Vascular Plants

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

Browse by common 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
Common names beginning with H:
Netleaf hackberry (Celtis reticulata)
Distribution: Primarily along the Columbia River and Snake River in Washington; Washington south to California, east through Southern Rockies to Kansas, Oklahoma and Texas.
Habitat: Open slopes and rocky bluffs.
Origin: Native
Flowers: April-May
Beringian hairgrass (Deschampsia cespitosa)
Distribution: Widely distributed throughout Washington; widely distributed throughout North America.
Habitat: From coastal marshes and moist prairies to alpine ridges, talus slopes, mountain meadows, and moist areas in the mountains in general.
Origin: Native
Flowers: June-September
Delicate hairgrass (Aira elegans)
Origin: Introduced
Silver hairgrass (Aira caryophyllea)
Distribution: Occurring west of the Cascades crest in Washington and east in the Columbia River Gorge; British Columbia to California, east to Idaho and Wyoming, also in the southeastern U.S. and northeastern North America.
Habitat: Balds, prairies, meadows, forest openings, roadsides, wastelots, and other open areas at low to middle elevations.
Origin: Introduced Eurasia and North Africa
Flowers: May-August
Tufted hairgrass (Deschampsia cespitosa)
Distribution: Widely distributed throughout Washington; widely distributed throughout North America.
Habitat: From coastal marshes and moist prairies to alpine ridges, talus slopes, mountain meadows, and moist areas in the mountains in general.
Origin: Native
Flowers: June-September
Puzzling halimolobos (Sandbergia perplexa)
Distribution: Known from Douglas County in Washington; Washington east toIdaho and Montana.
Habitat: Sagebrush desert, typically on lithosol.
Origin: Native
Flowers: April-June
Halogeton (Halogeton glomeratus)
Origin: Introduced from Eurasia
Flowers: July - September
Hardheads (Rhaponticum repens)
Distribution: Occurring east of the Cascades crest in Washington; British Columbia to California, east across most of North America to the Atlantic Coast.
Habitat: Disturbed dry slopes, meadows, fields, forest openings, and other disturbed, open places from low to middle elevations.
Origin: Introduced from central Asia
Flowers: June-September
Alaska harebell (Campanula lasiocarpa)
Distribution: Local in Washington to western Cascades of Puget Trough; Alaska south to Washington, east to Northwest Territories and Alberta.
Habitat: Uncommon in meadows at high elevations in the mountains
Origin: Native
Flowers: July-August
Parry's harebell (Campanula parryi)
Distribution: Local in Olympic and Cascade Mountains of Washington; central and northern Idaho and adjacent Montana.
Habitat: High elevations in the mountains.
Origin: Native
Flowers: July-August
Rough harebell (Campanula scabrella)
Distribution: In the Cascades of Washington; Washington south to California, east to Idaho and Montana.
Habitat: Open, rocky areas at high elevations.
Origin: Native
Flowers: June-August
Rover harebell (Campanula rapunculoides)
Distribution: Introduced garden species, often escaping in scattered localities across Washington; British Columbia to Oregon.
Habitat: Moist soil at low elevations
Origin: Introduced
Flowers: June-August
Slender hareleaf (Lagophylla ramosissima)
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
Autumn hawkbit (Leontodon autumnalis)
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
Hairy hawkbit (Leontodon saxatilis)
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
Annual hawksbeard (Crepis tectorum)
Distribution: Occurring in scattered locations on both sides of the Cascades crest in Washington; Alaska to California, east across the northern regions of the U.S. and Canada to the Atlantic Coast.
Habitat: Roadsides, fields, ditches, wastelots, and other disturbed, open areas.
Origin: Introduced from Europe
Flowers: June-August
Baker's hawksbeard (Crepis bakeri)
Distribution: Occurring east of the Cascades crest in central Washington; central Washington to California.
Habitat: Dry slopes, sagebrush, and forest openings from the foothills to middle elevations in the mountains.
Origin: Native
Flowers: May-July
Bearded hawksbeard (Crepis barbigera)
Distribution: Occurring east of the Cascades crest in Washington; Washington to Oregon, east to Idaho.
Habitat: Sagebrush deserts to ponderosa pine forest openings at middle elevations.
Origin: Native
Flowers: May-July
Bristly hawksbeard (Crepis setosa)
Distribution: Occurring west of the Cascades crest in southwestern Washington; southwestern British Columbia to California, also in Montana and eastern U.S.
Habitat: Roadsides, fields, ditches, wastelots, and other disturbed open areas at low elevations.
Origin: Introduced
Flowers: June-August
Dandelion hawksbeard (Crepis runcinata)
Distribution: Occurring east of the Cascades crest in Washington; southeastern British Columbia to California, east to the Great Plains.
Habitat: Moist to dry meadows, marshes, seeps, shores, riverbanks, often where alkaline, from the lowlands to middle elevations in the mountains.
Origin: Native
Flowers: May-July
French hawksbeard (Crepis nicaeensis)
Distribution: Occurring in scattered locations on both sides of the Cascades crest in Washington; southwestern British Columbia to southwestern Oregon, also in western Montana, the Great Lakes region, and northeastern North America.
Habitat: Roadsides, fields, pastures, forest openings, and other disturbed areas, often where at least seasonally moist.
Origin: Introduced from Europe
Flowers: June-August
Gray hawksbeard (Crepis intermedia)
Distribution: Occurring east of the Cascades crest in Washington; British Columbia to California, east to the Rocky Mountains.
Habitat: Open forest, grassland, meadows, rocky or sandy slopes, and ridges from low to middle elevations in the mountains.
Origin: Native
Flowers: May-July
Intermediate hawksbeard (Crepis intermedia)
Distribution: Occurring east of the Cascades crest in Washington; British Columbia to California, east to the Rocky Mountains.
Habitat: Open forest, grassland, meadows, rocky or sandy slopes, and ridges from low to middle elevations in the mountains.
Origin: Native
Flowers: May-July
Limestone hawksbeard (Crepis intermedia)
Distribution: Occurring east of the Cascades crest in Washington; British Columbia to California, east to the Rocky Mountains.
