Cirsium ciliolatum

{{Short description|Species of thistle}}

{{speciesbox

| image =

| genus = Cirsium

| species = ciliolatum

| authority = (L.F.Hend.) J.T.Howell

| synonyms_ref = [http://www.theplantlist.org/tpl1.1/record/gcc-76249 The Plant List, Cirsium ciliolatum (L.F. Hend.) J.T. Howell ]

| synonyms =

• Carduus ciliolatus (L.F.Hend.) A.Heller
• Cirsium breweri subsp. howellii (Petr.) Petr.
• Cirsium howellii Petr.
• Cirsium undulatum var. ciliolatum L.F.Hend.

| status = G3

| status_system = TNC

| status_ref = {{Cite web|date=2022 |url= https://explorer.natureserve.org/Taxon/ELEMENT_GLOBAL.2.157400 |access-date=19 May 2022 |website=NatureServe Explorer |publisher=NatureServe|title= NatureServe Explorer }}

}}

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.[http://bonap.net/MapGallery/County/Cirsium%20ciliolatum.png Biota of North America Program 2014 county distribution map][http://www.calflora.org/cgi-bin/species_query.cgi?where-calrecnum=2121 Calflora taxon report, University of California, Cirsium ciliolatum (L. Henderson) J. Howell, Ashland thistle ] It is related to Cirsium undulatum and may be more accurately described as a variety of that species.[http://www.efloras.org/florataxon.aspx?flora_id=1&taxon_id=250066361 Flora of North America, Cirsium ciliolatum]

Cirsium ciliolatum is a perennial herb growing from a rootstock branching with runner roots to a maximum height near {{convert|200|cm|in|abbr=on}}. 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.