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 in Kittitas, Chelan and Spokane counties in Washington; Washington east to northern Idaho and northwest 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: Common, Cascade Mountains in Washington and Oregon, Rocky Mountains in Idaho
Habitat: Hillsides and open areas at mid-elevations
Origin: Native
Flowers: Jun-Aug
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.
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 south to Washington, Idaho and Utah, east to Alberta, Montana, Wyoming, and Colorado.
Habitat: Alpine and subalpine areas.
Origin: Native
Flowers: June-August
var. occidentale – western sweet-vetch
Hedysarum sulphurescensyellow sweet-vetch
Distribution: East slope of the Cascades in Washington; British Columbia to Washington, east to Alberta and Montana.
Habitat: Open forested areas.
Origin: Native
Flowers: June-August
Helenium autumnalecommon sneezeweed, large flowered sneezeweed, mountain sneezweed
Distribution: British Columbia to Quebec, south to Arizona and Florida
Habitat: Stream banks and other moist, low ground in the valleys and foothills.
Origin: Native
Flowers: July - September
Helianthella unifloraRocky Mountain helianthella
Distribution: Occurring east of the Cascades crest in Washington; British Columbia south to Oregon and Nevada, east to the Rocky Mountains.
Habitat: Dry, open woods at low to mid-elevations.
Origin: Native
Flowers: May-August
var. douglasii – Douglas helianthella, false sunflower
Helianthus annuuscommon sunflower
Distribution: Occurring chiefly east of the Cascades in Washington, but also on west side where escaped from cultivation.
Habitat: Open, dry to moderately moist soil; foothills, valleys and waste land.
Origin: Native and introduced populations in Washington
Flowers: June-September
Helianthus ciliaris
Origin: Introduced
Helianthus cusickiiCusick's sunflower, turniproot sunflower
Distribution: In Washington, from Chelan County south between the Cascades and the Columbia River, eastern Oregon and adjacent Idaho, and northeastern California.
Habitat: Dry, open plains and foothills.
Origin: Native
Flowers: April - August
Helianthus grosseserratussawtooth sunflower
Origin: Introduced from eastern North America along railroads at Bingen and near Spokane
Helianthus maximilianinarrow leaved sunflower
Distribution: Introduced from east of the Rockies to British Columbia, Idaho, and eastern Washington.
Habitat: Dry, open places, often on waste ground.
Origin: Introduced
Flowers: July-September
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
Origin: Introduced from further east
Flowers: June - September
Helianthus tuberosusJerusalem artichoke
Distribution: Introdued and widespread in eastern United States; uncommon in the Pacific Northwest.
Habitat: Moist soil and waste places.
Origin: Introduced
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 foetidus
Origin: Introduced
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
Hemerocallis lilioasphodelusyellow daylily
Origin: Introduced
Hemieva ranunculifoliabuttercup-leaf mock brookfoam
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia south 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: Both sides of the Cascades in Washington; southern British Columbia south to California, east to northern Idaho.
Habitat: Dry, open ponderosa pine woods and prairies.
Origin: Native
Flowers: May-July
Heracleum mantegazzianumgiant hogweed
Distribution: Occurring west of the Cascades crest in Washington;
Habitat: Disturbed areas often associated with residential development.
Origin: Introduced
Flowers: June-July
Heracleum maximumAmerican cow-parsnip, cow parsnip
Distribution: Widely distributed throughout Washington; occurring throughout North America except for southeastern and lower Midwest of U.S.
Habitat: Moist areas, low to mid-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, dame's violet
Distribution: Scattered locations on both sides of the Cascades in Washington; distributed throughout North America except for the southern portion of the U.S.
Habitat: Sometimes escaping and persisting on waste ground.
Origin: Introduced from Europe
Flowers: May-June
Hesperochiron californicusCalifornia monkey-fiddle
Distribution: East of the Cascades in Washington; south to California, eastward from Montana to Utah.
Habitat: Mostly in more or less alkaline meadows and flats, in plains, foothills and valleys
Origin: Native
Flowers: April-June
Hesperochiron pumilusdwarf monkey-fiddle
Distribution: East of the Cascade summits in Washington; Washington south to California, east to Utah and Arizona.
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 cylindricapoker alum-root, lava alumroot, roundleaf alumroot
Distribution: East of the Cascade summits, British Columbia to California, east to Alberta and Wyoming
Habitat: Rocky soil, cliffs and talus slopes, foothills to mid-elevations in the mountains
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: Southwest Montana and central Idaho to the Wallowa Mountains of northeast Oreagon, and the Columbia River Gorge of Washington and Oregon.
Habitat: Grassy canyons and rocky canyon walls to alpine scree and talus slopes.
Origin: Native
Flowers: May - Early August
var. grossulariifolia – 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
Hibiscus moscheutoscrimsoneyed rosemallow
Distribution: Sporadic in central Washington; native to eastern North America
Habitat: Moist areas along edge of ponds and lakes.
Origin: Introduced
Flowers: July-August
Hibiscus trionumflower-of-an-hour
Distribution: Scattered locations east of the Cascades in Washington; widely distributed througout much of North America.
Habitat: Garden escape in disturbed areas.
Origin: Introduced
Flowers: June-July
Hieracium albiflorumwhite flowered hawkweed, white hawkweed
Distribution: British Columbia to California, east to Colorado
Habitat: Open woods at moderate to mid-elevations in the mountains.
Origin: Native
Flowers: June - August
Hieracium aurantiacumking devil, orange hawkweed, devil's paintbrush
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia south to California, east across southern Canada and northern U.S; widely distributed throughout eastern U.S.