Habitat: Open forest, grassland, meadows, rocky or sandy slopes, and ridges from low to middle elevations in the mountains.
Origin: Native
Flowers: May-July
Long-leaved hawksbeard (Crepis acuminata)
Distribution: Occurring east of the Cascades crest in Washington; British Columbia to California, east to the Rocky Mountains and northern Great Plains.
Habitat: Dry slopes and forest openings from the foothiils to middle elevations in the mountains.
Origin: Native
Flowers: May-July
Low hawksbeard (Askellia pygmaea)
Distribution: Occurring in the Olympic and Cascades mountains in Washington; Alaska to California, east to Nunavut and Colorado, also in northeastern Canada; Asia.
Habitat: Talus, scree, moraines, sandy or gravelly slopes, subalpine to alpine.
Origin: Native
Flowers: July-September
Low hawksbeard (Crepis modocensis)
Distribution: Occurring east of the Cascades crest in Washington; central British Columbia to California, east to Montana, Wyoming, and Colorado.
Habitat: Common in shrub-steppe, sagebrush, and conifer forest openings.
Origin: Native
Flowers: May-July
Meadow hawksbeard (Crepis runcinata)
Distribution: Occurring east of the Cascades crest in Washington; southeastern British Columbia to California, east to the Great Plains.
Habitat: Moist to dry meadows, marshes, seeps, shores, riverbanks, often where alkaline, from the lowlands to middle elevations in the mountains.
Origin: Native
Flowers: May-July
Modoc hawksbeard (Crepis modocensis)
Distribution: Occurring east of the Cascades crest in Washington; central British Columbia to California, east to Montana, Wyoming, and Colorado.
Habitat: Common in shrub-steppe, sagebrush, and conifer forest openings.
Origin: Native
Flowers: May-July
Narrow leaf hawksbeard (Crepis tectorum)
Distribution: Occurring in scattered locations on both sides of the Cascades crest in Washington; Alaska to California, east across the northern regions of the U.S. and Canada to the Atlantic Coast.
Habitat: Roadsides, fields, ditches, wastelots, and other disturbed, open areas.
Origin: Introduced from Europe
Flowers: June-August
Rooftop hawksbeard (Crepis tectorum)
Distribution: Occurring in scattered locations on both sides of the Cascades crest in Washington; Alaska to California, east across the northern regions of the U.S. and Canada to the Atlantic Coast.
Habitat: Roadsides, fields, ditches, wastelots, and other disturbed, open areas.
Origin: Introduced from Europe
Flowers: June-August
Rough hawksbeard (Crepis setosa)
Distribution: Occurring west of the Cascades crest in southwestern Washington; southwestern British Columbia to California, also in Montana and eastern U.S.
Habitat: Roadsides, fields, ditches, wastelots, and other disturbed open areas at low elevations.
Origin: Introduced
Flowers: June-August
Slender hawksbeard (Crepis atribarba)
Distribution: Occurring east of the Cascades crest in Washington; British Columbia to Nevada, east to the Rocky Mountains and northern Great Plains.
Habitat: Dry slopes, sagebrush, and forest openings from foothills to middle elevations in the mountains.
Origin: Native
Flowers: May-July
Smooth hawksbeard (Crepis capillaris)
Distribution: Occurring chiefly west of the Cascades crest and east in the Columbia River Gorge in Washington; Alaska to California, east across most of North America to the Atlantic Coast.
Habitat: Roadsides, fields, ditches, wastelots, and other disturbed, open areas at low elevation.
Origin: Introduced from Europe
Flowers: May-November
Tapertip hawksbeard (Crepis acuminata)
Distribution: Occurring east of the Cascades crest in Washington; British Columbia to California, east to the Rocky Mountains and northern Great Plains.
Habitat: Dry slopes and forest openings from the foothiils to middle elevations in the mountains.
Origin: Native
Flowers: May-July
Turkish hawksbeard (Crepis nicaeensis)
Distribution: Occurring in scattered locations on both sides of the Cascades crest in Washington; southwestern British Columbia to southwestern Oregon, also in western Montana, the Great Lakes region, and northeastern North America.
Habitat: Roadsides, fields, pastures, forest openings, and other disturbed areas, often where at least seasonally moist.
Origin: Introduced from Europe
Flowers: June-August
Western hawksbeard (Crepis occidentalis)
Distribution: Occurring chiefly east of the Cascades crest in Washington; central British Columbia to California, east to the Rocky Mountains and northern Great Plains of Canada and the U.S.
Habitat: Dry, open places, mostly in the foothills and plains, but also found in the subalpine.
Origin: Native
Flowers: May-July
Alpine hawkweed (Hieracium triste)
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east to the Rocky Mountains of Canada and the U.S.
Habitat: Meadows and other open places in the mountains, usually at high elevations.
Origin: Native
Flowers: June-August
Common hawkweed (Hieracium lachenalii)
Distribution: Occurring west of the Cascades crest in Washington; British Columbia to northern Oregon; also in eastern North America.
Habitat: Open forest, fields, shores, wastelots, and other disturbed areas generally at low to middle elevations.
Origin: Introduced from Europe
Flowers: June-August
English hawkweed (Hieracium lachenalii)
Distribution: Occurring west of the Cascades crest in Washington; British Columbia to northern Oregon; also in eastern North America.
Habitat: Open forest, fields, shores, wastelots, and other disturbed areas generally at low to middle elevations.
Origin: Introduced from Europe
Flowers: June-August
European hawkweed (Hieracium lachenalii)
Distribution: Occurring west of the Cascades crest in Washington; British Columbia to northern Oregon; also in eastern North America.
Habitat: Open forest, fields, shores, wastelots, and other disturbed areas generally at low to middle elevations.
Origin: Introduced from Europe
Flowers: June-August
Flowery hawkweed (Hieracium ×floribundum)
Distribution: Occurring in scattered locations in lowland western Washington; Washington east to Montana and Wyoming; eastern North America.
Habitat: Disturbed areas at low elevations.
Origin: Introduced
Flowers: May-July
Forked hawkweed (Hieracium ×stoloniflorum)
Distribution: Occurring in scattered locations on both sides of the Cascades crest in Washington; no other reports from North America.
