Vascular Plants

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

Browse by common name:
A, B, C, D, E, F, G, H, I, J, K, L, M, N, O, P, Q, R, S, T, U, V, W, X, Y, Z
Common names beginning with K:
Milky Kelloggia (Kelloggia galioides)
Distribution: In the Olympics and east of the Cascades in Washington; Washington south to California, east to Montana, Wyoming and New Mexico
Habitat: Forest openings, mid- to high elevations in the mountains.
Origin: Native
Flowers: June-August
Kenilworth-ivy (Cymbalaria muralis)
Distribution: Introduced west of the Cascades, British Columbia to Oregon
Habitat: Wasteland,disturbed soil
Origin: Introduced from Eurasia
Flowers: April - October
Kentrophyta (Astragalus kentrophyta)
Origin: Native
Flowers: July - September
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
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
Kinnikinnick (Arctostaphylos nevadensis)
Distribution: Occurring on both sides of the Cascades crest in Washington; Washington south to California, east to Nevada.
Habitat: Chiefly in the mountains at mid-elevations.
Origin: Native
Flowers: May-July
Kinnikinnik (Arctostaphylos uva-ursi)
Distribution: Widely distributed throughout Washington; Alaska south to California and New Mexico, east to the Atlantic Coast; circumboreal.
Habitat: Coastal bluffs and prairies, rocky balds, dry subalpine meadows, and dry coniferous forest.
Origin: Native
Flowers: April-June
Kiss-me-over-the-garden-gate (Persicaria orientalis)
Origin: Introduced
Fringe-petal kitten's-tail (Synthyris schizantha)
Distribution: In the Olympics and Cascades foothills of western Washington; Washington south to northwest Oregon.
Habitat: Uncommon on moist ground at mid-elevations in the mountains.
Origin: Native
Flowers: May-August
Cut-leaf kittentails (Synthyris lanuginosa)
Distribution: Endemic to the Olympic Mountains of Washington.
Habitat: Subalpine and alpine rocky slopes.
Origin: Native
Flowers: June-August
Mountain kittentails (Synthyris missurica)
Distribution: Columbia River Gorge, southeast Washington and northeast Oregon, east to Idaho and Montana and south to California
Habitat: Moist ground, foothills to mid-elevations in the mountains
Origin: Native
Flowers: April - July
Round-leaved kittentails (Synthyris reniformis)
Distribution: Occurring west of the Cascades crest in Washington; Washington south to California.
Habitat: Coniferous woods, less commonly in open areas, at low elevations.
Origin: Native
Flowers: March-May
Black knapweed (Centaurea nigra)
Distribution: Introduced in the Pacific Northwest and northeastern United States
Habitat: Uncommon weed in disturbed soil
Origin: Introduced from Europe
Flowers: July - October
Brown knapweed (Centaurea jacea)
Origin: Introduced from Europe
Flowers: July - October
Brownray knapweed (Centaurea jacea)
Origin: Introduced from Europe
Flowers: July - October
Diffuse knapweed (Centaurea diffusa)
Distribution: Introduced throughout the Pacific Northwest; widespread and common in eastern Washington
Habitat: Noxious weed of dry, disturbed areas
Origin: Introduced from the eastern Mediterranean region
Flowers: July - September
Featherhead knapweed (Centaurea trichocephala)
Origin: Introduced
Globe knapweed (Centaurea macrocephala)
Distribution: Sparingly introduced in Washington
Habitat: Occasionally escapes from cultivation
Origin: Introduced
Flowers: June - September
Hybrid diffuse knapweed (Centaurea ×varnensis)
Origin: Introduced
Hybrid knapweed (Centaurea ×gerstlaueri)
Distribution: Occurring on both sides of the Cascades in Washington; British Columbia to California, east to Idaho and Montana; also in eastern North America.
Habitat: Open ground, often where disturbed.