Habitat: Moist sites from lowlands to mid-elevations in the mountains, typically where disturbed.
Origin: Introduced from Europe
Flowers: June-August
Hieracium caespitosumyellow king devil, meadow hawkweed
Distribution: Widely distributed on both sides of the Cascades crest in Washington; British Columbia south to Washington, east to Idaho, Montana, and Wyoming; also occurring throughout eastern North America.
Habitat: Moist places from the lowlands to moderate elevations in the mountains, usually where the soil has been disturbed.
Origin: Introduced from Europe
Flowers: June-August
Hieracium flagellarewhip hawkweed
Origin: Introduced from Europe
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
Origin: Introduced
Hieracium lachenaliicommon hawkweed, English hawkweed, European hawkweed
Distribution: Uncommon introduction west of the Cascades in Washington and Oregon
Habitat: Disturbed areas
Origin: Introduced from Europe
Flowers: June - August
Hieracium longiberbelong bearded hawkweed
Distribution: Columbia River Gorge, Washington and Oregon.
Habitat: Hillsides and rock crevices.
Origin: Native
Flowers: June - July
Hieracium maculatummottled hawkweed
Origin: Introduced from Europe
Hieracium murorumwall hawkweed
Distribution: In scattered locations in lowland western Washington; British Columbia south to Washington; occurring throughout northeastern North America.
Habitat: Distrurbed areas and forest edge.
Origin: Introduced from Europe
Flowers: April-June
Hieracium pilosellamouse ear hawkweed
Distribution: Occurring west of the Cascades crest in Washington; British Columbia south to Oregon; northeastern North America.
Habitat: Disturbed areas, forest openings, prairies, meadows, and roadsides.
Origin: Introduced from Europe
Flowers: June-August
Hieracium piloselloidestall hawkweed
Origin: Introduced from Europe
Hieracium sabaudumsavoy hawkweed
Origin: Introduced from Europe
Hieracium scoulerihound tongue hawkweed, Scouler's hawkweed, woolly weed
Distribution: Widely distributed throughout Washington; British Columbia south to California, chiefly in the Cascade-Sierra Nevada region.
Habitat: Mostly dry places in open woods, foothills to moderate or sometimes higher elevations in the mountains.
Origin: Native
Flowers: June-August
Hieracium stoloniflorumforked hawkweed
Origin: Introduced from Europe
Hieracium tristealpine hawkweed, slender hawkweed
Distribution: Occurring throughout the mountainous areas in Washington; Alaska south to California, east 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 chiefly east of the Cascades crest in Washington; Alaska south to northwest 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
Origin: Introduced
Holcus lanatuscommon velvet grass
Distribution: Widely introduced in Canada and the United States, more common west of the Cascades in Washington.
Habitat: Roadsides, lawns, waste ground to open woods in the lower mountains.
Origin: Introduced
Flowers: June - September
Holcus molliscreeping softgrass, creeping velvet-grass
Origin: Introduced
ssp. mollis – creeping velvet grass
Holodiscus discolorcreambush ocean-spray, hillside oceanspray
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to south California, east to the Rocky Mountains.
Habitat: Gravelly soil in open, dry to moist woods, coastal bluffs to moderate elevations in the mountains.
Origin: Native
Flowers: June-August
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 peploides
Distribution: Occuring along the coast in Washington; Alaska south to northern Oregon, northeastern North America and Greenland.
Habitat: Coastal beaches and sand dunes.
Origin: Native
Flowers: May-September
ssp. major – sea purslane
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: Chiefly west of the Cascades and towards the south in Washington; south to southern 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: From southwest Washington south, on the west side of the Cascades and in the Coast Ranges, to Monteray County, 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: Northwest Washington south to central California, east along rivers to Idaho.
Habitat: Moist soil.
Origin: Native
Flowers: May - July
Hosackia rosearosy bird's-foot-trefoil
Distribution: West of the Cascades in Washington; Washington south 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
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 ×massartianahybrid bluebell
Distribution: Occurring west of the Cascades crest in Washington;
Habitat: Meadows, fields, grassy balds, and other open areas at low elevations.
Origin: Introduced
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: Mostly east of the Cascade summits in Washington; British Columbia south to California, east to Colorado.
Habitat: Somewhat moist open slopes and woodlands, foothills to mid-elevations in the mountains.
Origin: Native
Flowers: March-July
var. capitatum – wool breeches, ballhead waterleaf
var. thompsonii – wool breeches, 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: West of the Cascades in Washington; Vancouver Island, British Columbia south to California.
Habitat: Moist woods at lower elevations.
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 calycinumrose-of-sharon
Distribution: West of the Cascades in Washington at low elevations.
Habitat: Escaped from cultivation in disturbed, urban settings.
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, false dandelion
Distribution: Occurring west of the Cascades crest in Washington; British Columbia south to California; central and eastern U.S.
Habitat: Rocky balds, disturbed meadows, wasteland areas, especially in sandy soil.
Origin: Introduced from Europe
Flowers: May-June
Hypochaeris radicatahairy cat's ear, rough cat's ear
Distribution: Widely distributed on both sides of the Cascades crest in Washington; Alaska south to California, east to the Rocky Mountains; from the midwestern U.S. to the Atlantic Coast.
Habitat: Disturbed areas, grassy balds, prairies, grasslands, lawns, and roadsides.
Origin: Introduced from Europe
Flowers: May-October
Hyssopus officinalis
Origin: Introduced