Habitat: Lawns, roadsides, ditches, and other disturbed areas, where escaping from cultivation.
Origin: Introduced from Europe
Flowers: June-August
Hound-tongue hawkweed (Hieracium scouleri)
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to California, east to Alberta, Montana, Wyoming, and Utah.
Habitat: Mostly dry places in open woods, from foothills to middle elevations in the mountains.
Origin: Native
Flowers: June-August
Long-bearded hawkweed (Hieracium longiberbe)
Distribution: Occurring in the Columbia River Gorge in Washington; south-central Washington to adjacent north-central Oregon; endemic to the Columbia River Gorge.
Habitat: Dry rocky slopes and ledges.
Origin: Native
Flowers: June-July
Meadow hawkweed (Hieracium caespitosum)
Distribution: Widely distributed on both sides of the Cascades crest in Washington; British Columbia to Oregon, east to Idaho, Montana, and Wyoming; also occurring throughout eastern North America.
Habitat: Moist pastures, forest openings, roadsides, and springs, from the lowlands to middle elevations in the mountains, usually where disturbed.
Origin: Introduced from Europe
Flowers: June-August
Mottled hawkweed (Hieracium maculatum)
Distribution: Occurring west of the Cascades crest in lowland western Washington; southwestern British Columbia to western Washington.
Habitat: Lawns, railroads, wastelots, and other disturbed areas at low elevations.
Origin: Introduced from Europe
Flowers: June-August
Mouse-ear hawkweed (Hieracium pilosella)
Distribution: Occurring chiefly west of the Cascades crest in Washington; British Columbia to Oregon; also in northeastern North America.
Habitat: Roadsides, dry prairies, quarries, lawns, railroads, and other disturbed sites.
Origin: Introduced from Europe
Flowers: June-August
Narrowleaf hawkweed (Hieracium umbellatum)
Distribution: Occurring east of the Cascades crest and in the Columbia River Gorge in Washington; Alaska to northwestern Oregon, east across the northern half of North America to the Atlantic Coast; circumboreal.
Habitat: Moist places in thickets and open woods.
Origin: Native
Flowers: July-September
Orange hawkweed (Hieracium aurantiacum)
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to California, east across southern Canada and northern U.S; widely distributed throughout eastern U.S.
Habitat: Roadsides, fields, meadows, pastures, forest edge, wastelots, and other disturbed areas at low to middle elevations.
Origin: Introduced from Europe
Flowers: June-August
Savoy hawkweed (Hieracium sabaudum)
Distribution: Occurring west of the Cascades crest in Washington; southern British Columbia to Washington; also in eastern North America.
Habitat: Roadsides, sandy fields, and other disturbed areas.
Origin: Introduced from Europe
Flowers: June-August
Scouler's hawkweed (Hieracium scouleri)
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to California, east to Alberta, Montana, Wyoming, and Utah.
Habitat: Mostly dry places in open woods, from foothills to middle elevations in the mountains.
Origin: Native
Flowers: June-August
Slender hawkweed (Hieracium triste)
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east to the Rocky Mountains of Canada and the U.S.
Habitat: Meadows and other open places in the mountains, usually at high elevations.
Origin: Native
Flowers: June-August
Tall hawkweed (Hieracium piloselloides)
Distribution: Occurring west of the Cascades crest in Washington; British Columbia to northeastern Oregon.
Habitat: Roadsides, meadows, forest openings, and other disturbed areas.
Origin: Introduced from Europe
Flowers: June-August
Umbellate hawkweed (Hieracium umbellatum)
Distribution: Occurring east of the Cascades crest and in the Columbia River Gorge in Washington; Alaska to northwestern Oregon, east across the northern half of North America to the Atlantic Coast; circumboreal.
Habitat: Moist places in thickets and open woods.
Origin: Native
Flowers: July-September
Wall hawkweed (Hieracium murorum)
Distribution: Occurring in scattered locations west of the Cascades crest in Washington; southern British Columbia to northern Oregon.
Habitat: Roadsides, open forest, railroads, and other disturbed areas.
Origin: Introduced from Europe
Flowers: April-June
Whip hawkweed (Hieracium flagellare)
Distribution: Occurring west of the Cascades crest in Washington; British Columbia to Washington, east to Idaho; also in eastern North America.
Habitat: Roadsides, dry meadows, railroads, and other disturbed, open areas at low elevations.
Origin: Introduced from Europe
Flowers: May-September
White hawkweed (Hieracium albiflorum)
Distribution: Widely distributed in forested areas on both sides of the Cascades crest in Washington; British Columbia to California, east to the Rocky Mountains, northern Great Plains, Great Lakes region, and eastern Canada.
Habitat: Open woods from low to middle elevations.
Origin: Native
Flowers: June-September
White-flowered hawkweed (Hieracium albiflorum)
Distribution: Widely distributed in forested areas on both sides of the Cascades crest in Washington; British Columbia to California, east to the Rocky Mountains, northern Great Plains, Great Lakes region, and eastern Canada.
Habitat: Open woods from low to middle elevations.
Origin: Native
Flowers: June-September
Yellow devil hawkweed (Hieracium glomeratum)
Distribution: Occurring chiefly east of the Cascades crest in Washington; British Columbia to Washington.
Habitat: Open forest, meadows, disturbed ground, roadsides, stream banks, and gravel pits generally at low elevations.
Origin: Introduced from Europe
Flowers: May-August
Black hawthorn (Crataegus douglasii)
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east to Saskatchewan, Idaho and Montana, also in the Great Lakes region.
Habitat: Thickets, open forests, forest edges, and riparian zones, from lowlands to middle elevations.
Origin: Native
Flowers: May-June
Castlegar hawthorn (Crataegus castlegarensis)
Origin: Native
Douglas's hawthorn (Crataegus douglasii)
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east to Saskatchewan, Idaho and Montana, also in the Great Lakes region.
Habitat: Thickets, open forests, forest edges, and riparian zones, from lowlands to middle elevations.
