Male top, female bottom. Green River Golf Course. E edge, 8-28-13. © Ron Vanderhoff.

Rough Cocklebur

Xanthium strumarium

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San Mateo Creek, San Clemente, 10-13-11. © Ron Vanderhoff.

Irvine Lake, 8-30-12. © Ron Vanderhoff.

San Juan Ck Channel, Michelson to Campus, 9-24-11. © Ron Vanderhoff.

Whispering Hills Trail, San Juan Hills, 12-11-11. © Ron Vanderhoff.

Salt Creek mouth, beach to 1 mi NW, 7-19-12. © Ron Vanderhoff.