Toxicodendron rydbergii

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Toxicodendron rydbergii
Scientific classification
Kingdom: Plantae
Division: Magnoliophyta
Class: Magnoliopsida
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 Pacific 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]


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


  1. 1.0 1.1 USDA Fire Effects Information System: Toxicodendron rydbergii

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