Origin: Native
Flowers: May-June
English hawthorn (Crataegus monogyna)
Distribution: Occurring chiefly west of the Cascades crest in Washington; southern British Columbia to California, east to Montana, also in the Great Lakes region and eastern North America.
Habitat: Roadsides, fields, pastures, meadows, thickets, and forest edge and understory at low elevations, often associated with disturbance. Seeds readily dispersed by birds.
Origin: Introduced from Europe
Flowers: April-June
Fireberry hawthorn (Crataegus chrysocarpa)
Distribution: Occurring east of the Cascades crest in Washington; British Columbia to Oregon, east to the Atlantic.
Habitat: Thickets, dry slopes, shrub-steppe, riparian zones, open forests.
Origin: Native
Flowers: May-June
Huckleberry hawthorn (Crataegus gaylussacia)
Distribution: Occurring on both sides of the Cascades crest in Washington; disjunct in southeast Alaska, otherwise southern British Columbia to California, east to Montana.
Habitat: Thickets, grasslands, riparian zones, shores, and meadows, from lowl to middle elevations in the mountains.
Origin: Native
Flowers: April-June
Large-thorned hawthorn (Crataegus macracantha)
Origin: Native
Midland hawthorn (Crataegus laevigata)
Origin: Introduced from northern Europe
O'Kennon's hawthorn (Crataegus okennonii)
Origin: Native
Okanagan hawthorn (Crataegus okanaganensis)
Origin: Native
One-seed hawthorn (Crataegus monogyna)
Distribution: Occurring chiefly west of the Cascades crest in Washington; southern British Columbia to California, east to Montana, also in the Great Lakes region and eastern North America.
Habitat: Roadsides, fields, pastures, meadows, thickets, and forest edge and understory at low elevations, often associated with disturbance. Seeds readily dispersed by birds.
Origin: Introduced from Europe
Flowers: April-June
Oregon hybrid hawthorn (Crataegus ×cogswellii)
Origin: Introduced
Phipps\\\' hawthorn (Crataegus phippsii)
Origin: Native
Suksdorf's hawthorn (Crataegus gaylussacia)
Distribution: Occurring on both sides of the Cascades crest in Washington; disjunct in southeast Alaska, otherwise southern British Columbia to California, east to Montana.
Habitat: Thickets, grasslands, riparian zones, shores, and meadows, from lowl to middle elevations in the mountains.
Origin: Native
Flowers: April-June
Western large-thorned hawthorn (Crataegus macracantha)
Origin: Native
Woodland hawthorn (Crataegus laevigata)
Origin: Introduced from northern Europe
Beaked hazelnut (Corylus cornuta)
Distribution: Widespread in North America from British Columbia to Newfoundland, south to California, Colorado, Missouri, Ohio, and Georgia. In WA on both sides of the Cascades, and in the eastern portion of the state.
Habitat: Forest edge and openings, thickets, and rocky slopes at low to middle elevations.
Origin: Native
Flowers: January - March
European hazelnut (Corylus avellana)
Distribution: Widely planted as an ornamental and occasionally naturalizing in western Washington lowlands; British Columbia south to Oregon.
Habitat: Abandoned plantings, roadsides, waste sites, forest edge.
Origin: Introduced
Flowers: January-April
Elephant's head (Pedicularis groenlandica)
Distribution: Alaska to California, east to Montana, Colorado and New Mexico
Habitat: Seeps, lake shores and other wet areas at mid- to high elevations in the mountains
Origin: Native
Flowers: June - August
Lion's heart (Lallemantia peltata)
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
Heartweed (Persicaria maculosa)
Distribution: Occurring throughout much of Washington; widely distributed throughout North America.
Habitat: A weedy species, usually on moist, cultivated or otherwise disturbed soil.
Origin: Introduced
Flowers: March-September
Common heath-grass (Danthonia decumbens)
Origin: Introduced from Europe
Flowers: July - September
Mountain heath-grass (Danthonia decumbens)
Origin: Introduced from Europe
Flowers: July - September
Alpine heather (Harrimanella stelleriana)
Distribution: Alaska to the high Cascades of Washington
Habitat: Rocky slopes and seeps, alpine to subalpine
Origin: Native
Flowers: July - August
American hedge-hyssop (Gratiola neglecta)
Distribution: Occurring on both sides of the Cascades crest in Washington; widely distributed throughout most of North America.
Habitat: In shallow water and on muddy shores, and in other wet places in the valleys and plains.
Origin: Native
Flowers: June-August
Bractless hedge-hyssop (Gratiola ebracteata)
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia south to California, east to western Montana.
Habitat: Shallow water and muddy shores, and in other wet places in the valleys and plains.
Origin: Native
Flowers: May-August
Clammy hedge-hyssop (Gratiola neglecta)
Distribution: Occurring on both sides of the Cascades crest in Washington; widely distributed throughout most of North America.
Habitat: In shallow water and on muddy shores, and in other wet places in the valleys and plains.
Origin: Native
Flowers: June-August
Cooley's hedge-nettle (Stachys cooleyae)
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California.
Habitat: Forest understory, openings, and margins from low to moderate elevations in the mountains; often where moist.
Origin: Native
Flowers: June-August
Field hedge-nettle (Stachys arvensis)
Distribution: West of the Cascades in Washington near Seattle and Bellingham; British Columbia south to California; Gulf Coast and northeastern U.S.
Habitat: Weed in disturbed areas.
Origin: Introduced
Flowers: April-June
Mexican hedge-nettle (Stachys mexicana)
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska south to California.
Habitat: Forest understory, openings, and margins, often where moist.
Origin: Native
Flowers: June-August
Rigid hedge-nettle (Stachys rigida)
Distribution: Scattered locations mostly west of the Cascades in Washington; south to California and adjacent Nevada.
Habitat: Stream banks and moist bottom lands, mostly at low elevations.
Origin: Native
Flowers: July-August
Swamp hedge-nettle (Stachys pilosa)
Distribution: Occurring chiefly east of the Cascades crest in Washington; widely distributed throughout most of North America except extreme southeastern U.S. and northeastern Canada.
Habitat: Swamps, marshes, wetlands and riparian areas.
