Flora of North America, Western thistle, Cirsium occidentale (Nuttall) Jepson Jepson Flora Project (ed. (wikipedia.org)
Asteraceae1
Cirsium occidentale, with the common name cobweb thistle or cobwebby thistle, is a North American species of thistle in the family Asteraceae. (wikipedia.org)
a short, clumpy California endemic that grows only along the coast of the San Francisco Bay Area and the Central Coast of California Cirsium occidentale var. (wikipedia.org)
a California endemic from the Santa Lucia Range Cirsium occidentale var. (wikipedia.org)
California thistle C. occidentale var. (wikipedia.org)
Calflora taxon report, University of California, Cirsium occidentale (Nutt. (wikipedia.org)
Wavyleaf thistle is listed by California as a noxious weed. (swbiodiversity.org)
However, most reports of Cirsium undulatum in California are based upon misidentifications of C. canescens . (swbiodiversity.org)