Cirsium hookerianum |
Cirsium andrewsii |
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Hooker's thistle, white thistle |
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Habit | Taprooted, short-lived perennial, the stem densely but loosely covered with long, soft hairs, 4-15 dm. tall, tapering above. | |
Leaves | Leaves with some loose, soft hairs above, thinly white-woolly below, narrowly lanceolate, toothed and moderately spiny. |
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Flowers | Heads clustered toward the top of the simple stem in a compact or elongated inflorescence; involucre 2-3 cm. high, strongly spider-webby, not much imbricate, the bracts all narrow and tapering, the middle and outer with a short, straight spine, the inner often twisted; flowers all tubular, creamy-white; receptacle densely bristly. |
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Cirsium hookerianum |
Cirsium andrewsii |
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Flowering time | July-August | |
Habitat | Moist lowlands, open slopes and fields. | |
Distribution | Occurring east of the Cascades crest in Washington; British Columbia to Washington, east to Alberta, Montana, and Wyoming.
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Origin | Native | |
Conservation status | Not of concern | |
Sibling taxa | ||
Web links |