Cirsium remotifolium var. odontolepis
Variety odontolepis occurs from the Coast Ranges and valleys of Oregon and the western Cascade Range south through the Siskiyou Area and the California North Coast Ranges to the San Francisco Bay region. California populations of var. odontolepis usually have cream-colored corollas. Some Oregon populations have cream-colored corollas, and others, particularly in the Cascade Range, have purple corollas. The latter have been called subsp. oregonense. In other features these plants are very similar and have overlapping patterns of variation. Further study is needed to determine whether the purple-flowered plants are worthy of taxonomic recognition.