Western vs. Eastern Poison Ivy

Toxicodendron rydbergii (Western Poison Ivy)	Toxicodendron radicans (Eastern Poison Ivy)
Flowers: Clusters 2-12 inches. Each flower about 1/16inches across. Greenish white petals.	Flowers: Clusters up to 4 inches. Male and female flowers on separate plants. Each flower about 4/16inches across. Greenish white to yellowish green petals.
Leaves and Stems: "The upper leaf surface is hairless and shiny, becoming dull with age... The underside... with a few hairs along the midvein." Cited website also has comment "often drooping" and "often folded along midrib".	Leaves and Stems: "The upper leaf surface is sparsely covered in appressed hairs, the underside... more densely hairy especially along major veins. " "Plants can grow shrub-like with stems up to 1 inch diameter at breast height, or as a climbing vine with a trunk 2 or more inches in diameter and numerous aerial roots that latch onto tree bark for support." "Eastern Poison Ivy has hairy leaf stalks and hairier leaves and its growth habit is either more branching and shrub-like, or vining which Western Poison Ivy never does."
Fruit ~1/8 inch in diameter.	Fruit ~1/6 inch in diameter.

Posted on June 30, 2023 08:12 PM by

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