©The World Botanical Associates Web Page
Prepared by Richard W. Spjut
Feb 2013, June 2016

Toxicodendron diversilobum
Kern Co., CA
Kern River Canyon
Apr 2011

Piute Mts., Kern Co., south of Lake Isabella along Erskine Creek, 28 May 2016

Kern Co., CA
Kern River Canyon, Old Kern Co. Rd.
29 Apr 2016



Trees and Shrubs of Kern County (Feb 2013)

Toxicodendron diversilobum (Rhus diversiloba Torrey & A. Gray 1838) Greene 1905.  Poison oak. Slender simple-stemmed shrubs with leaves mostly near the tips of stem; leaves alternate, divided into 3 leaflets, the terminal leaflet stalked—on a longer stalk than the lower lateral leaflets, shiny green in the spring and summer, turning red in the Fall, falling off in the Winter (deciduous); leaflets lobed to entire along margins; fruit grape-like in size but with a papery wall in texture, straw colored to whitish or yellowish, often in dangling infructescences. Scrambling about rocks, or vine like on tree trunks, or in the understory of open forest, or along margins of forest or trails, especially rocky ravines.  Widely distributed and common in the western U.S. below 5,000 ft.  Type from borders of woods, CA, OR.  See Waynes Word ( for more info.