Northstar beach, Upper Newport Bay, Newport Beach, CA 9-11-11. © Joan Avise

Russian Thistle (Tumbleweed, Prickly Russian Thistle)

Salsola tragus

Exotic species from Eurasia

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Crystal Cove State Park, Laguna Beach, CA 8/6/12. © Peter J. Bryant

Crystal Cove State Park, Laguna Beach, CA 8/6/12. © Peter J. Bryant

Crystal Cove State Park, Laguna Beach, CA 8/6/12. © Peter J. Bryant

UCI Ecological Preserve, Irvine, CA 7-25-08. © Joan Avise

Crystal Cove State Park, Laguna Beach, CA 9-11-11. © Joan Avise

UCI Ecological Preserve, Irvine, CA 7-25-08. © Joan Avise

N. Chrstianitos Rd, San Clemente, 10-27-11. © Ron Vanderhoff.

N. Chrstianitos Rd, San Clemente, 10-27-11. © Ron Vanderhoff.