Cirsium ciliolatum

Cirsium ciliolatum
Scientific classification
Kingdom: Plantae
(unranked): Angiosperms
(unranked): Eudicots
(unranked): Asterids
Order: Asterales
Family: Asteraceae
Tribe: Cynareae
Genus: Cirsium
Species: C. ciliolatum
Binomial name
Cirsium ciliolatum
(L.F.Hend.) J.T.Howell
Synonyms[1]
  • Carduus ciliolatus (L.F.Hend.) A.Heller
  • Cirsium breweri subsp. howellii (Petr.) Petr.
  • Cirsium howellii Petr.
  • Cirsium undulatum var. ciliolatum L.F.Hend.

Cirsium ciliolatum is a species of thistle known by the common name Ashland thistle. It is endemic to the Klamath Mountains, where it is known from only a few occurrences in Jackson and Josephine Counties in Oregon, as well as neighboring Humboldt and Siskiyou Counties in California.[2][3] It is related to Cirsium undulatum and may be more accurately described as a variety of that species.[4]

Cirsium ciliolatum is a perennial herb growing from a rootstock branching with runner roots to a maximum height near 200 cm (79 in). It is cobwebby with fibers. The gray-green woolly leaves are smooth along the edges to deeply lobed, sometimes spiny and cobwebby, and up to 25 centimeters at the longest. The inflorescence is a cluster of several flower heads each about 2 centimeters long and up to 5 wide. The head is lined with sticky, spiny phyllaries and packed with white to lavender flowers. The fruit is an achene with a thick body a few millimeters long and a pappus about 1.5 centimeters in length.[4]

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