California Thistle (NatureShutterbug) Tags: plantae cirsium asteraceae magnoliophyta magnoliopsida asterales taxonomy:class=magnoliopsida taxonomy:order=asterales taxonomy:family=asteraceae taxonomy:kingdom=plantae taxonomy:genus=cirsium californiathistle taxonomy:phylum=magnoliophyta cirsiumoccidentalecalifornicum taxonomy:species=occidentale taxonomy:binomial=cirsiumoccidentale taxonomy:trinomial=cirsiumoccidentalecalifornicum taxonomy:common=californiathistle