Peter's Canyon Regional Park, Irvine, CA 4-26-09. © Joan Avise

Milk thistle
(Variegated Thistle)

Silybum marianum

Exotic species, native to Southern Europe to Asia

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Crystal Cove State Park, Laguna Beach, CA 3-21-09. © Joan Avise

Peter's Canyon Regional Park, Irvine, CA 4-26-09. © Joan Avise

Whiting Ranch, 4-3-11. © Ron Vanderhoff.

Bee Cyn and Cyn to SE, E of 241, 5-9-10. © Ron Vanderhoff.

Agua Chinon to Loma Ridge Rd, Limestone Cyn, 3-13-11. © Ron Vanderhoff.

Agua Chinon to Loma Ridge Rd, Limestone Cyn, 3-13-11. © Ron Vanderhoff.