Poison Ivy (Eastern Poison Ivy)
Toxicodendron radicans · Anacardiaceae (Cashew or Sumac family)
AI-generated identification · may be incorrect
Leaf Morphology
Leaf Type
Compound (trifoliate with three leaflets), deciduous
Shape
Ovate to elliptical with asymmetrical lateral leaflets; terminal leaflet has a longer stalk
Margin
Entire, coarsely toothed, or occasionally lobed
Arrangement
Alternate
Venation
Pinnate with a prominent central midrib and branching lateral veins
Key Features
The classic 'leaves of three, let them be' rule; alternating trifoliate leaves with the middle leaflet having a noticeably longer stalk; asymmetrical lateral leaflets that often resemble mittens; hairy aerial roots on older vines.
Description
Poison ivy is a highly adaptable woody vine or shrub known for its compound leaves composed of three leaflets. It exhibits a trailing, climbing, or shrubby growth habit, attaching itself to trees and structures via dense aerial roots. The plant produces inconspicuous greenish-white flowers followed by whitish-gray, waxy berries that persist into winter.
Habitat
Thrives in a wide variety of habitats including forests, woodland edges, thickets, fields, and disturbed roadsides; highly adaptable to both sun and shade
Native Range
Native to eastern and central North America, extending from southern Canada down to Florida and west to Texas and the Rocky Mountains