Plate of taxon: Cynara cardunculus subsp. flavescens, Carduus acanthoides subsp. acanthoides, Cirsium discolor, Plate of taxon: Cirsium douglasii var. breweri, Cirsium horridulum var. megacanthum, Cirsium remotifolium var. odontolepis, Plate of taxon: Cirsium occidentale var. coulteri, Cirsium occidentale var. californicum, Cirsium occidentale var. candidissimum, Plate of taxon: Cirsium arizonicum var. tenuisectum, Cirsium eatonii var. murdockii, Cirsium scariosum var. scariosum, Plate of taxon: Cirsium scariosum var. americanum, Cirsium vinaceum, Silybum marianum, Saussurea americana