Vascular Plants

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


Browse by scientific name:

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Scientific names beginning with T:
Taeniatherum caput-medusaemedusa-head
Distribution: Sparingly introduced in east-central Washington; more common on both sides of the Cascades in Oregon, east into southeast Idaho and south into California.
Habitat: Weed of waste ground.
Origin: Introduced
Flowers: May - June
Tamarix parviflorasmall-flower tamarisk
Distribution: Chiefly east of the Cascades in Washington; distributed widely througout western and central U.S., scattered localities in eastern U.S.
Habitat: Mostly in riparian areas in arid regions.
Origin: Introduced from Europe
Flowers: May-June
Tamarix ramosissimanoxious tararisk
Distribution: Chiefly east of the Cascades in Washington; widespread across the central and western U.S., scattered location in U.S. east of the Mississippi River.
Habitat: Riparian zones and other moist to wet areas in arid regions.
Origin: Introduced from Europe
Flowers: June-August
Tanacetum balsamitacostMary
Distribution: Introduced and escaped over much of the United States; not common in the Pacific Northwest.
Habitat: Roadsides and other waste places.
Origin: Introduced
Flowers: August - September
Tanacetum bipinnatumcamphor tansy, dune tansy
Distribution: British Columbia to northern California.
Habitat: Sand dunes along the coast.
Origin: Native
Flowers: June - September
Tanacetum partheniumfeatherfew, feverfew
Distribution: Scattered locations throughout Washington; introduced in most of the western and eastern United States; escaped from gardens.
Habitat: Waste places.
Origin: Introduced from Europe
Flowers: June-September
Tanacetum vulgarecommon tansy
Distribution: Widely distributed throughout Washington; widely distributed throughout North America.
Habitat: Roadsides and waste ground, often cultivated and escaped
Origin: Introduced from Europe
Flowers: July-October
Taraxacum ceratophorumhorned dandelion
Origin: Native
Taraxacum erythrospermumred-seeded dandelion
Distribution: Occurring on both sides of the Cascades crest in Washington; widely distributed throughout much of North America.
Habitat: Meadows, grasslands, prairies, and other open areas, typically where some level of disturbance present.
Origin: Introduced
Flowers: April-October
Taraxacum officinalecommon dandelion
Distribution: Occurring throughout Washington; introduced throughout North America.
Habitat: Common in disturbed areas, fields, lawns, from the coast to the alpine.
Origin: Introduced from Europe
Flowers: March-October
Taraxia subacaulislong-leaf evening primrose
Distribution: Occurring east of the Cascades in Washington; Washington south to California, east to Montana and Colorado.
Habitat: Meadows, benchland, and stream banks, from sagbrush plains to moderate elevations in the mountains, usually where dry by late summer.
Origin: Native
Flowers: April-July
Taraxia tanacetifoliatansy-leaf evening primrose
Distribution: East of the Cascades, Washington to California, east to Idaho and Nevada
Habitat: Dry, often sandy or gravelly ground, low to moderate elevations
Origin: Native
Flowers: June - August
Tauschia stricklandiiStrickland's tauschia, Strickland's umbrella-wort
Distribution: At 5000 to 6500 feet elevation, Mt. Rainier and Twin Sisters Lakes area of Yakima County.
Habitat: Stream banks, moist meadows and slopes.
Origin: Native
Flowers: August
Taxus baccataEnglish yew
Origin: Introduced from Europe
Taxus brevifoliaPacific yew, western yew
Distribution: Alaska to California, east to northern Idaho and northeast Oregon
Habitat: Open to deep, usually moist forests, sea level to mid-elevations in the mountains
Origin: Native
Cones: September - October
Teesdalia nudicaulisshepherd's cress
Distribution: Introduced west of the Cascades in Washington; British Columbia south to California and in northeastern U.S.
Habitat: Sandy or gravelly soil at low elevations.
Origin: Introduced from Europe
Flowers: April-May
Tellima grandiflorafragrant fringecup
Distribution: Occurring chiefly west of the Cascades crest in Washington, occasionally east to northeast Washington and in the Columbia River Gorge; Alaska south to California.
Habitat: Common in damp woods and along streams, sea level to moderate elevations in the mountains.