Origin: Native
Flowers: June-August
Upright hedge-parsley (Torilis japonica)
Distribution: Occurring chiefly west of the Cascades crest in Washington; southwestern British Columbia to California, also in south-central and eastern North America.
Habitat: Forest understory and edge, thickets, fields, roadsides, wastelots, and other disturbed areas at low elevations.
Origin: Introduced
Flowers: April-July
California hedge-parsley (Yabea microcarpa)
Distribution: Occurring on both sides of the Cascades crest in Washington and in the Columbia River Gorge. British Columbia to Baja California, east to Idaho, Utah, and New Mexico.
Habitat: Along streams, open woodlands, and vernally moist slopes at low elevations.
Origin: Native
Flowers: April-June
False hedge-parsley (Yabea microcarpa)
Distribution: Occurring on both sides of the Cascades crest in Washington and in the Columbia River Gorge. British Columbia to Baja California, east to Idaho, Utah, and New Mexico.
Habitat: Along streams, open woodlands, and vernally moist slopes at low elevations.
Origin: Native
Flowers: April-June
Field hedge-parsley (Torilis arvensis)
Distribution: Occurring west of the Cascades crest and east in the Columbia River Gorge in Washington; British Columbia to California, east to Idaho and Nevada, widespread from the U.S. midwest to the Atlantic Coast.
Habitat: Roadsides, forest edge, thickets, fields, wastelots, and other disturbed areas.
Origin: Introduced from Eurasia
Flowers: July-September
Japanese hedge-parsley (Torilis japonica)
Distribution: Occurring chiefly west of the Cascades crest in Washington; southwestern British Columbia to California, also in south-central and eastern North America.
Habitat: Forest understory and edge, thickets, fields, roadsides, wastelots, and other disturbed areas at low elevations.
Origin: Introduced
Flowers: April-July
Indian hedgemustard (Sisymbrium orientale)
Origin: Introduced
Rocky Mountain helianthella (Helianthella uniflora)
Distribution: Occurring east of the Cascades crest in Washington; British Columbia to Oregon and Nevada, east to the Rocky Mountains.
Habitat: Dry, open woods and meadows from low to middle elevations.
Origin: Native
Flowers: May-July
Garden heliotrope (Valeriana officinalis)
Origin: Introduced from Europe
Salt heliotrope (Heliotropium curassavicum)
Distribution: East of the Cascades in Washington; British Columbia south to tropical America.
Habitat: Saline places at low evelevations, often in the beds of dried ponds.
Origin: Native
Flowers: June-September
Seaside heliotrope (Heliotropium curassavicum)
Distribution: East of the Cascades in Washington; British Columbia south to tropical America.
Habitat: Saline places at low evelevations, often in the beds of dried ponds.
Origin: Native
Flowers: June-September
Siskiyou wild hellebore (Veratrum insolitum)
Distribution: Benton County, Oregon, south into northern California.
Habitat: Open prairies to thickets, and forested or open rocky slopes.
Origin: Native
Flowers: July - September
Stinking hellebore (Helleborus foetidus)
Distribution: Currently only known from lowland western Washington.
Habitat: Disturbed sites near urban or suburban areas, where escaped from cultivation.
Origin: Introduced
Flowers: February-April
Broad-leaved helleborine (Epipactis helleborine)
Distribution: Occurring west of the Cascades crest in lowland areas in Washington; British Columbia to California, in scattered locations across North America to the Atlantic Coast, where more common.
Habitat: Moist to dry forest edge and understory, often where disturbed.
Origin: Introduced from Eurasia
Flowers: June-October
Garden helleborine (Epipactis helleborine)
Distribution: Occurring west of the Cascades crest in lowland areas in Washington; British Columbia to California, in scattered locations across North America to the Atlantic Coast, where more common.
Habitat: Moist to dry forest edge and understory, often where disturbed.
Origin: Introduced from Eurasia
Flowers: June-October
Giant helleborine (Epipactis gigantea)
Distribution: Occurring on both sides of the Cascades in Washington; British Columbia to Baja California, east to the Rocky Mountains and in scattered location in the Great Plains.
Habitat: Stream banks, lake margins, around springs and seeps, especially in thermal waters in otherwise desert regions.
Origin: Native
Flowers: April-July
Helleborine (Epipactis helleborine)
Distribution: Occurring west of the Cascades crest in lowland areas in Washington; British Columbia to California, in scattered locations across North America to the Atlantic Coast, where more common.
Habitat: Moist to dry forest edge and understory, often where disturbed.
Origin: Introduced from Eurasia
Flowers: June-October
Hellroot (Orobanche minor)
Distribution: Occurring in scattered locations west of the Cascades crest in Washington; Washington to Oregon, and reported from Idaho; also in Texas and along the East Coast of the U.S.
Habitat: Lawns, fields, pastures, forest edge, and other grassy areas at low elevations.
Origin: Introduced from Europe
Flowers: May-July
Policeman's helmet (Impatiens glandulifera)
Distribution: Introduced in western Washington and British Columbia
Habitat: Escaped from cultivation at low elevations
Origin: Introduced from Asia
Flowers: July - September
Mountain hemlock (Tsuga mertensiana)
Distribution: Alaska to california, east to Montana; in both Olympics and Cascades in Washington
Habitat: Mid- to high elevations in the mountains
Origin: Native
Cones: June - July
Western hemlock (Tsuga heterophylla)
Distribution: Occurring west of the Cascades crest and in the northeast counties in Washington; Alaska to California, also in southeastern British Columbia, northern Idaho and western Montana.
Habitat: Moist, deep forests from sea level to middle elevations in the mountains
Origin: Native
Cones: May-June
Pacific hemlock-parsley (Conioselinum pacificum)
Distribution: Occurring west of the Cascades crest along the marine coast in Washington; Alaska to California.
Habitat: Bluffs and rocky or sandy beaches along the seashore.
Origin: Native
Flowers: June-August
Hemp (Cannabis sativa)
Distribution: Introduced in much of the United States
Habitat: Illegal plantings in openings in the forests
Origin: Introduced
Flowers: June - September
Bifid hemp nettle (Galeopsis bifida)
Distribution: Known from Kittitas County in Washington; Alaska to Washington, east across north U.S. and Canada to Atlantic Coast.
