Cirsium hookerianum

Cirsium hookerianum, common name Hooker's thistle or white thistle,[2] is a North American species of thistle native to western Canada and the northwestern United States. It is found in the northern Rocky Mountains as well as in some of the northern Cascades and Coast Ranges, in Alberta, British Columbia, Washington, Idaho, Montana, and Wyoming.[3]

Cirsium hookerianum
Photo of herbarium specimen collected in Montana
Scientific classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Asterids
Order: Asterales
Family: Asteraceae
Genus: Cirsium
Species:
C. hookerianum
Binomial name
Cirsium hookerianum
Synonyms[1]
  • Carduus hookerianus (A.Gray) A.Heller
  • Cnicus hookerianus A.Gray

Cirsium hookerianum is biennial or perennial herb up to 150 cm (60 inches) tall, with a large taproot. Leaves are green on top, usually white and woolly underneath, with spines along the edges. There are usually several flower heads with white or pink disc florets but no ray florets. The species grows in grasslands, meadows, and the edges of forests in mountainous areas.[4][2]

References
  1. The Plant List, Cirsium hookerianum Nutt.
  2. Flora of North America, Hooker’s or white thistle, Cirsium hookerianum Nutt.
  3. Biota of North America Program 2014 county distribution map
  4. Nuttall, Thomas 1841. Transactions of the American Philosophical Society, new series 7: 418–419


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