Toxicodendron radicans
Family: Anacardiaceae
common eastern poison-ivy, poison-ivy
Toxicodendron radicans image
Emmet J. Judziewicz  
Etymology: Toxicodendron: means "poison tree"
Plants: climbing, perennial, woody vine; stems with centipede-like aerial roots that grasp the host tree
Leaves: alternate, somewhat shiny, 3-parted, leaflets with large teeth or shallow lobes
Flowers: 5-parted; blooms May-June
Fruits: whitish berry
Habitat: woods, wood edges, floodplains, openings
Hazardous: Careful, this plant is hazardous!
Conservation Status: Native
Floodplain forests with  silver maple, green ash, river birch, swamp white oak, and hackberry; river islands, willow thickets, lakeshores, tree lines and fencerows, rock outcrops and cliffs, fields, roadsides, along railroads, upland forests of oak, oak-hickory, sugar maple-basswood, sugar maple-paper birch-hemlock.

This is a high-climbing vine with aerial roots and widely spreading lateral branches; our only other native vine with aerial roots is Parthenocissus quinquefolia, which has 5 leaflets.  Plants can be shrub-like if nothing is available to climb and usually have tall, erect stems.  Petiole pubescence is usually dense and consists of both incurved and spreading hairs.  The leaflets are usually coarsely-toothed or lobed.  This is a highly variable species, and our plants are subsp. negundo (Greene) Gillis.

This species is more common south of the Tension Zone, especially along major rivers.  Its full range in the state needs investigation.