Habitat: Disturbed areas, roadsides, and irrigation channels.
Origin: Introduced
Flowers: July-August
Common hemp nettle (Galeopsis tetrahit)
Distribution: Chiefly west of the Cascades in Washington; Alaska to Newfoundland, south to Central Plains and Mid-Atlantic states.
Habitat: Meadows and other moist places.
Origin: Introduced from Eurasia
Flowers: July-August
Fat hen (Atriplex prostrata)
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to California, in scattered location across Canada and the U.S. to the Atlantic Coast.
Habitat: Along the coast in saline soils, beaches, and strands; inland in alkaline soils.
Origin: Introduced from Eurasia
Flowers: June-September
Spotted hen-nettle (Lamium maculatum)
Distribution: Chiefly west of the Cascades in Washington; Alaska, Oregon, Idaho; eastern North America.
Habitat: Disturbed ground.
Origin: Introduced from Eurasia
Flowers: April - August
Black henbane (Hyoscyamus niger)
Distribution: Scattered localities on both sides of the Cascades in Washington; widely distributed throughout uNorth America from Alberta to Nevada, east to central and northeastern North America.
Habitat: Roadsides and waste places.
Origin: Introduced from Europe
Flowers: May-August
Henbit (Lamium purpureum)
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
Spotted henbit (Lamium maculatum)
Distribution: Chiefly west of the Cascades in Washington; Alaska, Oregon, Idaho; eastern North America.
Habitat: Disturbed ground.
Origin: Introduced from Eurasia
Flowers: April - August
Herb-bennet (Geum urbanum)
Distribution: In scattered locations on both sides of the Cascades crest in Washington; Washington south to Oregon and Utah; also occurring in northeastern U.S.
Habitat: Disturbed areas in including, roadsides, wastelots, and fields.
Origin: Introduced
Flowers: May-September
Herb-Robert (Geranium robertianum)
Distribution: Occurring west of the Cascades crest and in the Columbia River Gorge in Washington; Alaska to California, east to Montana, further east in Canada, the Great Lakes region, and eastern North America.
Habitat: Forest understory and forest edges, riparian zones, and other lowland areas with natural or man-made disturbances.
Origin: Introduced from Europe
Flowers: March-August
California hesperochiron (Hesperochiron californicus)
Distribution: Occurring east of the Cascades crest in Washington; Washington to California, east to western MT, WY, and UT.
Habitat: Mostly in more or less alkaline meadows and flats, in plains, foothills and valleys
Origin: Native
Flowers: April-June
Small hesperochiron (Hesperochiron pumilus)
Distribution: Occurring east of the Cascade crest in Washington; Washington to California, east to the Rocky Mountains.
Habitat: Meadows and moist, open slopes from the foothills to moderate elevations in the mountains.
Origin: Native
Flowers: April-June
Field mouse-ear chickweed (Cerastium arvense)
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east across North America, except for the south-central and southeastern U.S., to the Atlantic Coast.
Habitat: Open slopes and meadows, from coastal cliffs and balds to inland valleys, rocky hillsides, forest openings, and subalpine meadows.
Origin: Native
Flowers: April-August
Highbush cranberry (Viburnum opulus)
Distribution: Scattered localities throughout Washington; British Columbia south to the Columbia River Gorge, east to Idaho and Montana.
Habitat: Moist woods at low to moderate elevations.
Origin: Native
Flowers: May-July
Hoary-aster (Dieteria canescens)
Distribution: Occurring east of the Cascades crest in Washington; southern British Columbia to southern California, east to the Great Plains.
Habitat: Dry, open places in the plains and foothills, occasionally extending into the mountains.
Origin: Native
Flowers: July-October
Chalapa hoarycress (Lepidium chalepense)
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
Globepodded hoarycress (Lepidium appelianum)
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
Heart-podded hoarycress (Lepidium draba)
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
Lens-podded hoarycress (Lepidium chalepense)
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
Hogbite (Chondrilla juncea)
Distribution: Occurring chiefly east of the Cascades crest in Washington; British Columbia to California, east to Montana; also occurring in eastern North America.
Habitat: Roadsides, fields, sagebrush desert, wastelots, and other disturbed, open areas at low to middle elevations.
Origin: Introduced from Eurasia
Flowers: July-September
American hogweed (Heracleum maximum)
Distribution: Widely distributed on both sides of the Cascades crest in Washington; Alaska to California, east across North America except in the southeastern U.S.
Habitat: Moist areas, including meadows and forest edge from low to middle elevations.
Origin: Native
Flowers: June-August
Giant hogweed (Heracleum mantegazzianum)
Distribution: Occurring west of the Cascades crest in the Puget Trough lowlands in Washington; southwestern British Columbia to Oregon, also in eastern North America.
Habitat: Disturbed areas often associated with residential development; Class A noxious weed.
Origin: Introduced from Eurasia
Flowers: June-July
English holly (Ilex aquifolium)
Distribution: Introduced west of the Cascades in Washington; British Columbia south to California; Ontario province.
Habitat: Spread by birds, mostly forested areas at low elevations.
Origin: Introduced from Europe
Flowers: April-June
Braun's holly-fern (Polystichum braunii)
Distribution: Occurring east of the Cascades crest in Washington, where known only from Pend Oreille County. Alaska to northeastern Washington, east to northern Idaho, also from Great Lakes region to northeastern North America; interruptedly circumboreal.
Habitat: Moist coniferous forest, often where rocky.
Origin: Native
Spores: June-October
Holy-clover (Onobrychis viciifolia)
Distribution: Occurring east of the Cascades crest in Washington; Alaska to California, east to the Great Plains, also in eastern North America,
Habitat: Roadsides, fields, wastelots, and other disturbed areas.
Origin: Introduced
Flowers: June-August
Honesty (Lunaria annua)
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
Amur honeysuckle (Lonicera maackii)
Origin: Introduced
Bearberry honeysuckle (Lonicera involucrata)
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
Bluefly honeysuckle (Lonicera cauriana)
Distribution: Reported from Washington; Alaska to California, also in Idaho.