Origin: Native
Flowers: April-July
Tetradymia canescensgray horsebrush, spineless horsebrush
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
Teucrium canadensewestern germander
Distribution: East of the Cascades in Washington; throughout the United States and adjacent portions of Canada and Mexico.
Habitat: Stream banks and moist bottom lands, mostly at low elevations.
Origin: Native
Flowers: June-August
var. occidentale – Germander
Thalictrum dasycarpumpurple meadow-rue
Distribution: Occurring in the northeastern corner of Washington; Alberta south to Arizona, east to central North America.
Habitat: Meadowlands and moist woods.
Origin: Native
Flowers: May-July
Thalictrum occidentalewestern meadow rue
Distribution: Occurring on both sides of the Cascades in Washingtton; British Columbia south to northern California, east to Montana and Colorado.
Habitat: Shady woodlands and forests, from low elevations to mid-elevations in the mountains.
Origin: Native
Flowers: May-August
Thalictrum venulosumveiny-leaf meadow-rue
Distribution: Occurring east of the Cascades crest in Washington; Yukon Territory to Nevada, east to eastern North America, south to New Mexico.
Habitat: Riparian areas, coniferous forest understory.
Origin: Native
Flowers: June-July
Thelypodium howelliiHowell's thelypody
Origin: Native
Flowers: May - July
ssp. howellii – Howell's thelypody
Thelypodium integrifoliumentire-leaved thelypody
Distribution: Okanogon County, Washington, south to central Oregon and Nevada, east to Montana and Colorado.
Habitat: Sagebrush plains to streambanks in the lower mountains.
Origin: Native
Flowers: June - August
ssp. integrifolium – entire-leaved thelypody
Thelypodium laciniatumcut-leaf thelypody, thick-leaved thelypody
Distribution: East of the Cascades in Washington; British Columbia to California, east to Idaho and Nevada.
Habitat: Rock cliffs and dry, rocky areas.
Origin: Native
Flowers: April-July
Thelypodium milleflorummany flowered thelypody
Distribution: Occurring east of the Cascades crest in Washington, chiefly near the Columbia River; Washington south to Nevada, east to Idaho.
Habitat: Rock cliffs and dry, rocky areas.
Origin: Native
Flowers: April-July
Thelypodium sagittatumslender thelypody
Origin: Native
Flowers: June - July
ssp. sagittatum – sagittate thelypody, slender thelypody
Thermopsis montanamountain buck-bean, mountain golden-banner, mountain golden-pea, mountain thermopsis
Distribution: Occurring on both sides of the Cascades in Washington; British Columbia south to California, east to the Rockies of Montana and Colorado.
Habitat: Sandy, well-drained soil to wet meadowland, low to moderate elevations.
Origin: Native
Flowers: May-August
var. montana – Hitchcock's thermopsis, mountain thermopsis
var. ovata – slender goldenbanner
Thinopyrum intermediumintermediate wheatgrass
Origin: Introduced
Flowers: June - August
ssp. barbulatum – pubescent wheatgrass
ssp. intermedium – intermediate wheatgrass
Thinopyrum ponticumEurasian quack grass
Distribution: Occurring in scattered locations in the southern portion of Washington; British Columbia south to California, east to the central portion of North America.
Habitat: Disturbed areas including roadsides, wastelots, and agricultural fields.
Origin: Introduced
Flowers: May-June
Thlaspi arvensefanweed, field pennycress
Distribution: Distributed widely throughout Washington; widely introduced throughout North America.
Habitat: Weed of waste ground, low to moderate elevations.
Origin: Introduced from Europe
Flowers: April-August
Thuja plicatacanoe cedar, western red cedar
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska south to northern California, east to Alberta, Idaho, and Montana.
Habitat: Moist or swampy areas from sea level to mid-elevations in the mountains.
Origin: Native
Cones: Producing cones in April-May
Thymelaea passerinamezereon
Origin: Introduced
Thymus pulegioideslemon thyme
Origin: Introduced from Europe
Thymus serpyllum
Origin: Introduced
Thysanocarpus curvipessand fringepod, lacepod
Distribution: Chiefly east of the Cascades in Washington; British Columbia south to California, east to Idaho.
Habitat: Uncommon on dry, open hillsides and borders of woodlands.
Origin: Native
Flowers: April-June
Tiarella trifoliata
Distribution: Widely distributed throughout the forested areas of Washington; Alaska south to California, east to Alberta, Idaho and Montana.
