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 asymmetric bases and pointed tips; the terminal leaflet has a longer stalk than the two lateral leaflets
Margin
Entire to coarsely and irregularly toothed or lobed, highly variable
Arrangement
Alternate on the woody vine or stem
Venation
Pinnate venation with a prominent central midrib and a clearly visible, raised reticulate net-like secondary vein network
Key Features
The classic 'leaves of three, let them be' mantra defines its primary diagnostic feature. Other key features include the asymmetric side leaflets, the longer stalk on the terminal leaflet, and the absence of thorns.
Description
Toxicodendron radicans is a notoriously adaptable woody vine or small shrub known for its compound leaves composed of three distinct leaflets. The plant can grow as a ground cover, climb aggressively up tree trunks via aerial rootlets, or stand upright as a free-standing shrub. It produces inconspicuous greenish-white flowers followed by whitish-yellow berries that persist into winter, serving as an important food source for birds.
Habitat
Thrives in a wide variety of habitats including forest edges, wooded slopes, thickets, fields, and disturbed areas; highly adaptable to both full sun and deep shade
Native Range
Native to eastern, central, and southern North America, extending into parts of Central America