[Members of the Sunflower Family with Button-like Flower Heads in the Mountains and Deserts of the American Southwest]

Thistles in the Mountains and Deserts of the American Southwest

The Genus Cirsium

Thistles: The Genus Cirsium in the Mountains and Deserts of the American Southwest

California Thistle: Cirsium occidentale var. californicum

California Thistle, Bigelow Thistle, Cobwebby Thistle: Cirsium occidentale var. californicum

Paul Slichter E-mail