Habitat: Moist woods and stream banks, sea level to mid-elevations in the mountains.
Origin: Native
Flowers: May-August
var. laciniata – cut-leaved foamflower
var. trifoliata – three-leaf foamflower
var. unifoliata – simple-leaved foamflower
Tilia cordatasmall-leaved linden
Origin: Introduced
Tilia platyphyllos
Origin: Introduced
Tiquilia nuttalliicoldenia, rosette crinklemat, rosette tequilia
Distribution: Occurring east of the Cascades crest in Washington; Washington south to California, east to Utah.
Habitat: Sagebrush plains.
Origin: Native
Flowers: May-August
Tolmiea menziesiipiggyback-plant
Distribution: Occurring chiefly west of the Cascades crest in Washington; Alaska south to California.
Habitat: Moist woods and stream banks, low lands and low elevations in the mountains.
Origin: Native
Flowers: May-August
Tonella floribundagreater baby-innocence, large-flowered tonella
Distribution: Occurring along the southern border of Washington; Canyon of the Snake River and tributaries; Washington south to Oregon, east to Idaho.
Habitat: Open, often rocky places, at low elevations.
Origin: Native
Flowers: April-June
Tonella tenellalesser baby-innocence, small-flowered tonella
Distribution: Along the Columbia River from the east end of the gorge to the coast, south in the Puget Trough to central California.
Habitat: Fairly moist in open to partly shaded places at low elevations.
Origin: Native
Flowers: March-May
Tonestus lyalliiLyall's goldenweed, Lyall's serpentweed
Distribution: Occurring in the Olympics and Cascades mountains in Washington; British Columbia south to California, east to Alberta, south to Colorado.
Habitat: Mountain meadows and rocky slopes, alpine and subalpine.
Origin: Native
Flowers: July-September
Torilis arvensisfield hedge-parsley
Distribution: Introduced in scattered locations in the Pacific Northwest, mostly west of the Cascades.
Habitat: Weed of disturbed ground.
Origin: Introduced
Flowers: July - September
Torilis japonica
Origin: Introduced
Torreyochloa pallidapale false manna grass
Distribution: Alaska south along the coast to California, east to Alberta and New Mexico.
Habitat: Wet places, from near sea level to 11,000 feet elevation in mountain meadows.
Origin: Native
Flowers: June - August
var. pauciflora – weak alkaligrass
Townsendia florifershowy Townsend-daisy, showy townsendia
Distribution: Occurring east of the Cascades crest in Washington; Washington south to Oregon and Nevada, east to the Rocky Mountains.
Habitat: Dry-open places in the plains and foothills, often with sagebrush.
Origin: Native
Flowers: May-July
Toxicodendron diversilobumPacific poison-oak
Distribution: Mainly west of the Cascades in Washington; British Columbia south to California, east to Nevada.
Habitat: Open woods at low elevations.
Origin: Native
Flowers: April-July
Toxicodendron radicanswestern poison ivy
Distribution: Occurring east of the Cascades crest in Washington; throughout much of North America, except Alaska, California, southeastern U.S. and northeastern Canada.
Habitat: Generally in the lowlands and foothills and into the lower mountains in open areas or forest edges.
Origin: Native
Flowers: April-July
var. rydbergii – poison-ivy, western poison-ivy
Toxicoscordion paniculatumpanicled death camas, sand corn
Distribution: East of the Cascades crest in Washington; Washington south to California, east to Montana and Arizona.
Habitat: Common in sagebrush desert to ponderosa or lodgepole pine forests.
Origin: Native
Flowers: March-June
Toxicoscordion venenosummeadow death-camas, deadly zygadene
Distribution: Occurring on both sides of the Cascades crest in Washington; southern British Columbia to California, east to the Rocky Mountains and western Great Plains.
Habitat: Grasslands, balds, prairies, and open pine woods from the coast to moderate elevations.
Origin: Native
Flowers: April-June
var. gramineum – common death camas, grassy death camas
var. venenosum – coastal death camas
Tragopogon dubiusmeadow goatsbeard, yellow salsify
Distribution: Occurring chiefly east of the Cascades crest in Washington; widely distributed throughout most of North America.
Habitat: Drier areas at low to mid-elevations.
