Taxonomy: Kingdom - Plantae (plants). Subkingdom - Tracheobionta (vascular plants). Superdivision - Spermatophyta (seed plants). Division - Magnoliophyta(FLowering plants). Class - Magnoliopsida. Order - Sapindales. Family - Anacardiaceae (Sumac family). Genus -Toxicodendron Mill. Species - Toxicodendren radicans (L.) Kuntze.
Ecology: Poison-ivies occur in a variety of plant communities from barrier-island sand dunes to subalpine sites. They occur primarily in wetlands, floodplains, bottomlands, and riparian communities throughout their ranges, but they also occur frequently in upland hardwood, mixed hardwood-conifer, and conifer forests and woodlands. In forests, they often occur in canopy gaps and on edges. They also occur in prairies and other grasslands as well as on rocky fields, talus slopes, and cliffs.