Vascular Plants

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

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69 common names
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Milk kelloggia (Kelloggia galioides)
Distribution: Occurring east of the Cascades crest in Washington; Washington to California, east to the Rocky Mountains.
Habitat: Forest openings, from middle elevations in the mountains to the subalpine.
Origin: Native
Flowers: June-August
Growth Duration: Perennial
Kenilworth-ivy (Cymbalaria muralis)
Distribution: Occurring west of the Cascades crest in Washington; British Columbia to California, scattered eastward across North America to the Atlantic Coast where more broadly distributed.
Habitat: Roadsides, retaining walls, wastelots, and other disturbed open areas at low elevation.
Origin: Introduced from Eurasia
Flowers: April-October
Growth Duration: Annual
Kindlingweed (Gutierrezia sarothrae)
Distribution: East of the Cascades in Washington, chiefly in southeastern part of state; Alberta to Manitoba, south to California and Texas.
Habitat: Dry, open places in the foothills, valleys and plains.
Origin: Native
Flowers: July-September
Growth Duration: Perennial
Yellow king devil (Hieracium caespitosum)
Distribution: Widely distributed on both sides of the Cascades crest in Washington; British Columbia to Oregon, east to Idaho, Montana, and Wyoming; also occurring throughout eastern North America.
Habitat: Moist pastures, forest openings, roadsides, and springs, from the lowlands to middle elevations in the mountains, usually where disturbed.
Origin: Introduced from Europe
Flowers: June-August
Growth Duration: Perennial
King's-cureall (Oenothera biennis)
Distribution: Occurring on both sides of the Cascades crest in Washington; widely distributed throughout much of North America.
Habitat: Meadows and stream banks, from the plains to the lower mountains, typically where disturbed.
Origin: Introduced from Europe
Flowers: June-August
Growth Duration: Biennial
Kinnikinnick (Arctostaphylos uva-ursi)
Distribution: Widely distributed on both sides of the Cascades crest in Washington; Alaska to California east to the Rocky Mountains, also further east across the northern U.S. and Canada to the Atlantic Coast; circumboreal.
Habitat: Coastal bluffs and prairies, rocky balds, dry subalpine meadows, and dry coniferous forest openings.
Origin: Native
Flowers: April-June
Growth Duration: Perennial
Feather-leaf kittentails (Veronica dissecta)
Distribution: Occurring in the Olympic Mountains in Washington, where disjunct; Idaho and Montana to Utah.
Habitat: Stony, subalpine to alpine slopes.
Origin: Native
Flowers: May-August
Growth Duration: Perennial
Fringe-petal kittentails (Veronica schizantha)
Distribution: Occurring in the Olympics and Cascades mountains foothills of western Washington; Washington to Oregon.
Habitat: Moist ground at mid-elevations in the mountains.
Origin: Native
Flowers: May-June
Growth Duration: Perennial
Fringed kittentails (Veronica schizantha)
Distribution: Occurring in the Olympics and Cascades mountains foothills of western Washington; Washington to Oregon.
Habitat: Moist ground at mid-elevations in the mountains.
Origin: Native
Flowers: May-June
Growth Duration: Perennial
Red kittentails (Veronica rubra)
Distribution: Occurring east of the Cascades crest in Washington; Washington to Oregon, east to Idaho and Montana.
Habitat: Open slopes and dry meadows in the lowlands and foothills.
Origin: Native
Flowers: April-May
Growth Duration: Perennial
Tailed kittentails (Veronica missurica)
Distribution: Occurring east of the Cascades crest and in the Columbia River Gorge in Washington; Washington to California, east to Idaho and Montana.
Habitat: Moist forest slopes.
Origin: Native
Flowers: March-May
Growth Duration: Perennial
Black knapweed (Centaurea nigra)
Distribution: Occurring on both sides of the Cascades crest and in the Columbia River Gorge in Washington; British Columbia to California, east to Montana, also Great Lakes region east to northeastern North America.
Habitat: Roadsides, fields, meadows, wastelots, and other disturbed, open areas.
Origin: Introduced from Europe
Flowers: July-September
Growth Duration: Perennial
Brown knapweed (Centaurea jacea)
Distribution: Occurring on both sides of the Cascades crest and in the Columbia River Gorge in Washington; British Columbia to California, east to the Rocky Mountains, also from the Great Lakes region east to the Atlantic Coast.
Habitat: Roadsides, fields, ditches, meadows, shores, wastelots, and other disturbed, open areas at low to middle elevations.