Origin: Introduced from Europe
Flowers: May-Juyly
Tragopogon floccosuswoolly goatsbeard
Distribution: Known only from Whitman County in Washington.
Habitat: Disturbed areas, fields, roadsides.
Origin: Introduced
Flowers: July-August
Tragopogon mirusremarkable goatsbeard
Distribution: Known only from one colony at Pullman, Washington, and another at nearby Palouse.
Habitat: Dry, open areas in the foothills.
Origin: Native
Tragopogon miscellushybrid goatsbeard
Origin: Native
Tragopogon porrifoliusoyster plant, purple salsify
Distribution: Occurring on both sides of the Cascades crest in Washington; widely distributed throughout most of North America.
Habitat: Roadsides, fields and waste places, usually where moist.
Origin: Introduced from Europe
Flowers: April-August
Tragopogon pratensisjack go to bed at noon, meadow salsify
Distribution: Widely distributed throughout Washington; widely distributed throughout North America.
Habitat: Roadsides, fields and waste places, usually in slightly moist areas.
Origin: Introduced
Flowers: May-August
Trautvetteria caroliniensisfalse bugbane, wild bugbane
Distribution: Widely distributed throughout Washington; British Columbia south to California, east across Canada and the U.S. to the Atlantic Coast.
Habitat: Moist, open woods and stream banks, low to mid-elevations in the mountains.
Origin: Native
Flowers: May-August
Triadenum fraserimarsh St. John's-wort
Origin: Introduced from eastern North America
Triantha occidentaliswestern tofieldia
Distribution: Occurring in the Olympic and Cascade mountains in Washington; British Columbia south to California.
Habitat: Moist meadows, bogs and streambanks, mid- to high elevations in the mountains.
Origin: Native
Flowers: June-August
ssp. brevistyla – sticky asphodel, sticky tofieldia
Tribulus terrestrispuncture vine
Distribution: East of the Cascades crest in Washington; widely distributed throughout much of North America.
Habitat: Noxious weed of sandy soils and roadsides.
Origin: Introduced
Flowers: May-September
Trichophorum cespitosumtufted clubrush
Distribution: Circumboreal, extending south in North America chiefly west of the Cascades to central Oregon; also in North Carolina, Utah and Idaho.
Habitat: Sphagnum bogs, marshes, and other very wet places.
Origin: Native
Flowers: July - August
Trichostema lanceolatumvinegar weed
Origin: Native
Trichostema oblongummountain bluecurls
Distribution: East of the Cascades in Washington; adjacent Idaho, east through the Columbia River Gorge to the Wilamette Valley of Oregon, and south to California.
Habitat: Moist, open places, often on disturbed soil.
Origin: Native
Flowers: July-August
Trifolium albopurpureumRancheria clover, rancheria clover
Distribution: Known from only a few scattered locations in Washington; Washington south to California, east to Arizona.
Habitat: Coastal bluffs to forest openings at middle elevations.
Origin: Native
Flowers: May-June
Trifolium arvenserabbit-foot clover, hare's foot
Distribution: Introduced chiefly west of the Cascades in Washington; British Columbia south to Oregon.
Habitat: Uncommon in waste places and roadsides.
Origin: Introduced
Flowers: May-July
Trifolium aureumgolden clover, greater hop clover, yellow clover
Distribution: Occurring in scattered locations on both sides of the Cascades crest in Washington; Alaska south to California, east to Montana and Wyoming; also occurring in most of eastern North America.
Habitat: Roadsides, railways and waste places.
Origin: Introduced
Flowers: June-September
Trifolium bifidumnotch-leaf clover, pinole clover
Origin: Native
Flowers: April - June
Trifolium campestrehop clover
Distribution: Distributed chiefly west of the Cascades in Washington; distributed widely throughout North America.
Habitat: Wastelands, roadsides, meadows, and other disturbed areas.
Origin: Introduced
Flowers: May-August
Trifolium cernuumnodding clover
Origin: Introduced
Trifolium ciliolatumfoothill clover, tree clover
Distribution: Southern Washington south to Baja California west of the Cascades and Sierra Nevada, at elevations of up to several thousand feet in the south.
Habitat: Wet meadows to rather dry, sandy soil.