Origin: Native
Etruscan honeysuckle (Lonicera etrusca)
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
European fly honeysuckle (Lonicera xylosteum)
Origin: Introduced
Hairy honeysuckle (Lonicera hispidula)
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
Japanese honeysuckle (Lonicera japonica)
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
Orange honeysuckle (Lonicera ciliosa)
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
Pink honeysuckle (Lonicera hispidula)
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
Purple-flower honeysuckle (Lonicera conjugialis)
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
Rocky Mountain honeysuckle (Lonicera utahensis)
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
Showy fly honeysuckle (Lonicera ×bella)
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
Sweet-berry honeysuckle (Lonicera cauriana)
Distribution: Reported from Washington; Alaska to California, also in Idaho.
Origin: Native
Tartarian honeysuckle (Lonicera tatarica)
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
Utah honeysuckle (Lonicera utahensis)
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
Spiny hopsage (Grayia spinosa)
Distribution: Occurring east of the Cascades crest in Washington; Washington to California, east to Colorado.
Habitat: Foothills and desert valleys, often in alkaline soil.
Origin: Native
Flowers: April-June
White horehound (Marrubium vulgare)
Distribution: Both sides of the Cascades in Washington; introduced in most of the United States.
Habitat: Weed of disturbed sites
Origin: Introduced from Eurasia
Flowers: June-October
Deer horn (Clarkia pulchella)
Distribution: Chiefly east of the Cascades in Washington; British Columbia to Oregon, east to South Dakota.
Habitat: Dry, open slopes, low to mid-elevations.
Origin: Native
Flowers: May-June
Spineless hornwort (Ceratophyllum echinatum)
Origin: Native
Horse-chestnut (Aesculus hippocastanum)
Distribution: Occurring chiefly west of the Cascades crest in Washington; British Columbia to Oregon, also in central and eastern North America.
Habitat: Disturbed forested areas, particularly in urban and suburban areas where the species is planted as a street tree.
Origin: Introduced from Europe
Flowers: May-June
Gray horsebrush (Tetradymia canescens)
Distribution: Occurring east of the Cascades crest in Washington; southern British Columbia to California, east to Montana and New Mexico.
Habitat: Dry, open places in the foothills and plains.
Origin: Native
Flowers: June-September
Spineless horsebrush (Tetradymia canescens)
Distribution: Occurring east of the Cascades crest in Washington; southern British Columbia to California, east to Montana and New Mexico.
Habitat: Dry, open places in the foothills and plains.
Origin: Native
Flowers: June-September
Horseradish (Armoracia rusticana)
Distribution: Occurring in scattered locations in eastern portion of Washington; British Columbia south to California, east across the U.S. and Canada to the Atlantic Coast.
Habitat: Disturbed areas including fields, roadsides and wastelots.
Origin: Introduced from Eurasia
Flowers: May-July
Common horsetail (Equisetum arvense)
Distribution: Widely distributed on both sides of the Cascades crest in Washington; Alaska to California, east across North America, except for the south-central and southeastern U.S., to the Atlantic Coast.
Habitat: Moist to moderately dry, often disturbed places, from the lowlands to the subalpine.
Origin: Native
Spores: April-July
Field horsetail (Equisetum arvense)
Distribution: Widely distributed on both sides of the Cascades crest in Washington; Alaska to California, east across North America, except for the south-central and southeastern U.S., to the Atlantic Coast.
Habitat: Moist to moderately dry, often disturbed places, from the lowlands to the subalpine.
Origin: Native
Spores: April-July
Giant horsetail (Equisetum telmateia)
Distribution: British Columbia to California, east to Idaho
Habitat: Moist areas in the lowlands
Origin: Native
Marsh horsetail (Equisetum palustre)
Distribution: Circumboreal, south south in North America to southern Washington, northern Idaho, Nebraska and Pennsylvania.
Habitat: Streambanks, wet meadows, and marshes, from the lowlands to moderate elevations in the mountains.
Origin: Native
Nelson's horsetail (Equisetum ×nelsonii)
Origin: Native
River horsetail (Equisetum fluviatile)
Distribution: Occurring on both sides of the Cascades crest in Washington; Yukon Territory to Oregon, east to the northern Rocky Mountains and northern Great Plains, Great Lakes region, and northeastern North America.
Habitat: Shallow water, marshes and bogs, along muddy shores, from the lowlands to moderate elevations in the mountains.
Origin: Native
Spores: April-July
Scouringrush horsetail (Equisetum hyemale)
Distribution: Circumboreal; throughout the Pacific Northwest
Habitat: Moist to wet areas, lowlands to moderate elevations in the mountains
Origin: Native
Sedgelike horsetail (Equisetum scirpoides)
Distribution: Circumboreal, south in North America to northeast Washington, east to northwest Montana, Minnisota, and New York.
Habitat: Moist, swampy places, especially in coniferous forests.
Origin: Native
Shore horsetail (Equisetum ×litorale)
Origin: Native
Swamp horsetail (Equisetum fluviatile)
Distribution: Occurring on both sides of the Cascades crest in Washington; Yukon Territory to Oregon, east to the northern Rocky Mountains and northern Great Plains, Great Lakes region, and northeastern North America.
Habitat: Shallow water, marshes and bogs, along muddy shores, from the lowlands to moderate elevations in the mountains.
Origin: Native
Spores: April-July
Variegated horsetail (Equisetum variegatum)
Distribution: Alaska to Oregon, east across southern Canada and the northern third of the United States
Habitat: Wet places, sea level to alpine
Origin: Native
Water horsetail (Equisetum fluviatile)
Distribution: Occurring on both sides of the Cascades crest in Washington; Yukon Territory to Oregon, east to the northern Rocky Mountains and northern Great Plains, Great Lakes region, and northeastern North America.
Habitat: Shallow water, marshes and bogs, along muddy shores, from the lowlands to moderate elevations in the mountains.