Origin: Introduced from Eurasia
Flowers: July-September
Growth Duration: Perennial
Brownray knapweed (Centaurea jacea)
Distribution: Occurring on both sides of the Cascades crest and in the Columbia River Gorge in Washington; British Columbia to California, east to the Rocky Mountains, also from the Great Lakes region east to the Atlantic Coast.
Habitat: Roadsides, fields, ditches, meadows, shores, wastelots, and other disturbed, open areas at low to middle elevations.
Origin: Introduced from Eurasia
Flowers: July-September
Growth Duration: Perennial
Creeping knapweed (Rhaponticum repens)
Distribution: Occurring east of the Cascades crest in Washington; British Columbia to California, east across most of North America to the Atlantic Coast.
Habitat: Disturbed dry slopes, meadows, fields, forest openings, and other disturbed, open places from low to middle elevations.
Origin: Introduced from central Asia
Flowers: June-September
Growth Duration: Perennial
Diffuse knapweed (Centaurea diffusa)
Distribution: Occurring on both sides of the Cascades crest in Washington; Yukon Territory to California, east across much of the U.S. and Canada to northeastern North America.
Habitat: Roadsides, fields, meadows, ditches, wastelots, and other disturbed, open areas; noxious.
Origin: Introduced from the eastern Mediterranean region
Flowers: July-September
Growth Duration: Annual, Perennial
Featherhead knapweed (Centaurea trichocephala)
Origin: Introduced
Growth Duration: Perennial
Globe knapweed (Centaurea macrocephala)
Distribution: Occurring east of the Cascades crest in Washington; central Washington to Montana, also in Colorado, and Great Lakes region to northeastern North America.
Habitat: Roadsides and meadows.
Origin: Introduced from Eurasia
Flowers: June-September
Growth Duration: Perennial
Hybrid diffuse knapweed (Centaurea ×varnensis)
Distribution: Occurring chiefly east of the Cascades crest in Washington; British Columbia to Oregon, east to Idaho; also in eastern North America.
Habitat: Roadsides, fields, ditches, wastelots, and other disturbed, open areas at low to middle elevations.
Origin: Introduced from Europe
Flowers: June-August
Growth Duration: Annual, Perennial
Hybrid knapweed (Centaurea ×gerstlaueri)
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to California, east to Idaho and Montana; also in eastern North America.
Habitat: Roadsides, fields, ditches, meadows, wastelots, and other disturbed open areas at low to middle elevations.
Origin: Introduced from Europe
Flowers: June-September
Growth Duration: Perennial
Iberian knapweed (Centaurea iberica)
Distribution: Occurring east of the Cascades crest in Washington; Washington to California, also in Wyoming and Kansas.
Habitat: Roadsides, fields, dry meadows, ditches, wastelots, and other disturbed, open areas at low to middle elevations.
Origin: Introduced from Eurasia
Flowers: June-August
Growth Duration: Perennial
Lesser knapweed (Centaurea nigra)
Distribution: Occurring on both sides of the Cascades crest and in the Columbia River Gorge in Washington; British Columbia to California, east to Montana, also Great Lakes region east to northeastern North America.
Habitat: Roadsides, fields, meadows, wastelots, and other disturbed, open areas.
Origin: Introduced from Europe
Flowers: July-September
Growth Duration: Perennial
Meadow knapweed (Centaurea ×gerstlaueri)
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to California, east to Idaho and Montana; also in eastern North America.
Habitat: Roadsides, fields, ditches, meadows, wastelots, and other disturbed open areas at low to middle elevations.
Origin: Introduced from Europe
Flowers: June-September
Growth Duration: Perennial
Protean knapweed (Centaurea ×gerstlaueri)
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to California, east to Idaho and Montana; also in eastern North America.
Habitat: Roadsides, fields, ditches, meadows, wastelots, and other disturbed open areas at low to middle elevations.
Origin: Introduced from Europe
Flowers: June-September
Growth Duration: Perennial
Russian knapweed (Rhaponticum repens)
Distribution: Occurring east of the Cascades crest in Washington; British Columbia to California, east across most of North America to the Atlantic Coast.
Habitat: Disturbed dry slopes, meadows, fields, forest openings, and other disturbed, open places from low to middle elevations.
Origin: Introduced from central Asia
Flowers: June-September
Growth Duration: Perennial
Sand knapweed (Centaurea ×varnensis)
Distribution: Occurring chiefly east of the Cascades crest in Washington; British Columbia to Oregon, east to Idaho; also in eastern North America.
Habitat: Roadsides, fields, ditches, wastelots, and other disturbed, open areas at low to middle elevations.