Origin: Native
Flowers: April - June
Trifolium cyathiferumbowl clover, cup clover
Distribution: Occurring chiefly east of the Cascades in Washington; British Columbia south to California.
Habitat: Uncommon in wet meadows to fairly dry, sandy soil, at moderate elevations.
Origin: Native
Flowers: May-July
Trifolium depauperatumpoverty clover
Distribution: Central Oregon to southern California; sporadic and possibly always introduced in Washington and Vancouver Island, British Columbia.
Habitat: Open areas at low elevations.
Origin: Native
Flowers: April - June
var. depauperatum – poverty clover
Trifolium dichotomumbranched Indian clover
Distribution: Occurring in the San Juan Islands in Washington; Willamette Valley, OR south to California.
Habitat: Open forest, sandy embankments, and grassy balds on islands.
Origin: Native
Flowers: April-June
Trifolium douglasiiDouglas' clover
Distribution: Known from Garfield, Spokane, and Whitman counties in Washington; eastern Washington south to east-central Oregon, east to eastern Idaho; disjunct in sw Oregon.
Habitat: Moist to wet areas in including open meadows, forested wetlands, and streambanks.
Origin: Native
Flowers: June-July
Trifolium dubiumleast hop clover, suckling clover
Distribution: Occurring on both sides of the Cascades crest in Washington; widely distributed throughout much of North America.
Habitat: Disturbed areas including forest openings, meadows, wastelots, roadsides, and lawns.
Origin: Introduced
Flowers: April-September
Trifolium eriocephalumwoolly-head clover
Distribution: Cascades from southern Washington to Northern California, east to Nevada, Utah and Montana
Habitat: Moderate to mid-elevations in the mountains
Origin: Native
Flowers: May - July
var. arcuatum – woolly-head clover
var. eriocephalum – woolly-head cloover
Trifolium fragiferumstrawberry clover
Distribution: Introduced and occasionally established in Washington, Oregon and Idaho; more common in eastern United States.
Habitat: Waste places, disturbed soil.
Origin: Introduced
Flowers: April - July
Trifolium fucatumsour clover
Origin: Introduced
Trifolium glomeratumclustered clover
Origin: Introduced
Trifolium gracilentumslender clover
Origin: Native
Flowers: April - June
Trifolium hirtumrose clover
Origin: Introduced
Trifolium hybridumAlsike clover
Distribution: Introduced in Western United States
Habitat: Near cultivated fields and roadsides
Origin: Introduced
Flowers: April - September
Trifolium incarnatumcrimson clover
Distribution: Introduced, occasionally established in western Washington and Oregon.
Habitat: Wasteland, pastures, disturbed soil.
Origin: Introduced
Flowers: May - June
Trifolium latifoliumtwin clover
Distribution: Wallowa County, Oregon to Missoula, Montana.
Habitat: Moist meadows to rocky ridges.
Origin: Native
Flowers: June - August
Trifolium longipeslong-stalked clover
Distribution: Common on both sides of the Cascades in Washington; British Columbia south to California, east to the Rocky Mountains.
Habitat: Meadows and valleys, lower mountains to subalpine slopes.
Origin: Native
Flowers: May-August
var. longipes – long-stalked clover
var. multiovulatum – long-stalked clover
var. multipedunculatum – long-stalked clover
var. reflexum – long-stalked clover
Trifolium macrocephalumbig-head clover, large-head clover
Distribution: Occurring east of the Cascades crest in Washington; Washington, south through eastern Oregon, east to Idaho and Nevada.
Habitat: Shrub-steppe, sagebrush desert and ponderosa pine woodlands.
Origin: Native
Flowers: April-June
Trifolium microcephalumsmall-head clover
Distribution: Distributed widely throughout Washington; British Columbia to Baja California, east to Montana and Arizona.
Habitat: Moist meadows, sandy riverbanks and drier hillsides, coastal to mid-elevations in the mountains.
Origin: Native
Flowers: April-June
Trifolium microdonthimble clover, Valparaiso clover
Distribution: Chiefly west of the Cascades in Washington; British Columbia south to California.
Habitat: In meadows or on rocky or sandy soil at low elevations.
Origin: Native
Flowers: April-June
Trifolium oliganthumfew-flowerered clover
Distribution: West of the Cascades, from southwest British Columbia to California.
Habitat: Meadowland to dry, rocky soil at low elevations.
