Taxonomy
- Taxonomic Rank
- Variety
- Author
- Hoover
- Publication
- Vasc. Pl. San Luis Obispo Co., Calif. : 310 (1970)
Superior Taxa
- Kingdom
- Plantae
- Subkingdom
- Pteridobiotina
- Phylum
- Angiosperms
- Order
- Asterales
- Family
- Asteraceae
- Subfamily
- Carduoideae
- Tribe
- Cardueae
- Subtribe
- Carduinae
- Genus
- Cirsium
- Species
- Cirsium occidentale