poison oak

Toxicodendron diversilobum

Toxicodendron diversilobum, a dicot, is a vine or shrub that is native to California and is also found outside of California, but is confined to western North America. It’s bloom period is March-June. This plant has known uses according to Wikipedia.

Distribution   Description   Toxin qualities   Reactions   Ecology   Uses   Medicinal   Cultivation

additional informational links: Wikipedia , Calflora 

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