Toxicodendron vernix (L.) Kuntze

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Toxicodendron vernix, commonly known as poison sumac, or swamp-sumach, is a woody shrub or small tree growing to 9 metres (30 feet) tall. It was previously known as Rhus vernix. This plant is also known as thunderwood, particularly where it occurs in the southern United States. All parts of the plant contain a resin called urushiol that causes skin and mucous membrane irritation to humans. When the plant is 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, growing up to nearly 9 metres (30 feet) in height. Each pinnate leaf has 7–13 leaflets, each of which is 5–10 centimetres (2–4 inches) long. These are oval-to-oblong; acuminate (tapering to a sharp point); cuneate (wedge-shaped) at the base; undulate (wavy-edged); with an underside that is glabrous (hairless) or slightly pubescent (down-like hair) beneath. The stems along the leaflets are red and the leaves can have a reddish tint to them, particularly at the top of the plant. New bark for a poison sumac tree is lightish gray, and as the bark ages, it becomes darker.

Its flowers are greenish, growing in loose axillary panicles (clusters) 8–20 cm (3–8 in) long. The fruits are subglobose (not quite spherical), whitish-gray, flattened, and about 0.5 cm (1⁄4 in) across; these are eaten by birds.

Poison sumac fruit are creamy white and part of a cluster. Typically, they are around 4 to 5 millimetres (5⁄32 to 3⁄16 in) in size.

Toxicodendron vernix - Wikipedia

 

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