Origin: Introduced from Europe
Flowers: June-August
Growth Duration: Annual, Perennial
Short fringed knapweed (Centaurea nigrescens)
Distribution: Occurring in scattered locations on both sides of the Cascades crest in Washington; British Columbia to California, east to Montana and Wyoming, also from Great Lakes region east to northeastern North America.
Habitat: Roadsides, fields, ditches, wastelots, and other disturbed, open areas.
Origin: Introduced from Europe
Flowers: July-September
Growth Duration: Perennial
Spotted knapweed (Centaurea stoebe)
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to California, east across North America to the Atlantic Coast.
Habitat: Forest openings, meadows, fields, roadsides, wastelots, and other disturbed open areas from low to middle elevations.
Origin: Introduced from Europe
Flowers: June-October
Growth Duration: Perennial
Tumble knapweed (Centaurea diffusa)
Distribution: Occurring on both sides of the Cascades crest in Washington; Yukon Territory to California, east across much of the U.S. and Canada to northeastern North America.
Habitat: Roadsides, fields, meadows, ditches, wastelots, and other disturbed, open areas; noxious.
Origin: Introduced from the eastern Mediterranean region
Flowers: July-September
Growth Duration: Annual, Perennial
Tyrol knapweed (Centaurea nigrescens)
Distribution: Occurring in scattered locations on both sides of the Cascades crest in Washington; British Columbia to California, east to Montana and Wyoming, also from Great Lakes region east to northeastern North America.
Habitat: Roadsides, fields, ditches, wastelots, and other disturbed, open areas.
Origin: Introduced from Europe
Flowers: July-September
Growth Duration: Perennial
White knapweed (Centaurea diffusa)
Distribution: Occurring on both sides of the Cascades crest in Washington; Yukon Territory to California, east across much of the U.S. and Canada to northeastern North America.
Habitat: Roadsides, fields, meadows, ditches, wastelots, and other disturbed, open areas; noxious.
Origin: Introduced from the eastern Mediterranean region
Flowers: July-September
Growth Duration: Annual, Perennial
Annual knawel (Scleranthus annuus)
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to California, east to Saskatchewan, Montana, and Idaho; also from the central U.S. to eastern North America.
Habitat: Disturbed soils, waste lots, and cultivated areas.
Origin: Introduced from Europe
Flowers: April-July
Growth Duration: Annual
Doubtful knight's-spur (Delphinium ajacis)
Distribution: Limited in distribution to a few localities west of the Cascades in Washington; widely distributed throughout much of North America.
Habitat: Drainage ditches, roadsides, old home sites, waste areas.
Origin: Introduced
Flowers: June-July
Growth Duration: Annual
Knoke's lomatium (Lomatium knokei)
Distribution: Occurring east of the Cascades crest, where endemic to Kittitas County.
Habitat: Open, vernally wet, gently sloping meadows of fine-textured clay soils at approximately 1200 meters.
Origin: Native
Flowers: May-June
Growth Duration: Perennial
Knotgrass (Paspalum distichum)
Distribution: Occurring chiefly along the lower Columbia River corridor in Washington; British Columbia to California, east across most of North America to the Atlantic Coast.
Habitat: Along ditches and streams where the soil is moist much of the season.
Origin: Native
Flowers: August-October
Growth Duration: Perennial
Austin's knotweed (Polygonum austiniae)
Distribution: Occurring east of the Cascades crest in Washington; British Columbia to California, east to Alberta and Wyoming.
Habitat: Dry to moist banks and flats, from sagebrush plains to lower mountains, often with ponderosa pine.
Origin: Native
Flowers: June-August
Growth Duration: Annual
Beach knotweed (Polygonum paronychia)
Distribution: Occurring west of the Cascades crest along the coast; Vancouver Island, B.C., south to Monterey, California.
Habitat: Coastal shorelines and sand dunes.
Origin: Native
Flowers: April-September
Growth Duration: Perennial
Black knotweed (Polygonum paronychia)
Distribution: Occurring west of the Cascades crest along the coast; Vancouver Island, B.C., south to Monterey, California.
Habitat: Coastal shorelines and sand dunes.
Origin: Native
Flowers: April-September
Growth Duration: Perennial
Blake's knotweed (Polygonum achoreum)
Distribution: Reported for Washington, but specimen from Pierce County is likely a misidentification; Alaska to Oregon and Nevada, east across North America to the Atlantic Coast.
Habitat: Disturbed areas.
Origin: Native
Flowers: May-July
Growth Duration: Annual
Bohemian knotweed (Fallopia ×bohemica)
Distribution: Occurring chiefly west of the Cascades crest in Washington; Alaska to Oregon, east to Montana, and in scattered locations across North America.
Habitat: Riparian zones, roadsides, ditches, wastelots, and other disturbed open areas generally at low elevations.
