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Yellow Star Thistle *
Centaurea solstitialis Family: Asteraceae (SUNFLOWER). Other common names: Barnaby's thistle. Generic common name: KNAPWEED, STAR-THISTLE. Westlake Blvd. disturbed road margin: chaparral, Sept 2004. Characteristics: Non-Native, Yellow, Medium, Solitary, Simple, Herbaceous, Annual, Late Spring, Summer. Note: Invasive exotic. |
| Detailed description from UCLA website (in PDF format) |