sea level west of the Cascades.
Origin: Native
Flowers: July-September
Lygodesmia juncearush skeletonplant
Distribution: Known from Spokane County in Washington; southeastern British Columbia to eastern Washington, Idaho and Nevada, east to Great Plains and Great Lakes region.
Habitat: Dry, open places, often in sandy soil, from low to middle elevations.
Origin: Native
Flowers: June-September
Lysichiton americanusskunk cabbage, yellow skunk cabbage
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east to northern Idaho and western Montana.
Habitat: Marshes, swamps, and forested wetlands from sea level to middle elevations in the mountains.
Origin: Native
Flowers: March-July
Lysimachia arvensisscarlet pimpernel
Distribution: Occurring in scattered locations on both sides of the Cascades crest in Washington; British Columbia to California, east across much of North America to the Atlantic Coast.
Habitat: Roadsides, fields, wastelots, and other disturbed, open areas.
Origin: Introduced from Eurasia
Flowers: May-June
Lysimachia ciliatafringed yellow-loosestrife
Distribution: Occurring chiefly east of the Cascades crest in Washington; British Columbia to Oregon, east across most of North America to the Atlantic Coast.
Habitat: Riparian zones, wet meadows, marshes, shores, springs, and moist forest.
Origin: Native
Flowers: June-August
Lysimachia europaeaarctic starflower, northern starflower
Distribution: Both side of the Cascades in Washington; Alaska south to California, east to Alberta and Idaho.
Habitat: Bogs and swamps, low to mid-elevations in the mountains.
Origin: Native
Flowers: May-August
Lysimachia hybridalance-leaved yellow loosestrife, lowland loosestrife, Mississippi loosestrife, lowland yellow-loosestrife
Origin: Introduced
Lysimachia latifoliabroad-leaved starflower, western starflower
Distribution: Occurring on both sides of the Cascades crest in Washington; southern British Columbia to California, east to northern Idaho.
Habitat: Prairies, woodlands, and forest openings from low to middle elevations in the mountains.
Origin: Native
Flowers: April-July
Lysimachia maritimasea milkwort, sea-milkwort
Distribution: Chiefly west of the Cascades in Washington; circumboreal; Alaska to California, east to Newfoundland, south in eastern North America to Virginia.
Habitat: Coastal tideflats and saline areas.
Origin: Native
Flowers: April-June
Lysimachia minimachaffweed
Distribution: Chiefly east of the Cascades in Washington, though also found near the coast; throughout much of North America.
Habitat: Moist ground and vernal pools at low elevations.
Origin: Native
Flowers: May-June
Lysimachia nummulariacreeping-Jenny
Distribution: Scattered locations west of the Cascades in Washington; British Columbia south to California and Nevada; occurring in central U.S and eastern North America.
Habitat: Moist, disturbed ground along lakes, ponds, roadsides and near gardens.
Origin: Introduced
Flowers: June-August
Lysimachia punctatalarge yellow-loosestrife
Distribution: Scattered localities across Washington; British Columbia south Oregon, east to Montana; scattered throughout central and eastern North America.
Habitat: Old fields, roadsides and stream banks.
Origin: Introduced
Flowers: July-August
Lysimachia terrestrisswampcandles
Distribution: Along the coast in Washington; British Columbia south to Oregon and Idaho; native and abundant in central and eastern North America.
Habitat: Cultivated cranberry bogs, and swamps.
Origin: Introduced from eastern North America
Flowers: June-August
Lysimachia thyrsifloratufted yellow-loosestrife
Distribution: Distributed on both sides of the Cascades in Washington; Alaska south to California, eastern North America.
Habitat: Swamps, lakes and ditches.
Origin: Native
Flowers: May-July
Lysimachia vulgarisgarden yellow-loosestrife
Distribution: Occurring in scattered localities on both sides of the Cascades in Washington; British Columbia to Oregon, east to Montana; widely distributed in eastern North America.
Habitat: Uncommon garden escape of moist areas, lake and pond margins, and riparian zones.
Origin: Introduced from Europe
Flowers: June-August
Lythrum hyssopifoliahyssop loosestrife
Distribution: Scattered locations on both sides of the Cascades in Washington; British Columbia south to California; eastern North America.
Habitat: Moist, disturbed areas.
Origin: Introduced
Flowers: May-September
Lythrum portulaspatula-leaf loosestrife
Distribution: Chiefly west of the Cascades in Washington; British Columbia south to California.
Habitat: Wetlands, disturbed moist areas.
Origin: Introduced
Flowers: June-September
Lythrum salicariapurple loosestrife, long purples
Distribution: Widely distributed throughout Washington; widely distributed throughout North America.
Habitat: Noxious weed of standing water and wet ground.
Origin: Introduced from Europe
Flowers: July-September