Origin: Introduced
Flowers: June-August
Iberian knapweed (Centaurea iberica)
Origin: Introduced
Lesser knapweed (Centaurea nigra)
Distribution: Introduced in the Pacific Northwest and northeastern United States
Habitat: Uncommon weed in disturbed soil
Origin: Introduced from Europe
Flowers: July - October
Meadow knapweed (Centaurea ×gerstlaueri)
Distribution: Occurring on both sides of the Cascades in Washington; British Columbia to California, east to Idaho and Montana; also in eastern North America.
Habitat: Open ground, often where disturbed.
Origin: Introduced
Flowers: June-August
Protean knapweed (Centaurea ×gerstlaueri)
Distribution: Occurring on both sides of the Cascades in Washington; British Columbia to California, east to Idaho and Montana; also in eastern North America.
Habitat: Open ground, often where disturbed.
Origin: Introduced
Flowers: June-August
Russian knapweed (Rhaponticum repens)
Distribution: Introduced chiefly east of the Cascades in Washington; widely distributed throughout much of North America.
Habitat: Dry, open areas at low elevation and foothills.
Origin: Introduced
Flowers: June-September
Sand knapweed (Centaurea ×varnensis)
Origin: Introduced
Short fringed knapweed (Centaurea nigrescens)
Distribution: Introduced and widely distributed in northeast United States and southeast Canada; occasional in the Pacific Northwest.
Habitat: Fields, roadsides and waste places.
Origin: Introduced from Europe
Flowers: July - October
Spotted knapweed (Centaurea stoebe)
Distribution: Widely established throughout Washington; occurring throughout much of North America.
Habitat: Fields, roadasides, and waste areas.
Origin: Introduced
Flowers: June-October
Tumble knapweed (Centaurea diffusa)
Distribution: Introduced throughout the Pacific Northwest; widespread and common in eastern Washington
Habitat: Noxious weed of dry, disturbed areas
Origin: Introduced from the eastern Mediterranean region
Flowers: July - September
Tyrol knapweed (Centaurea nigrescens)
Distribution: Introduced and widely distributed in northeast United States and southeast Canada; occasional in the Pacific Northwest.
Habitat: Fields, roadsides and waste places.
Origin: Introduced from Europe
Flowers: July - October
White knapweed (Centaurea diffusa)
Distribution: Introduced throughout the Pacific Northwest; widespread and common in eastern Washington
Habitat: Noxious weed of dry, disturbed areas
Origin: Introduced from the eastern Mediterranean region
Flowers: July - September
Annual knawel (Scleranthus annuus)
Distribution: Occasional introductions throughout the Pacific Northwest
Habitat: Disturbed soils, waste lots, cultivated areas.
Origin: Introduced from Europe
Flowers: April-July
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
Knotgrass (Paspalum distichum)
Distribution: Occurring chiefly along the lower Columbia River corridor in Washington; occurring in most of western North America and the southeastern U.S.
Habitat: Along ditches and streams where the soil is moist much of the season.
Origin: Native
Flowers: August-October
Austin's knotweed (Polygonum austiniae)
Distribution: Central Oregon to northeast California, east to Idaho and southcentral Montana.
Habitat: Dry to moist banks and flats, from sagebrush plains to lower mountains, often with ponderosa pine.
Origin: Native
Flowers: June - August
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
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
Blake's knotweed (Polygonum achoreum)
Origin: Native
Bohemian knotweed (Fallopia ×bohemica)
Origin: Introduced from eastern Asia
California knotweed (Polygonum californicum)
Origin: Native
Flowers: July - September
Davis' knotweed (Aconogonon davisiae)
Distribution: Cascades and Olympic mountains of Wahington, south to California, east to Idaho and western Montana.
Habitat: Slopes and ridges in the subalpine and alpine.
Origin: Native
Flowers: June-September
Davis's knotweed (Aconogonon davisiae)
Distribution: Cascades and Olympic mountains of Wahington, south to California, east to Idaho and western Montana.
Habitat: Slopes and ridges in the subalpine and alpine.
