Cirsium vulgare |
Cirsium flodmanii |
|
---|---|---|
bull thistle, common thistle |
Flodman's thistle |
|
Habit | Stout biennial, 3-15 dm. tall, the stem conspicuously spiny-winged from the bases of the leaves and covered with stiff, blunt hairs. | |
Leaves | Leaves pinnatifid, the largest again toothed or lobed; leaves covered with short, pointed hairs above and thinly white-woolly below. |
|
Flowers | Heads several; involucre 2.5-4 cm. high, all its bracts spine-tipped; flowers all ligulate, purple or rarely white. |
|
Fruits | Achenes less than 4 mm. long. |
|
Cirsium vulgare |
Cirsium flodmanii |
|
Flowering time | June-September | June-August |
Habitat | Roadsides, fields, forest edge, ditches, balds, prairies, wastelots, and other disturbed, open areas. | Grasslands, stream banks, and roadsides at low to middle elevations. |
Distribution | Widely distributed on both sides of the Cascades crest in Washington; British Columbia to California, east to the Atlantic Coast.
|
British Columbia to north-central Washington,south in the Rocky Mountains from Alberta, east to the Great Plains and Great Lakes region.
|
Origin | Introduced from Eurasia | |
Conservation status | Not of concern | Review Group 1 in Washington (WANHP) |
Sibling taxa | ||
Web links |
|