Origin: Native
Flowers: March-July
Trifolium plumosumplumed clover
Origin: Native
Flowers: May - August
var. amplifolium – plumed clover
var. plumosum – plumed clover
Trifolium pratensered clover
Distribution: Introduced throughout the United States; common forage crop in the Pacific Northwest
Habitat: Escaped from cultivation; found along mountain trails where horses have been used
Origin: Introduced
Flowers: June - August
Trifolium repensDutch clover, white clover
Distribution: Widely distributed throughout Washington; widely distributed throughout North America.
Habitat: Established in a variety of native habitats, such as mountain meadows
Origin: Introduced
Flowers: April-September
Trifolium resupinatumreversed clover
Origin: Native
Trifolium retusumteasel clover
Origin: Introduced
Trifolium striatumknotted clover
Origin: Introduced
Trifolium subterraneumburrowing clover
Distribution: Chiefly west of the Cascades in Washington; British Columbia south to California; southeastern U.S.
Habitat: Pastures, prairies, roadsides and other open, disturbed areas at low elevations.
Origin: Introduced
Flowers: April-June
Trifolium suffocatumsuffocated clover
Origin: Introduced
Trifolium thompsoniiThompson's clover
Distribution: Swakane Canyon, Chelan County, Washington, north to Entiat Valley, and in Douglas County opposite Swakane Canyon.
Habitat: Common on dry, grassy hillsides just below the ponderosa pine woodlands
Origin: Native
Flowers: May - June
Trifolium variegatumwhite-tip clover
Distribution: Widely distributed throughout much of Washington; Alaska south to California, east towards the Rocky Mountains.
Habitat: Dry, sandy soil to moist meadows.
Origin: Native
Flowers: April-July
Trifolium vesiculosumarrow-leaf clover
Distribution: Occurring in a few locations in lowland western Washington; Washington south to California; also in the south-central and southeastern U.S.
Habitat: Disturbed areas in including wastelots, roadsides, and fields.
Origin: Introduced
Trifolium willdenoviisand clover, springbank clover, tomcat clover
Distribution: West side of the Cascades and east along the Columbia River in Washington; British Columbia south to California.
Habitat: Grassy hillsides, balds, prairies and meadows at low to moderate elevations.
Origin: Native
Flowers: April-July
Trifolium wormskioldiicow clover, salt marsh clover
Distribution: Alaska to California, east to Montana and New Mexico; more common west of the Cascades in Washington
Habitat: Costal dunes to moist meadows and stream banks at low to moderate elevations in the mountains
Origin: Native
Flowers: May - September
Triglochin concinnagraceful arrow-grass
Origin: Native
Triglochin maritimaseaside arrow-grass
Distribution: Widely distributed throughout much of Washington; Alaska south to California, east to the Rocky Mountains, then mostly across northern U.S. and southern Canada to the Atlantic Coast.
Habitat: Marsh to moist, gravelly areas, mostly were saline or alkaline.
Origin: Native
Flowers: May-August
Triglochin palustrismarsh arrow-grass
Origin: Native
Flowers: June - August
Triglochin scilloidesflowering quillwort
Origin: Native
Triglochin striata
Origin: Native
Trillium albidumgiant trillium, sessile trillium
Origin: Native
ssp. parviflorum – small-flowered trillium
Trillium ovatumtrillium, white trillium, western wake-robin
Distribution: Widely distributed in the forested areas of Washington; British Columbia south to California, east to Montana and Idaho; also in Colorado and Wyoming.
Habitat: Open to dense moist forests at low to mid-elevations, often where boggy in the spring.
Origin: Native
Flowers: March-June
var. ovatum – wakerobin
Trillium petiolatumpurple trillium, purple wakerobin
Distribution: East of the Cascades crest in Washington; Washington south to northeastern Oregon, east to Idaho.
Habitat: Streambanks and moist meadows and thickets at low to moderate elevations.
Origin: Native
Flowers: April-June
Triodanis perfoliataclasping-leaf Venus'-looking-glass
Distribution: Both sides of the Cascades in Washington; throughout much of the United States and adjacent areas of Canada and Mexico.
Habitat: Various habitats, from the valleys and plains to moderate elevations in the moutains.
