Toxicodendron radicans (poison ivy)

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Notes

Key Characteristics

  • Usually a creeping or climbing vine, but may be an erect shrub; climbing tree trunks, attaching to the bark by tiny aerial rootlets, and branching toward 1 m.
  • Bark gray
  • Leaves alternate, pinnately compound, 2 leaflets, 15-30 cm long; leaflets 5-12 cm long; terminal leaflet longer-stalked than laterals; ovate to rhombic, short-acuminate; entire or sparingly or coarsely dentate or sinuate; usually more or less wrinkled; glabrous, lustrous yellowish green above, more or less pubescent beneath; not aromatic; petioles 5-10 cm long.
  • Twigs slender, yellowish brown, sparingly pubescent or glabrate.
  • Winter buds naked, light brown, scurfy-pubescent; terminal buds erect, fingerlike; lateral buds much smaller, appressed.

Sourced from "Michigan Shrubs"

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Pictures

Many come from Steve Baskauf at Vanderbilt University

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