| Family | Scientific Name | Common Name | Habitat | Distribution | Image |
|---|---|---|---|---|---|
| Anacardiaceae | Toxicodendron pubescens | Poison Oak, Southeastern Poison Oak | Longleaf pine sandhills, dry upland woodlands, around dry rock outcrops in the Piedmont and Mountains, barrens. | Primarily Southeastern: s. New Jersey south to n. Florida, west to e. Texas, inland to West Virginia, e. Tennessee, c. Tennessee, se. Missouri, and s. Kansas. |  (c) Bradley, Keith |
| Anacardiaceae | Toxicodendron radicans var. negundo | Midwestern Poison Ivy, Herbe à la puce (frc) | In a wide range of habitats, including mesic forests, rock outcrops, open areas, and disturbed ground. | New York west to Michigan, Minnesota, and Nebraska, south to sw. Virginia, Kentucky, Arkansas, and Texas, almost entirely in or west of the Appalachians. |  (c) Campos, Aidan |
| Anacardiaceae | Toxicodendron radicans var. pubens | Xeric limestone woodlands, barrens, outcrops, and clearings. | S. Illinois and Missouri south to se. Louisiana and s. Texas; disjunct eastward in c. Kentucky, c. Tennessee, and w. Virginia (Virginia Botanical Associates 2019). |  (c) Michael, John - CC-BY | |
| Anacardiaceae | Toxicodendron radicans var. radicans | Eastern Poison Ivy, Herbe à la puce (frc) | In a wide range of habitats, including mesic forests, rock outcrops, swamp forests, brackish marshes, open areas, disturbed ground, usually in more mesic to hydric sites than T. pubescens, and particularly common in areas with fertile soils, such as bottomlands or over calcareous rocks or calcareous sands (as in maritime forests). | Nova Scotia south to s. Florida (and the Bahamas), west to e. Texas, inland to Vermont, c. Pennsylvania, West Virginia, Kentucky, and Arkansas. |  © Scott Ward |
| Anacardiaceae | Toxicodendron radicans var. verrucosum | Texas Poison Ivy | On limestone, in uplands. | Oklahoma south to c. Texas. |  (c) Hale, Vince - CC0 |
| Anacardiaceae | Toxicodendron rydbergii | Western Poison Ivy | Acid pine-oak forests and woodlands at moderate elevations. | Nova Scotia west to British Columbia, south to New England, New York, n. Ohio, n. Illinois, Iowa, w. Kansas, w. Texas, Arizona, Mexico (Chihuahua, Sonora), and Oregon; disjunct in the Appalachians in Pennsylvania, West Virginia, and Virginia. Reported for North Carolina by Gillis (1971), but the location (Cumberland Co., in the fall-line Sandhills), does not seem plausible {investigate further with specimen}. |  (c) Danielson, Erik |
| Anacardiaceae | Toxicodendron vernix | Poison Sumac, Thunderwood, Poison Elder, Poison Dogwood | In fens and other peaty habitats, in the Coastal Plain frequent in streamhead pocosins, sandhill seepage bogs, and bayhead-cutthroat savanna ecotones (c. FL), occurring in the mountains in bogs and further northward in (typically) higher-quality marshes, fens, and swamps. | Nova Scotia west to Minnesota, south to c. peninsular Florida (to Highlands County) and Texas. Found near Paris, Tennessee just west of the transition zone from the Western Highland Rim into the Tennessee Coastal Plain (M. Pyne, pers. comm.; 2025). |  (c) Sorrie, Bruce A. - CC-BY |