Toxicodendron diversilobum (Torr. &

    A. Gray) Greene
Family: Anacardiaceae

Pertinent Synonyms & Notes (particularly those used in California; go to GRIN for other synonyms)

Rhus diversiloba Torr. & A. Gray

Note—all parts of plant (except pollen) contain resin that can cause contact dermatitis.

Pertinent Common Names (particularly those used in California; go to GRIN for other common names)

Pacific poison oak

Primary Disseminule Type


Description (diagnostics are in brown)

Fruit a drupe with one seed, globose to somewhat laterally compressed, creamy white with longitudinal dark striations (i.e., resin ducts) embedded in deep grooves in the mesocarp, 5.5–6 mm long x 4.5 mm wide x ca. 3 mm thick, glabrous to finely bristly. White exocarp thin and easily rubbed off, but mesocarp (i.e., pulp) thick, waxy, hard, whitish turning brown with age.

Embryo bent, endosperm present.

Risk Assessment (codes in yellow or red indicate cause for concern; assessments are current as of mid-2011; click AUQP, NZBORIC, or NZBPI for access to the most recent versions of these databases and possible assessment changes)