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 H:
Hackelia americananodding stickseed
Origin: Native
Flowers: June - August
Hackelia ciliataOkanogan stickseed
Distribution: Spokane and Stevens Counties to Okanogan and Kittitas Counties, Washington
Habitat: Dry, open slopes and flats in areas with sagebrush or ponderosa pine.
Origin: Native
Flowers: May - June
Hackelia cinereagray stickseed
Distribution: Occurring east of the Cascades crest in central and eastern Washington; central Washington to Idaho and Montana.
Habitat: Open or lightly forested areas, especially on talus or cliffs, and loose stream banks, in valleys and foothills to moderate elevations in the mountains.
Origin: Native
Flowers: May-July
Hackelia diffusadiffuse stickseed
Distribution: Occurring east of the Cascades in Washington; British Columbia south to Oregon.
Habitat: Cliffs and talus slopes.
Origin: Native
Flowers: May-July
var. arida – sagebrush stickseed, steppe stickseed
var. cottonii – Cotton's stickseed
var. diffusa – diffuse stickseed
Hackelia floribundamanyflowered stickseed
Distribution: Occurring east of the Cascades crest in Washington; Southern British Columbia south to California, east to the Rocky Mountains.
Habitat: Thickets, meadows, stream banks and other moist places, from low elevations to mid-elevations in the mountains.
Origin: Native
Flowers: June-August
Hackelia hispidarough stickseed
Distribution: Snake River Canyon and vicinity in Oregon, Idaho and Washington; also in the Grand Coulee of Washington.
Habitat: Cliffs and talus slopes.
Origin: Native
Flowers: May - July
var. disjuncta – sagebrush stickseed
var. hispida – rough stickseed
Hackelia micranthameadow forget-me-not, blue stickseed
Distribution: Occurring chiefly east of the Cascades crest in Washington; Alaska to California, east to the Rocky Mountains.
Habitat: Moist, open hillsides seasonally wet forest openings, and riparian corridors from montane to subalpine.
Origin: Native
Flowers: June-August
Hackelia tayloriiTaylor's stickseed
Origin: Native
Hackelia venustalesser showy stickseed
Distribution: Endemic to Chelan County, WA.
Habitat: Rocky slopes with ponderosa pine, at about 1000 feet elevation.
Origin: Native
Flowers: May-June
Halerpestes cymbalariaalkali buttercup, seaside buttercup
Distribution: Occurring on both sides of the Cascades crest in Washington; widely distributed throughout much of North America except southern and southeastern regions of U.S.
Habitat: Ditches, marshes and muddy meadowlands, often where saline or alkaline.
Origin: Native
Flowers: May-August
Halogeton glomeratushalogeton, saltlover
Origin: Introduced from Eurasia
Flowers: July - September
Harrimanella stellerianaAlaska bell-heather, Alaska bellheather, alpine heather, Alaskan moss-heather, Alaskan mountain-heather
Distribution: Alaska to the high Cascades of Washington
Habitat: Rocky slopes and seeps, alpine to subalpine
Origin: Native
Flowers: July - August
Hedera colchica
Origin: Introduced
Hedera helixcommon ivy, English ivy
Distribution: Introduced as an ornamental, but freely disseminated by birds and widely established in western Washington and Oregon.
Habitat: Wooded areas at low elevations.
Origin: Introduced
Flowers: May - June
Hedera hibernicaAtlantic ivy
Origin: Introduced
Hedysarum occidentalewestern sweet-vetch
Distribution: Occurring in the Olympic Mountains in Washington; British Columbia to Washington, Idaho and Utah, east to Alberta, Montana, Wyoming, and Colorado.
Habitat: Alpine and subalpine meadows.
Origin: Native
Flowers: June-August
var. occidentale – western sweet-vetch
Hedysarum sulphurescensyellow sweet-vetch
Distribution: Occurring east of the Cascades crest in north-central and northeastern Washington; British Columbia to Washington, east to Alberta, Montana, and Wyoming, also reported from northeastern Oregon.
Habitat: Open forested areas.
Origin: Native
Flowers: June-August
Helenium autumnalecommon sneezeweed, large flowered sneezeweed
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to California, east across North America to the Atlantic Coast.
Habitat: Stream banks and other moist, low ground generally at low elevations.