Origin: Introduced from eastern Asia
Flowers: July-October
Growth Duration: Perennial
Branched knotweed (Polygonum ramosissimum)
Distribution: Occurring chiefly east of the Cascades crest in Washington; British Columbia to California, east across North America to the Atlantic Coast.
Habitat: Disturbed areas, often where wet, from low to middle elevations.
Origin: Native
Flowers: July-September
Growth Duration: Annual
California knotweed (Polygonum californicum)
Distribution: Occurring in the east end of the Columbia River Gorge in Washington; south-central Washington to California.
Habitat: Dry rocky slopes, gravelly ground at low elevations.
Origin: Native
Flowers: May-July
Growth Duration: Annual
Common knotweed (Polygonum aviculare)
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east across North America to the Atlantic Coast.
Habitat: Dry or slightly moist, disturbed soil, often where hard-packed.
Origin: Both native and introduced
Flowers: May-October
Growth Duration: Annual
Davis' knotweed (Aconogonon davisiae)
Distribution: Occurring on both sides of the Cascades crest in Washington; Washington to California.
Habitat: Slopes and ridges in the subalpine and alpine.
Origin: Native
Flowers: June-September
Growth Duration: Perennial
Davis's knotweed (Aconogonon davisiae)
Distribution: Occurring on both sides of the Cascades crest in Washington; Washington to California.
Habitat: Slopes and ridges in the subalpine and alpine.
Origin: Native
Flowers: June-September
Growth Duration: Perennial
Dotted knotweed (Persicaria punctata)
Distribution: Occurring chiefly east of the Cascades crest in Washington; British Columbia to California, east to the Atlantic Coast.
Habitat: Lake and pond shores, marshes, and wet forests.
Origin: Native
Flowers: June-September
Growth Duration: Annual, Perennial
Douglas' knotweed (Polygonum douglasii)
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to California, east to the Rocky Mountains and across the northern U.S. and Canada to the Atlantic Coast.
Habitat: Common in dry to moist areas, lowlands to middle elevations in the mountains.
Origin: Native
Flowers: June-September
Growth Duration: Annual
Douglas's knotweed (Polygonum douglasii)
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to California, east to the Rocky Mountains and across the northern U.S. and Canada to the Atlantic Coast.
Habitat: Common in dry to moist areas, lowlands to middle elevations in the mountains.
Origin: Native
Flowers: June-September
Growth Duration: Annual
Erect knotweed (Polygonum erectum)
Distribution: Occurring on both sides of the Cascades crest in Washington; Washington to Oregon and Nevada, east from the Rocky Mountains and northern Great Plains to the Altantic Coast.
Habitat: Dry, disturbed ground.
Origin: Native
Flowers: June-September
Growth Duration: Annual
Fall knotweed (Polygonum spergulariiforme)
Distribution: Occurring west of the Cascades crest and east in the Columbia River Gorge in Washington; British Columbia to California, east to Idaho, Montana, and Wyoming.
Habitat: Balds, prairies, and headlands in gravelly, sandy or heavy, dry or moist soil at low elevations.
Origin: Native
Flowers: June-September
Growth Duration: Annual
Fowler's knotweed (Polygonum fowleri)
Distribution: Occurring west of the Cascades crest in Washington; Alaska to California, east across Canada to northeastern North America.
Habitat: Coastal salt marshes.
Origin: Native
Flowers: July-November
Growth Duration: Annual
Garden knotweed (Persicaria wallichii)
Distribution: Occurring west of the Cascades crest in Washington; British Columbia to California; also in eastern North America.
Habitat: Waste areas, roadsides, and other disturbed areas where often where somewhat moist.
Origin: Introduced from eastern Asia
Flowers: July-October
Growth Duration: Perennial
Giant knotweed (Fallopia sachalinensis)
Distribution: Occurring chiefly west of the Cascades crest and east in the Columbia River Gorge in Washington; Alaska to California, east to Idaho and Montana, also in eastern North America.
Habitat: Riparian zones, roadsides, meadows, ditches, and other disturbed areas generally at low elevations.
Origin: Introduced from eastern Asia
Flowers: July-September
Growth Duration: Perennial
Himalayan knotweed (Persicaria wallichii)
Distribution: Occurring west of the Cascades crest in Washington; British Columbia to California; also in eastern North America.
Habitat: Waste areas, roadsides, and other disturbed areas where often where somewhat moist.
Origin: Introduced from eastern Asia
Flowers: July-October
Growth Duration: Perennial
Hybrid knotweed (Fallopia ×bohemica)
Distribution: Occurring chiefly west of the Cascades crest in Washington; Alaska to Oregon, east to Montana, and in scattered locations across North America.
