Aliso and Wood Cyns. Wilderness Park, Laguna Niguel, CA 4-18-09. © Joan Avise |
Western Poison Oak Toxicodendron diversilobum Distribution in Southern California Back to Anacardiaceae of Orange County, California |
Santiago Oaks Regional Park, Orange, CA 7-3-11. © Joan Avise |
Laguna Coast Wilderness Park, Laguna Beach, CA 6-13-09. © Joan Avise |
Gypsum Cyn., 3-27-11. © Ron Vanderhoff. |
Unnamed Cyn, .75 mi W Sitton Peak, 11-3-11. © Ron Vanderhoff. |
Peter's Cyn Wilderness Park, Irvine, CA 3-09-08. © Joan Avise |
Santa Rosa Plateau Ecol. Reserve, Murrieta, Riverside Co., CA 3-01-09. © Joan Avise |
Santa Rosa Plateau Ecol. Reserve, Murrieta, Riverside Co., CA 3-01-09. © Joan Avise |
Compound leaves of Rhus aromatica (left) are 3-lobed, resembling Poison Oak, Toxicodendron diversilobum (right), but the middle leaflet lacks a distinct petiole (stalk) which poison oak always has. Leaves are not glossy like poison oak, and stems are downy compared to poison oak's which are hairless. Crushed leaves have a pungent odor while poison oak is odorless. Upper Trabuco Cyn., Trabuco Trail, 7-4-12. © Ron Vanderhoff. |
Galls on leaf. San Mateo Creek, San Clemente, 10-13-11. © Ron Vanderhoff. |
Virus on leaf. Old Trabuco Trail, 7-24-11. © Ron Vanderhoff. |
Blackstar Cyn, 10-31-10. © Ron Vanderhoff. |
Top of World Sch to Dripping Cave, 2-27-11. © Ron Vanderhoff. |