Origin: Native
Flowers: July-September
Helianthella unifloraRocky Mountain helianthella
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
var. douglasii – Douglas helianthella, false sunflower
Helianthus annuuscommon sunflower
Distribution: Occurring chiefly east of the Cascades in Washington; British Columbia to California, east across North America to the Atlantic Coast.
Habitat: Fields, roadsides, wastelots, and other open areas, often where disturbed, at low to middle elevations.
Origin: Native and introduced populations in Washington
Flowers: June-September
Helianthus ciliarisblueweed
Distribution: Known historically from east of the Cascades crest in Yakima County, where presumably eliminated by herbicide treatment due to it being a noxious weed; California, east across the southwestern U.S. to the southern Great Plains and Illinois.
Habitat: Disturbed, open ground in sagebrush.
Origin: Introduced
Flowers: June-August
Helianthus cusickiiCusick's sunflower, turniproot sunflower
Distribution: Occurring east of the Cascades crest in Washington; Washington to California, east to Idaho and Nevada.
Habitat: Sagebrush, grasslands, dry slopes, and other open areas at low to middle elevations.
Origin: Native
Flowers: April-August
Helianthus nuttalliiNuttall's sunflower
Distribution: Chiefly east of the Cascades: Western and Mid-western United States and adjacent Canada
Habitat: Meadows and other moist places, low to moderate elevations in the mountains
Origin: Native
Flowers: July - September
ssp. nuttallii – cordilleran sunflower, Nuttall's sunflower
Helianthus petiolarisprairie sunflower
Distribution: Occurring east of the Cascades crest in Washington; Washington to California, east to the Atlantic Coast.
Habitat: Dry, open areas, often where disturbed.
Origin: Introduced from the Great Plains
Flowers: June-September
ssp. petiolaris – prairie sunflower
Helianthus tuberosusJerusalem artichoke
Distribution: Occurring in scattered locations chiefly east of the Cascades crest in Washington; .Washington, east to the Rocky Mountains, native from the Great Plains to the Atlantic Coast.
Habitat: Roadsides, fields, ditches, wastelots, and other disturbed areas, where escaping from cultivation.
Origin: Introduced from central and eastern North America
Flowers: August-October
Heliotropium curassavicumsalt heliotrope, seaside heliotrope
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
Helleborus foetidusstinking hellebore
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
Hemerocallis fulvaorange daylily
Distribution: Occurring in the Puget Sound lowlands; widely distributed throughout North America.
Habitat: Roadsides, old homesteads, stream banks, disturbed sites.
Origin: Introduced from eastern Asia
Flowers: May-July
Hemieva ranunculifoliabuttercup-leaf mock brookfoam
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to northern California, east to Alberta and Montana.
Habitat: Foothills to subalpine slopes, on wet, mossy rocks, often where dry by mid-summer.
Origin: Native
Flowers: May-August
Hemitomes congestumconeplant, gnome-plant
Distribution: West of the Cascades in Washington; Vancouver Island and mainland British Columbia south to Monterey County, California.
Habitat: Rich humus in damp coniferous forests at mid-elevations in the mountains.
Origin: Native
Flowers: June-August
Hemizonella minimasmallhead tarplant, least tarweed, small-head tarweed, smallhead tarweed
Distribution: Occurring chiefly east of the Cascades crest in Washington; southern British Columbia to California, east to Montana and Nevada.
Habitat: Dry, open areas in sagebrush, grasslands, and ponderosa pine forest openings.
Origin: Native
Flowers: May-July
Heracleum mantegazzianumgiant hogweed
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
Heracleum maximumAmerican cow-parsnip, American hogweed
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
Herniaria hirsutahairy rupturewort
Distribution: Recently collected in Spokane County; Washington and California, also in Maryland and Massachusetts
Habitat: Disturbed sandy flats, roadsides, and woodlands at low elevation
Origin: Introduced
Flowers: May-July
Hesperis matronalismother-of-the-evening, dame's rocket
Distribution: Occurring chiefly west of the Cascades crest and in the Columbia River Gorge in Washington; British Columbia to California, east across most of North America to the Atlantic Coast.
Habitat: Roadsides, disturbed forest edge, wastelots, and other disturbed areas where escaping from cultivation.
Origin: Introduced from Europe
Flowers: May-June
Hesperochiron californicusCalifornia hesperochiron, California monkey-fiddle
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
Hesperochiron pumilussmall hesperochiron, small monkey-fiddle
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
Hesperostipa comataneedle-and-thread
Distribution: British Columbia south on the east side of the Cascades to California, east to Ontario and Texas.