Origin: Native
Spores: April-July
Wood horsetail (Equisetum sylvaticum)
Distribution: Occurring east of the Cascades crest in the northeastern counties in Washington; Alaska to Washington, east across southern Canada and the northern United States to the Atlantic Coast
Habitat: Shady coniferous forests, bog edges, and swamps
Origin: Native
Woodland horsetail (Equisetum sylvaticum)
Distribution: Occurring east of the Cascades crest in the northeastern counties in Washington; Alaska to Washington, east across southern Canada and the northern United States to the Atlantic Coast
Habitat: Shady coniferous forests, bog edges, and swamps
Origin: Native
Horseweed (Conyza canadensis)
Distribution: Widely distributed on both sides of the Cascades crest in Washington; British Columbia to California, east to the Atlantic Coast.
Habitat: Roadsides, fields, balds, prairies, ditches, wastelots, and other disturbed, open areas at low elevations.
Origin: Native
Flowers: July-September
Common hound's tongue (Cynoglossum officinale)
Distribution: Widely distributed east of the Cascades crest in Washington; British Columbia to California, east across North America to the Atlantic Coast.
Habitat: Roadsides, fields, meadows, forest edge, ditches, and other disturbed open areas; noxious weed.
Origin: Introduced from Eurasia
Flowers: May-July
Adeline's hound's-tongue (Adelinia grandis)
Distribution: Occurring west of the Cascades crest and in the Columbia River Gorge in Washington; Washington to California.
Habitat: Forest openings and meadows at low to moderate elevations.
Origin: Native
Flowers: April-May
Pacific hound's-tongue (Adelinia grandis)
Distribution: Occurring west of the Cascades crest and in the Columbia River Gorge in Washington; Washington to California.
Habitat: Forest openings and meadows at low to moderate elevations.
Origin: Native
Flowers: April-May
Water Howellwort (Howellia aquatilis)
Distribution: Chiefly west of the Cascades in Washington; Washington south to California, east to Idaho and Montana.
Habitat: In ponds and lakes.
Origin: Native
Flowers: May-July
Evergreen huckelberry (Vaccinium ovatum)
Distribution: Occurring west of the Cascades crest in Washington; British Columbia south to California.
Habitat: Coniferous forests at low elevations.
Origin: Native
Flowers: April-August
Blueleaf huckleberry (Vaccinium deliciosum)
Distribution: Ocurring in the Olympic and Cascade Mountains of Washington; British Columbia south to California, east to Idaho.
Habitat: Forest openings and mountain meadows, mid- to high elevations.
Origin: Native
Flowers: May-July
Dwarf huckleberry (Vaccinium cespitosum)
Distribution: Widely distributed in the mountainous areas of Washington; Alaska south to California, east to Colorado; across southern Canada and the northern tier of states from Minnesota to Maine.
Habitat: Moist rocky ridges and meadows, mid- to high elevations in the mountains.
Origin: Native
Flowers: May-July
Fool's huckleberry (Rhododendron menziesii)
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east to Alberta, Idaho, Montana, and Wyoming.
Habitat: Forest understory and edges from middle elevations to the subalpine.
Origin: Native
Flowers: April-June
Red huckleberry (Vaccinium parvifolium)
Distribution: Occurring chiefly west of the Cascades crest in Washington; Alaska to California.
Habitat: Moist woods, forest edges and openings, from sea level to middle elevations in the mountains.
Origin: Native
Flowers: April-June
Tall huckleberry (Vaccinium membranaceum)
Distribution: Widely distributed throughout forested and mountainous areas of Washington; British Columbia south to California, east the Rocky Mountains; Ontario and Michigan.
Habitat: Common in dry to moist coniferous forests and open areas, moderate to mid-elevations in the mountains.
Origin: Native
Flowers: May-July
Thin-leaved huckleberry (Vaccinium membranaceum)
Distribution: Widely distributed throughout forested and mountainous areas of Washington; British Columbia south to California, east the Rocky Mountains; Ontario and Michigan.
Habitat: Common in dry to moist coniferous forests and open areas, moderate to mid-elevations in the mountains.
Origin: Native
Flowers: May-July
Dwarf hulsea (Hulsea nana)
Distribution: Known from the Mt. Rainier and Mt. Adams area in Washington; Washington south to California.
Habitat: Generally around volcanic mountains above timberline.
Origin: Native
Flowers: July-September
Hungerweed (Ranunculus arvensis)
Distribution: Occurring east of the Cascades crest in Washington; British Columbia to California, east to Idaho and Utah; also in areas of central and eastern U.S.
Habitat: Dry woodlands and waste ground.
Origin: Introduced from Europe
Flowers: May-June
Hutchinsia (Hornungia procumbens)
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia south to California, east to the Rocky Mountains, central Canada, and Newfoundland.
Habitat: Open areas where seasonally moist.
Origin: Native?
Flowers: March-June
Prostrate hutchinsia (Hornungia procumbens)
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia south to California, east to the Rocky Mountains, central Canada, and Newfoundland.
Habitat: Open areas where seasonally moist.
Origin: Native?
Flowers: March-June
Water hyacinth (Eichhornia crassipes)
Distribution: Known from a few localities in southern Washington; California east along the southern part of the U.S. to Florida.
Habitat: Ponds, ditches, canals.
Origin: Introduced from tropical America
Flowers: April-September
Wild hyacinth (Triteleia hyacinthina)
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia south to Oregon, east to Idaho.
Habitat: Sagebrush deserts and grassy, often rocky areas from low to mid-elevations in the mountains.
Origin: Native
Flowers: May-August
Hydrilla (Hydrilla verticillata)
Origin: Introduced from Eurasia
Fineleaf hymenopappus (Hymenopappus filifolius)
Distribution: Occurring east of the Cascades crest in Washington; Washington south to California, east to the Great Plains of Canada and the U.S.
Habitat: Dry, often sandy places in the foothills and plains.
Origin: Native
Flowers: May-July
Wild hyssop (Verbena hastata)
Distribution: Chiefly east of the Cascades in Washington; widely distributed throughout North America.
Habitat: Marshes, wetlands, streamsides, and other riparian areas.
Origin: Native
Flowers: July-September