Habitat: Riparian zones, roadsides, ditches, wastelots, and other disturbed open areas generally at low elevations.
Origin: Introduced from eastern Asia
Flowers: July-October
Growth Duration: Perennial
Japanese knotweed (Fallopia japonica)
Distribution: Occurring chiefly west of the Cascades crest in Washington; Alaska to California, east across North America to the Atlantic Coast.
Habitat: Riparian zones, roadsides, ditches, wastelots, and other disturbed open areas.
Origin: Introduced from eastern Asia
Flowers: June-September
Growth Duration: Perennial
Leafy dwarf knotweed (Polygonum minimum)
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east to the Rocky Mountains.
Habitat: Open or semi-barren soil in the alpine and subalpine.
Origin: Native
Flowers: July-September
Growth Duration: Annual
Nuttall's knotweed (Polygonum nuttallii)
Distribution: Occurring chiefly west of the Cascades crest in Washington; British Columbia to Oregon, east to Idaho.
Habitat: Prairies, grassy balds, and forest openings at low to moderate elevations.
Origin: Native
Flowers: May-July
Growth Duration: Annual
Palouse knotweed (Polygonum majus)
Distribution: Occurring chiefly east of the Cascades crest in Washington; British Columbia to California, east to the Rocky Mountains.
Habitat: Dry, often semi-barren, gravelly to heavy soil, sagebrush desert to lower mountains.
Origin: Native
Flowers: May-August
Growth Duration: Annual
Parry's knotweed (Polygonum parryi)
Distribution: Occurring in the east end of the Columbia River Gorge in Washington; south-central Washington to California.
Habitat: Vernal pools, seasonally damp ground at low elevations.
Origin: Native
Flowers: June-July
Growth Duration: Annual
Prickly knotweed (Polygonum parryi)
Distribution: Occurring in the east end of the Columbia River Gorge in Washington; south-central Washington to California.
Habitat: Vernal pools, seasonally damp ground at low elevations.
Origin: Native
Flowers: June-July
Growth Duration: Annual
Sawatch knotweed (Polygonum sawatchense)
Distribution: Occurring east of the Cascades crest in Washington; British Columbia to California, east to the Great Plains.
Habitat: Dry to moist forest openings and meadows from moderate elevations to the subalpine.
Origin: Native
Flowers: June-August
Growth Duration: Annual
Spurry knotweed (Polygonum spergulariiforme)
Distribution: Occurring west of the Cascades crest and east in the Columbia River Gorge in Washington; British Columbia to California, east to Idaho, Montana, and Wyoming.
Habitat: Balds, prairies, and headlands in gravelly, sandy or heavy, dry or moist soil at low elevations.
Origin: Native
Flowers: June-September
Growth Duration: Annual
White-margined knotweed (Polygonum polygaloides)
Distribution: Occurring east of the Cascades crest in Washington; British Columbia to California, east to the Rocky Mountains.
Habitat: Meadows, vernal pools and rocky ridges, lowlands to mid-elevations in the mountains.
Origin: Native
Flowers: June-August
Growth Duration: Annual
Wiry knotweed (Polygonum majus)
Distribution: Occurring chiefly east of the Cascades crest in Washington; British Columbia to California, east to the Rocky Mountains.
Habitat: Dry, often semi-barren, gravelly to heavy soil, sagebrush desert to lower mountains.
Origin: Native
Flowers: May-August
Growth Duration: Annual
Zigzag knotweed (Polygonum minimum)
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east to the Rocky Mountains.
Habitat: Open or semi-barren soil in the alpine and subalpine.
Origin: Native
Flowers: July-September
Growth Duration: Annual
Bellard's kobresia (Kobresia myosuroides)
Distribution: Occurring east of the Cascades crest in northern Washington; Alaska to California, east to the Rocky Mountains, east across Canada to the Atlantic Coast; circumboreal.
Habitat: Talus, dry or somewhat moist fellfields, subalpine to alpine.
Origin: Native
Flowers: June-August
Growth Duration: Perennial
Kruhsea (Streptopus streptopoides)
Distribution: Occurring west of the Cascades crest in Washington; Alaska to Oregon, east to Alberta and Idaho.
Habitat: Dense, damp conifer forest, from middle elevations to the subalpine.
Origin: Native
Flowers: May-July
Growth Duration: Perennial
Kudzu (Pueraria montana)
Distribution: Not currently known to occur in Washington; also reported for Oregon, otherwise widespread in eastern North America, especially southeastern U.S.
Habitat: Disturbed, open areas and forest edge.
Origin: Introduced
Flowers: May-June