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|width_ref=Flora - A Gardener's Encyclopedia
|width_ref=Flora - A Gardener's Encyclopedia
|poisonous=Very poisonous
|poisonous=Very poisonous
|poison_ref=Wikipedia
|lifespan=perennial
|lifespan=perennial
|exposure=sun
|exposure=sun
|usda_ref=Flora - A Gardener's Encyclopedia
|usda_ref=Flora - A Gardener's Encyclopedia
|max_zone=9
|max_zone=9
|image=Upload.png
|image=Tove 002 lhp.jpg
|image_width=240
|image_width=240
|image_caption=Poison sumac leaves
}}
}}
'''Poison sumac''' (''[[Toxicodendron]]'' ''vernix'' or ''[[Rhus]] vernix'') is a woody [[shrub]] or small tree growing to 7 m (20 ft) tall.<ref name=Keeler>Our Native Trees and How to Identify Them (Keeler)</ref> All parts of the plant contain a resin called [[urushiol]] that causes skin and mucous membrane irritation to humans. When burned, inhalation of the smoke may cause the rash to appear on the lining of the lungs, causing extreme pain and possibly fatal respiratory difficulty.
Poison sumac is a shrub or small tree, up to 20 feet in height, with 7-13 leaflets per leaf. These are oval to oblong, acuminate, cuneate at the base, undulate, glabrous or slightly pubescent beneath, and are usually 2-4 inch long. Its flowers are greenish, in loose axillary panicles 3-8 inches long. The fruits are subglobose, gray, flattened and 0.2 inches across.
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Rhus vernix, Linn. (R. venenata, DC.). Poison Sumac. Poison Elder. Shrub or tree, to 20 ft.: lfts. 7-13, oval to oblong, acuminate, cuneate at base, undulate, glabrous or slightly pubescent beneath usually 2-4 in. long: fls. greenish, in loose axillary panicles 3-8 in. long: fr. subglobose, gray, flattened, 1/5in. across. Swamps, R. I., Ont., and Minn., south to Fla. and La.—Very poisonous: foliage turns to a brilliant scarlet in autumn.
Rhus vernix, Linn. (R. venenata, DC.). Poison Sumac. Poison Elder. Shrub or tree, to 20 ft.: lfts. 7-13, oval to oblong, acuminate, cuneate at base, undulate, glabrous or slightly pubescent beneath usually 2-4 in. long: fls. greenish, in loose axillary panicles 3-8 in. long: fr. subglobose, gray, flattened, 1/5in. across. Swamps, R. I., Ont., and Minn., south to Fla. and La.—Very poisonous: foliage turns to a brilliant scarlet in autumn.