Habitat: Plains and prairies to forested areas in the mountains.
Origin: Native
Flowers: May - July
ssp. comata – needle and thread
ssp. intermedia – Tweedy's needlegrass
Heteranthera dubiagrassleaf mud-plantain, water stargrass
Distribution: In scattered localities in Washington, however locally common and abundant in lower Yakima River; British Columbia south to California, widespread in eastern North America.
Habitat: Quiet streams, ponds and lakes.
Origin: Native
Flowers: July-September
Heterocodon rarifloruswestern pearlflower
Distribution: East of the Cascades in Washington; southern British Columbia south to California, east to Idaho and Nevada.
Habitat: Moist, open places in the foothills and valleys to moderate elevations in the mountains.
Origin: Native
Flowers: June-August
Heterotheca oregonaOregon goldenaster
Distribution: British Columbia to California, east base of the Cascades to the coast.
Habitat: Sand and gravel bars along rivers, low to moderate elevations.
Origin: Native
Flowers: June-Sept.
Heterotheca villosahairy goldaster
Distribution: Widespread in Washington and Oregon, chiefly east of the Cascades; east to Michigan
Habitat: Open, sunny areas, often in sandy soil, low to moderate elevations
Origin: Native
Flowers: June-September
var. foliosa – leafy goldenaster
var. minor – hairy goldenaster, hispid goldenaster
var. villosa – hairy goldaster, hairy goldenaster
Heuchera chloranthagreen-flowered alumroot, meadow alumroot, tall alumroot
Distribution: West of the Cascade summit, Queen Charlotte Island, British Columbia south to Douglas County, Oregon, up the Columbia River Gorge to the east base of the Cascades, then south along the Oregon Cascades to Klamath County, OR.
Habitat: Gravelly prairies and wooded hillsides.
Origin: Native
Flowers: May - August
Heuchera cylindricalava alumroot, poker alumroot, roundleaf alumroot
Distribution: Occurring east of the Cascades crest in Washington; British Columbia to California, east to Alberta, Wyoming, and Nevada.
Habitat: Rocky soil, cliffs and talus slopes, foothills to the subalpine.
Origin: Native
Flowers: April-August
Heuchera glabraalpine alumroot, smooth alumroot
Distribution: In the Cascades, Olympics, and Selkirks and m ountains in Washington; Alaska south to Mt. Hood, Oregon.
Habitat: Streambanks and moist rocks, from the coast to above timberline
Origin: Native
Flowers: June-August
Heuchera grossulariifoliagooseberry-leaved alumroot
Distribution: Occurring east of the Cascades crest in the Columbia River Gorge in south-central Washington; Columbia River Gorge to Nevada, east to Idaho and western Montana.
Habitat: Grassy canyons and rocky canyon walls to alpine scree and talus slopes.
Origin: Native
Flowers: May-August
var. grossulariifolia – gooseberry-leaved alumroot
var. tenuifolia – gooseberry-leaved alumroot
Heuchera micranthasmallflower alumroot
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia south to California, east to Idaho.
Habitat: Gravelly stream banks, rock crevices and talus slopes, sea level to subalpine.
Origin: Native
Flowers: May-August
var. diversifolia – small-flowered alumroot
var. micrantha – small-flowered alumroot
Hieracium albiflorumwhite hawkweed, white-flowered hawkweed
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
Hieracium aurantiacumorange hawkweed
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
Hieracium caespitosummeadow hawkweed, yellow king devil
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
Hieracium flagellarewhip hawkweed
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
Hieracium ×floribundumflowery hawkweed
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
Hieracium glomeratumyellow devil hawkweed
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
Hieracium lachenaliicommon hawkweed, English hawkweed, European hawkweed
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
Hieracium longiberbelong-bearded hawkweed
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
Hieracium maculatummottled hawkweed
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
Hieracium murorumwall hawkweed
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
Hieracium pilosellamouse-ear hawkweed
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
Hieracium piloselloidestall hawkweed
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
Hieracium sabaudumsavoy hawkweed
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
Hieracium scoulerihound-tongue hawkweed, Scouler's hawkweed
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
Hieracium ×stoloniflorumforked hawkweed
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
Hieracium tristealpine hawkweed, slender hawkweed
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
Hieracium umbellatumnarrowleaf hawkweed, umbellate hawkweed
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
Hierochloe occidentalisCalifornia sweet grass, California sweetgrass
Origin: Native
Hierochloe odoratahairy sweetgrass, vanillagrass
Distribution: Occurring in scattered locations across Washington; Alaska south to Washington, east across the northern half of North America to the Atlantic Coast.
