Toxicodendron vernix

Toxicodendron vernix subsp. var.	Poison Sumac, Poison Elder
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	Anacardiaceae > Toxicodendron vernix var. ,

Poison sumac (Toxicodendron vernix or Rhus vernix) is a woody shrub or small tree growing to 7 m (20 ft) tall. 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.

Standard Cyclopedia of Horticulture

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. The above text is from the Standard Cyclopedia of Horticulture. It may be out of date, but still contains valuable and interesting information which can be incorporated into the remainder of the article. Click on "Collapse" in the header to hide this text.

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References

• Standard Cyclopedia of Horticulture, by L. H. Bailey, MacMillan Co., 1963

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