Cirsium ciliolatum

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
Scientific classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Asterids
Order: Asterales
Family: Asteraceae
Genus: Cirsium
Species:
C. ciliolatum
Binomial name
Cirsium ciliolatum
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 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]

References
  1. The Plant List, Cirsium ciliolatum (L.F. Hend.) J.T. Howell
  2. Biota of North America Program 2014 county distribution map
  3. Calflora taxon report, University of California, Cirsium ciliolatum (L. Henderson) J. Howell, Ashland thistle
  4. Flora of North America, Cirsium ciliolatum


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