Poison oak

Poison oak is infamous as a groups of plants that cause skin rash upon contact. The genus name, Toxicodendron, comes from the Latin word toxicum, which literally means "poison", and the Greek word dendron, meaning "tree"; hence the name is "poison tree". . They cause an infection of the skin with an oil called urushiol that is stored in their sap. The more the oil gets concentrated in one spot, the more that it will grow, like a bubble.

Species

 * T. diversilobum (Pacific poison oak)
 * T. pubescens (Atlantic poison oak)
 * T. radicans (Eastern poison ivy)
 * T. r. divaricatum (eastern poison ivy)
 * T. r. eximium (eastern poison ivy)
 * T. r. negundo (eastern poison ivy)
 * T. r. pubens (eastern poison ivy)
 * T. r. radicans (eastern poison ivy)
 * T. r. verrucosum (eastern poison ivy)
 * T. rydbergii (Western poison ivy)
 * T. succedaneum (Wax tree)
 * T. vernicifluum (Chinese lacquer)
 * T. vernix (Poison sumac)