Page authors: Don Knoke, David Giblin
Cirsium hookerianum
Hooker's thistle, white thistle
WTU specimens
Other herbaria
WTU images

Distribution: Occurring east of the Cascades crest in Washington; British Columbia to Washington, east to Alberta, Montana, and Wyoming.

Habitat: Moist lowlands, open slopes and fields.

Flowers: July-August

Origin: Native

Conservation Status: Not of concern

Description:
General:

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.

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.

Accepted Name:
Cirsium hookerianum Nutt.
Publication: Trans. Amer. Philos. Soc., n. s. 7: 418. 1841.

Synonyms & Misapplications:
(none provided)
Additional Resources:

PNW Herbaria: Specimen records of Cirsium hookerianum in the Consortium of Pacific Northwest Herbaria database.

WA Flora Checklist: Cirsium hookerianum checklist entry.

E-Flora BC: Cirsium hookerianum atlas page.

CalPhotos: Cirsium hookerianum photos.

USDA Plants: Cirsium hookerianum information.

14 photographs:
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