Senecio
butterweed, groundsel, ragwort
12 species
5 subspecies and varieties
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Senecio elmeriElmer's ragwort
Distribution: Occurring in the Cascade and Wenatchee Mountains of central and northern Washington; British Columbia south to Washington.
Habitat: Talus slopes and other rocky places in alpine areas.
Origin: Native
Flowers: July-September
Senecio fremontiidwarf mountain butterweed
Distribution: British Columbia to California, east to Colorado
Habitat: Open, rocky slopes at high elevations in the mountains
Origin: Native
Flowers: July - September
var. fremontii – dwarf mountain groundsel
Senecio hydrophiloidessweet marsh butterweed, stout meadow groundsel
Distribution: East of the Cascades, Okanogan County and adjacent British Columbia, south to eastern Oregon and east to western Montana.
Habitat: Wet meadows in the mountains and foothills, but not in alkali.
Origin: Native
Flowers: May - July
Senecio hydrophilusalkali marsh butterweed, water groundsel, alkali marsh ragwort
Distribution: East of the Cascades, British Columbia to California, east to South Dakota and Colorado.
Habitat: Swampy places in the valleys and foothills; tolerant of alkali.
Origin: Native
Flowers: June- September
Senecio integerrimusone-stemmed butterweed, western groundsel
Distribution: Widely distributed throughout most of Washington; British Columbia south to California, east to the central regions of Canada and the U.S.
Habitat: Open areas from the valleys to near timberline.
Origin: Native
Flowers: May-July
var. exaltatus – lambstongue groundsel, tall western groundsel
var. ochroleucus – white western groundsel
Senecio lugensblack-tipped groundsel
Distribution: Alaska and Yukon, south to the Olympic Mountains and the northern mountains in Wyoming; reported in Okanogan County, but otherwise not known in the Cascades.
Habitat: Wet meadows, grassy alpine slopes and rich northern woods.
Origin: Native
Flowers: July - August
Senecio neowebsteriOlympic Mountain ragwort
Distribution: Olympic Mountains of Washington at high elevations.
Habitat: Talus slopes and rocky places.
Origin: Native
Flowers: Aug.-Sept.
Senecio serratall butterweed, butterweed groundsel
Distribution: Occurring chiefly east of the Cascades crest in Washington; Washington south to California, east to the Rocky Mountains north of Arizona and New Mexico.
Habitat: Meadows and open, moist hillsides, foothills to mid-elevations in the mountains.
Origin: Native
Flowers: June-August
var. serra – tall butterweed, butterweed groundsel
Senecio sylvaticuswood groundsel, woodland groundsel, woodland ragwort
Distribution: Occurring chiefly west of the Cascades crest in Washington; British Columbia to California, also in eastern North America.
Habitat: Disturbed ground at low elevations.
Origin: Introduced from Europe
Flowers: May-September
Senecio triangularisarrowleaf groundsel, arrowleaf ragwort
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska south to California, east to the Rocky Mountains.
Habitat: Moist places and streambanks, moderate to high elevations in the mountains, and low elvations west of the Cascades.
Origin: Native
Flowers: June-September
Senecio viscosussticky ragwort
Origin: Introduced
Senecio vulgariscommon groundsel, old man in the spring
Distribution: Introduced throughout the United States; common west of the Cascades in the Pacific Northwest
Habitat: Roadsides, waste ground
Origin: Introduced from Europe