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
Ovated to elliptical leaflets with an acuminate (pointed) tip, the terminal leaflet has a longer stalk while lateral leaflets are nearly sessile
Margin
Variable, ranging from entire (smooth) to coarsely toothed or irregularly lobed, often with a few large teeth
Arrangement
Alternate arrangement on the woody vine or stem
Venation
Pinnate venation with a prominent central midrib and lateral veins branching outward
Key Features
The classic rule 'leaves of three, let them be' combined with alternate compound leaves, variable margins, and hairy aerial roots on older vines
Description
Toxicodendron radicans grows as a woody vine climbing via aerial rootlets, a trailing ground cover, or sometimes as a self-supporting shrub. It produces inconspicuous greenish-white flowers followed by clustered, whitish-gray berries that persist through winter and are a vital food source for birds
Habitat
Found in a wide variety of habitats including woodlands, forest edges, thickets, fields, roadsides, and disturbed areas; thrives in partial shade to full sun and tolerates various soil types
Native Range
Native to North America, widely distributed throughout most of the eastern and central United States and parts of Canada, as well as parts of Central America and Asia