Habitat: Wet meadows and marshes.
Origin: Native
Flowers: May-June
Hippuris montanamountain mare's-tail
Distribution: Chiefly west of the Cascades in Washington; Alaska to Washington, east to Northwest Territories and Alberta.
Habitat: Wet meadows, streams and mossy banks in the moungtains
Origin: Native
Flowers: July-September
Hippuris vulgariscommon mare's-tail
Distribution: Widely distributed on both sides of the Cascades in Washington; Alaska to south California and New Mexico, east through southern Canada and the northern states to Maine.
Habitat: Streams, ponds and shallow lakes, generally at least partially emerged.
Origin: Native
Flowers: June-August
Hirschfeldia incanaMediterranean hoary mustard, short-podded mustard, summer mustard
Distribution: Occurring chiefly west of the Cascades crest in Washington; Washington to California, east to Nevada.
Habitat: Disturbed, open areas at low elevations.
Origin: Introduced
Flowers: June-September
Holcus lanatuscommon velvet grass
Distribution: Occurring chiefly west of the Cascades crest and east in the Columbia River Gorge in Washington; Alaska to California, east across much of North America to the Atlantic Coast.
Habitat: Balds, prairies, roadsides, meadows, lawns, wastelots, and other disturbed open areas.
Origin: Introduced from Europe
Flowers: May-July
Holcus molliscreeping softgrass, creeping velvet-grass
Origin: Introduced
ssp. mollis – creeping velvet grass
Holodiscus discolorcreambush ocean-spray, hillside ocean-spray
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to California, east to the Rocky Mountains and Texas.
Habitat: Gravelly soil in open, dry to moist woods, coastal bluffs to moderate elevations in the mountains.
Origin: Native
Flowers: June-August
var. discolor – ocean-spray
Holosteum umbellatumjagged-chickweed
Distribution: Occurring chiefly east of the Cascades crestin Washington; British Columbia south to California, east to the Atlantic Coast.
Habitat: Disturbed areas, most common in the shrub-steppe.
Origin: Introduced from Europe
Flowers: April-May
Honckenya peploidessea purslane, seabeach sandwort
Distribution: Occuring west of the Cascades crest in the coastal counties in Washington; Alaska to northern Oregon, east across Canada to coastal northeastern North America; Greenland and arctic Eurasia.
Habitat: Coastal beaches, strands, and sand dunes.
Origin: Native
Flowers: May-September
ssp. major – sea purslane, seabeach sandwort
Hordeum brachyantherummeadow barley
Distribution: Alaska south to California, east to Montana and Colorado.
Habitat: Ocean beaches to mountain meadows,usually where moist, but also from dry sagebrush desert to rocky ridges.
Origin: Native
Flowers: June - August
ssp. brachyantherum – meadow barley
Hordeum depressumdwarf barley
Distribution: Introduced from Vancouver Island, British Columbia, south on both sides of the Cascades to southern California, east to western Idaho.
Habitat: A weed of waste areas, especially where moist.
Origin: Native
Flowers: April - June
Hordeum jubatumfoxtail barley
Distribution: Alaska south on both sides of the Cascades to California, east across Canada to the Atlantic Coast, south to Mexico.
Habitat: Common weed of dry to moist soil, from sagebrush desert to grasslands and mountain forests, often abundent in disturbed areas.
Origin: Native
Flowers: June - August
ssp. jubatum – foxtail barley
Hordeum marinumMediterranean barley
Origin: Introduced
ssp. gussoneanum – Mediterranean barley
Hordeum murinummouse barley, smooth barley, wall barley
Distribution: Uncommon weed in the United States, occasional in southern British Columbia and western Washington.
Habitat: Disturbed soil and wasteland.
Origin: Introduced
Flowers: June - July
ssp. glaucum – mouse barley
ssp. leporinum – mouse barley
ssp. murinum – mouse barley
Hordeum pusillumlittle barley
Distribution: Eastern Washington south to southern California, east to the Atlantic Coast.
Habitat: Grasslands to desert areas, often on saline soils and wasteland.