Origin: Native
Flowers: May-August
Triphysaria erianthabutter-and-eggs, Johnny-tuck owl-clover
Origin: Introduced as waif and/or cultivar from CA; occurrence based on records from late 1800s; no recent records or evidence of establishment in WA
ssp. eriantha – butter and eggs, johnny turk
Triphysaria pusilladwarf owl-clover
Distribution: West of the Cascades in Washington; British Columbia south to California.
Habitat: Vernally moist, open ground at low elevations.
Origin: Native
Flowers: April-June
Tripidium ravennaeravennagrass
Origin: Introduced
Triplasis purpureapurple sandgrass
Origin: Introduced
var. purpurea – purple sandgrass
Tripleurospermum inodorumfalse chamomile, false mayweed, scentless mayweed
Distribution: Occurring in scattered locations throughout Washington; widely distributed throughout northern 2/3 of North America.
Habitat: Noxious weed in fields and waste ground in eastern Washington
Origin: Introduced from Europe
Flowers: June-September
Trisetum canescenstall false oat
Origin: Native
Flowers: May - July
Trisetum cernuumnodding Trisetum
Origin: Native
Trisetum flavescensyellow false oat
Origin: Introduced
Trisetum spicatumnarrow false oat
Distribution: Alaska across Canada to Greenland, south through most of the mountains of western United States and the Appalachians.
Habitat: Montane forests to alpine slopes in rocky, dry or moist areas.
Origin: Native
Flowers: June - September
Triteleia grandiflorablue-lily, Douglas' brodiaea, blue umber lily, large-flowered tritelia
Distribution: Occurring chiefly east of the Cascades crest in Washington; British Columbia south to California, east to Montana, Idaho, Wyoming and Utah.
Habitat: Prairies, grasslands, balds and forest openings, often where seasonally dry, from the coast to moderate elevations in the mountains.
Origin: Native
Flowers: May-June
var. grandiflora – blue-lily, Douglas' brodiaea, blue umber lily, large-flowered tritelia
var. howellii – Howell's lily, Howell's triteleia
Triteleia hyacinthinawhite brodiaea, fool's-onion, wild hyacinth
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
Triticum aestivumbread wheat
Distribution: Introduced world-wide, but fails to persist more that a few seasons on its own.
Habitat: Cultivated in fields.
Origin: Introduced
Flowers: April - June
Trollius albifloruswestern globeflower
Distribution: Chiefly in the Olympics and Cascades mountains of Washington; British Columbia south to Washington, east to Montana, south to Colorado and Utah.
Habitat: Subalpine and alpine wet meadows and slopes, blooming as the snow recedes.
Origin: Native
Flowers: May-August
Tsuga heterophyllawestern hemlock
Distribution: Alaska to California, east to Montana, but much more common west of the Cascades
Habitat: Moist, deep forests from sea level to mid-elevations in the mountains
Origin: Native
Cones: May - June
Tsuga ×jeffreyi
Origin: Native
Tsuga mertensianamountain hemlock
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
Tulipa gesnerianacommon garden tulip
Origin: Introduced from Old World, exact origin unknown
Turgenia latifolia
Origin: Introduced
Turritis glabratower mustard
Distribution: Widely distributed throughout Washington; British Columbia south to northern California, east to the Rocky Mountain states.
Habitat: Seasonally moist, sometimes rocky, soil in open woods, clearings, and grassy balds.
Origin: Native
Flowers: May-July
Tussilago farfaracoltsfoot
Distribution: In scattered locations in western Washington; widespread in eastern North America.
Habitat: Waste ground, disturbed forest understory, and near areas of garden cultivation.
Origin: Introduced from Eurasia
Flowers: March-May
Typha angustifolianarrow-leaf cat-tail
Distribution: Chiefly along the Atlantic Coast of the United States, west to Missouri; occasional in Washington on both sides of the Cascades.
Habitat: Shallow, quiet to slow-moving water.
Origin: Introduced from Europe and/or eastern North America
Flowers: June - July
Typha domingensissouthern cat-tail
Origin: Introduced
Typha ×glauca
Origin: Introduced
Typha latifoliabroad-leaf cat-tail, common cattail
Distribution: Distributed widely throughout Washington; widely distributed throughout North America.
Habitat: Marshes, ponds and shallow slow-flowing water, sea level to mid-elevations in the mountains.
Origin: Native
Flowers: June-July