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 asymmetric lateral leaflets; typically 3 leaflets per leaf
Margin
Entire to coarsely toothed or irregularly lobed
Arrangement
Alternate
Venation
Pinnate with a prominent central midrib and branching lateral veins
Key Features
Compound leaves with three leaflets ('leaves of three'), middle leaflet having a longer stalk than the two side leaflets, alternating leaf arrangement, absence of thorns, and hairy aerial roots when growing as a climbing vine on trees.
Description
It can grow as a ground cover, a climbing vine attached to tree trunks via aerial rootlets, or as a freestanding shrub. The leaves are characteristically divided into three leaflets, inspiring the old adage 'leaves of three, let them be.' In spring, the leaves emerge with a reddish tint, turning glossy green in summer, and culminating in striking fiery autumn colors before dropping.
Habitat
Thrives in a wide variety of habitats including deciduous forests, forest edges, fields, roadsides, and disturbed soils; highly adaptable to both full sun and partial shade.
Native Range
Native to eastern and central North America, extending from Nova Scotia south to Florida, and west to Texas and into parts of Central America.