Origin: Native
Flowers: April - June
Hordeum vulgarebarley
Distribution: Occurring in scattered locations on both sides of the Cascades crest in Washington; widely distributed throughout North America.
Habitat: Old fields, wasteland, roadsides, and other disturbed areas where escaped from cultivation.
Origin: Introduced
Flowers: May-June
ssp. vulgare – common barley
Horkelia fusca
Distribution: Occurring east of the Cascades crest in Washington; Washington south to California, east to Idaho and Wyoming.
Habitat: Damp meadows to open forest and rocky slopes, moderate to mid-elevations in the mountains.
Origin: Native
Flowers: June-July
var. capitata – horkelia
var. fusca – horkelia, tawny horkelia
Hornungia procumbenshutchinsia, prostrate hutchinsia, ovalpurse
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
Hosackia crassifoliabig deervetch
Distribution: Occurring chiefly west of the Cascades in Washington; Washington to California.
Habitat: Moist woods and along streams, from sea level to moderate elevations in the mountains.
Origin: Native
Flowers: May-July
var. crassifolia – big deervetch
Hosackia gracilisseaside bird's-foot-trefoil
Distribution: Occurring west of the Cascades crest in Washington; Washington to California.
Habitat: On moist soil, from near sea level to lower elevations in the mountains.
Origin: Native
Flowers: May-July
Hosackia pinnatameadow bird's-foot-trefoil, meadow deervetch
Distribution: Occurring chiefly west of the Cascades crest and in the Columbia River Gorge in Washington, but also in far eastern Washington; southwestern British Columbia to California, also in western Idaho.
Habitat: Moist areas and wetlands, lowland to montane.
Origin: Native
Flowers: May-July
Hosackia rosearosy bird's-foot-trefoil
Distribution: Occurring west of the Cascades crest in Washington; Washington to California.
Habitat: Moist woods and along streams.
Origin: Native
Flowers: May-July
Howellia aquatiliswater Howellwort
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
Hulsea nanadwarf alpinegold, dwarf hulsea
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
Humulus lupulus
Distribution: Occasionally escaping from cultivation, but rarely becoming established in Washington; occasionally escaped from cultivation in many areas in North America.
Habitat: Waste ground.
Origin: Introduced
Flowers: July-August
var. neomexicanus – hops
Huperzia continentalisalpine firmoss
Distribution: In the Olympics and Cascades mountains in Washington; primarily Alaska to Washington, east to Montana; also in Wyoming and Colorado, scattered across northern Canada and on Greenland.
Habitat: Subalpine and alpine meadows, heath, and rocky slopes. Usually at high elevations.
Origin: Native
Huperzia miyoshianafir clubmoss
Distribution: Occurring west of the Cascades crest in Washington; Alaska to northwest Oregon, east to Idaho and western Montana; also in eastern Asia.
Habitat: Moist, brushy talus slopes, edges of coniferous forests, or mossy rocks, from middle elevations to the subalpine.
Origin: Native
Huperzia occidentaliswestern clubmoss
Distribution: Coastal ranges from SE Alaska and SW Yukon south to Oregon; also in SE British Columbia, northern Idaho, and northwest Montana. Not found outside North America. In Washington, found from the west side of the Cascades west to the coast.
Habitat: In shaded conifer forest, usually where moist such as along streams and in depressions; rooted on decaying logs, duff, or soil. Low to mid elevations.
Origin: Native
Hyacinthoides ×massartianacommon bluebell, garden bluebell, hybrid bluebell
Distribution: Occurring west of the Cascades crest and in the Columbia River Gorge in Washington; British Columbia to Oregon.
Habitat: Meadows, fields, grassy balds, and other open areas at low elevations.
Origin: Introduced from Europe
Flowers: April-May
Hyacinthoides non-scriptaEnglish bluebells
Origin: Introduced
Hydrilla verticillatahydrilla, water thyme
Origin: Introduced from Eurasia
Hydrocharis morsus-ranaefrogs's-bit
Origin: Introduced
Hydrocotyle ranunculoidesfloating marsh-pennywort
Distribution: West of the Cascades in Washington; Washington south to California, east to the Atlantic coast.
Habitat: Marshes, ponds and wet ground.
Origin: Native
Flowers: April-July
Hydrophyllum capitatumwool breeches, ballhead waterleaf
Distribution: Occurring mostly east of the Cascades crest in Washington; British Columbia to California, east to the Rocky Mountains.
