Cirsium cymosum is a North American species of thistle known by the common name peregrine thistle. It is native to the western United States, where it has been found in California, Oregon, Nevada, Utah, Idaho, Wyoming, and Montana.Biota of North America Program 2014 county distribution mapCalflora taxon report, University of California, Cirsium cymosum (E. Greene) J. Howell, peregrine thistle
Cirsium cymosum is a biennial or perennial herb with a maximum height just . It is coated in soft and coarse hairs and sometimes cobwebby fibers. The spiny leaves may reach in length, especially toward the base of the stem. They are deeply cut into lobes which are lined with sharp teeth. The inflorescence is a cluster of flower heads each up to 3 centimeters long and 5 wide. The head is lined with sticky, spiny phyllaries and filled with dull white flowers. The fruit is an achene with a dark-colored body just under a centimeter long and a pappus of hairs up to in length.Flora of North America, Cirsium cymosum (Greene) J. T. Howell
Varieties Cirsium cymosum var. canovirens (Rydb.) D.J.Keil - most of species rangeFlora of North America: var. canovirens Cirsium cymosum var. cymosum - California, Nevada, Oregon
References
External links Jepson Manual Treatment Calphotos Photo gallery, University of California