Origin: Native
Flowers: June-September
Dotted knotweed (Persicaria punctata)
Distribution: Occurring mostly in south-central Washington; British Columbia south to California, east to the Atlantic Coast.
Habitat: Lake and pond shores, marshes, and wet forests.
Origin: Native
Flowers: June-September
Douglas' knotweed (Polygonum douglasii)
Distribution: Widely distributed throughout most of Washington; British Columbia south to California, east to the Rocky Mountains and across northern U.S./southern Canada to the Atlantic Coast.
Habitat: Common in dry to moist areas, lowlands to mid-elevations in the mountains.
Origin: Native
Flowers: June-September
Douglas's knotweed (Polygonum douglasii)
Distribution: Widely distributed throughout most of Washington; British Columbia south to California, east to the Rocky Mountains and across northern U.S./southern Canada to the Atlantic Coast.
Habitat: Common in dry to moist areas, lowlands to mid-elevations in the mountains.
Origin: Native
Flowers: June-September
Erect knotweed (Polygonum erectum)
Origin: Native
Flowers: June - September
Fall knotweed (Polygonum spergulariiforme)
Distribution: British Columbia to California, chiefly west of the Cascades in Washington, east to southeast Washington, Idaho and Colorado.
Habitat: Gravelly, sandy or heavy dry or moist soil at low elevations.
Origin: Native
Flowers: June - September
Fowler's knotweed (Polygonum fowleri)
Distribution: Occurring west of the Cascades in Washington; Alaska south to California, east across northern Canada to northeastern North America.
Habitat: Coastal salt marshes.
Origin: Native
Flowers: July-November
Garden knotweed (Persicaria wallichii)
Distribution: Occurring west of the Cascades crest in Washington; British Columbia south 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
Giant knotweed (Fallopia sachalinensis)
Origin: Introduced from eastern Asia
Himalayan knotweed (Persicaria wallichii)
Distribution: Occurring west of the Cascades crest in Washington; British Columbia south 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
Hybrid Japanese knotweed (Fallopia ×bohemica)
Origin: Introduced from eastern Asia
Japanese knotweed (Fallopia japonica)
Origin: Introduced from eastern Asia
Leafy dwarf knotweed (Polygonum minimum)
Distribution: British Columbia south in the Cascades and higher coastal mountains to the southern Sierra Navada, east in the Rockies from Montana to Colorado.
Habitat: Open or semi-barren soil in the alpine and subalpine.
Origin: Native
Flowers: July - September
Nepal knotweed (Persicaria nepalensis)
Origin: Introduced
Nuttall's knotweed (Polygonum nuttallii)
Distribution: Occurring chiefly west of the Cascades crest in Washington; British Columbia south to Oregon
Habitat: Prairies, grassy balds, and forest openings at low to moderate elevations.
Origin: Native
Flowers: May-July
Palouse knotweed (Polygonum majus)
Distribution: Occurring east of the Cascades crest in Washington; British Columbia south 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
Parry's knotweed (Polygonum parryi)
Origin: Native
Flowers: June - July
Spurry knotweed (Polygonum spergulariiforme)
Distribution: British Columbia to California, chiefly west of the Cascades in Washington, east to southeast Washington, Idaho and Colorado.
Habitat: Gravelly, sandy or heavy dry or moist soil at low elevations.
Origin: Native
Flowers: June - September
Wiry knotweed (Polygonum majus)
Distribution: Occurring east of the Cascades crest in Washington; British Columbia south 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
Zigzag knotweed (Polygonum minimum)
Distribution: British Columbia south in the Cascades and higher coastal mountains to the southern Sierra Navada, east in the Rockies from Montana to Colorado.
Habitat: Open or semi-barren soil in the alpine and subalpine.
Origin: Native
Flowers: July - September
Bellard's kobresia (Kobresia myosuroides)
Origin: Native
Flowers: June - August
Kruhsea (Streptopus streptopoides)
Origin: Native
Kudzu (Pueraria montana)
Origin: Introduced