Habitat: Moist, open slopes and woodlands, foothills to middle elevations in the mountains.
Origin: Native
Flowers: March-July
var. capitatum – wool breeches, ballhead waterleaf
var. thompsonii – Thompson's wool breeches, Thompson's ballhead waterleaf
Hydrophyllum fendleriFendler's waterleaf
Distribution: Widely distributed throughout much of Washington; British Columbia south to California, east to Utah.
Habitat: Thickets and moist open places, from lowlands to mid elevations in mountains.
Origin: Native
Flowers: May-August
var. albifrons – Fendler's waterleaf
var. fendleri – Fendler's waterleaf
Hydrophyllum tenuipesPacific waterleaf
Distribution: Occurring west of the Cascades crest in Washington; southwestern British Columbia to California.
Habitat: Forest understory and edge at low elevations, often where moist.
Origin: Native
Flowers: May-July
Hymenopappus filifoliusColumbia cut-leaf, fineleaf hymenopappus
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
var. filifolius – Columbia cutleaf
Hymenophyllum wrightiiWright's filmy fern
Origin: Native
Hyoscyamus nigerhog's bean, black henbane
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
Hypericum anagalloidesbog John's-wort, creeping St. John's-wort, tinker's penny
Distribution: Occurring on both sides of the Cascades in Washington; British Columbia south to Baja California, east to Montana.
Habitat: Moist ground, from the coast to mid-elevations in the mountains.
Origin: Native
Flowers: June-August
Hypericum androsaemumtutsan
Origin: Introduced from Europe
Hypericum borealenorthern St. John's-wort
Origin: Introduced from eastern North America
Hypericum calycinumAaron's beard, great St. John's-wort
Distribution: Occurring west of the Cascades crest in Washington; southwestern British Columbia to California; also in eastern North America.
Habitat: Roadsides, cliffs, embankments, fields, parks, forest edge, wastelots, and other disturbed areas.
Origin: Introduced from Turkey and Bulgaria
Flowers: May-July
Hypericum canadenseCanadian St. John's-wort
Origin: Introduced from eastern North America
Hypericum ellipticumpale St. John's-wort
Origin: Introduced from eastern North America
Hypericum maculatumspotted St. John's-wort, streaked St. John's-wort
Origin: Introduced
ssp. obtusiusculum – dotted John's-wort, imperforate St. John's-wort
Hypericum majusgreater Canadian St. John's-wort
Distribution: Occurring in localities throughout Washington; British Columbia south to Oregon, east to the Atlantic Coast of North America.
Habitat: Wet ground.
Origin: Both native and introduced from eastern North America
Flowers: July-September
Hypericum mutilumdwarf St. John's-wort
Origin: Introduced from eastern North America
Hypericum perforatumcommon St. John's-wort, Klamath weed
Distribution: Widespread on both sides of the Cascades crest in Washington; widespread throughout much of North America.
Habitat: Noxious weed of fields, meadows, roadsides, forest edge, wastelots, and other disturbed areas from the lowlands to near subalpine.
Origin: Introduced from Europe
Flowers: June-July
Hypericum scouleriNorton's St. John's-wort, Scouler's St. John's-wort, western John's-wort
Distribution: Widely distributed throughout Washington; British Columbia south to California, east to the Rocky Mountains.
Habitat: Moist places from along the coast to well up in the mountains.
Origin: Native
Flowers: June-September
Hypericum tetrapterumsquare-stalked St. John's Wort
Distribution: Introduced occasionally in western Washington.
Habitat: Damp wasteland.
Origin: Introduced
Flowers: July - September
Hypochaeris glabrasmooth cat's-ear
Distribution: Occurring west of the Cascades crest and east in the Columbia River Gorge in Washington; British Columbia to California, also from Texas to the northeastern U.S.
Habitat: Roadsides, rocky balds, meadows, wastelots, and other disturbed open areas at low elevations, often where sandy.
Origin: Introduced from Europe
Flowers: May-June
Hypochaeris radicatahairy cat's-ear, rough cat's-ear
Distribution: Occurring chiefly west of the Cascades crest in Washington; Alaska to California, east to the Rocky Mountains, and further east across most of North America to the Atlantic Coast.
Habitat: Disturbed areas, grassy balds, prairies, grasslands, lawns, and roadsides.
Origin: Introduced from Europe
Flowers: May-October