Toxicodendron rydbergii
Scientific classification
Kingdom:	Plantae
(unranked):	Angiosperms
(unranked):	Eudicots
(unranked):	Rosids
Order:	Sapindales
Family:	Anacardiaceae
Genus:	Toxicodendron
Species:	T. rydbergii
Binomial name
Toxicodendron rydbergii (Small ex Rydb.) Greene

Toxicodendron rydbergii (syn. Rhus rydbergii; Western Poison-ivy) is a species of Toxicodendron native to most of the United States except the southeastern states, where it can be found growing in forests, and other wooded areas, usually near streams and rivers.^[1]

It is a shrub that can grow to 1 m (3 ft) tall, rarely up to 3 m (10 ft). The leaves are trifoliate and alternate. The leaflets are variable in size and shape, and are usually 15 cm (6 in) long, turning yellow or orange in autumn. The fruits are small, round, and yellowish.^[1]

[edit] Caution

All parts of this plant contain Urushiol, which can cause severe dermatitis in some individuals.

[edit] References