Rhus Toxicodendron. - Synonyms. - Poison Ivy. Poison Oak. The fresh leaves of Rhus radicans Linne (nat. ord. Anacardieae).


North America, west to Wyoming and Texas; in thickets.


Long-petiolate, trifoliolate; the lateral leaflets sessile or nearly so, about 10 cm. long, obliquely ovate, pointed; the terminal leaflets stalked, ovate or oval, pointed, with a wedge-shaped or rounded base; the leaflets entire and glabrous, or variously notched, coarsely toothed, or lobed, more or less downy; when dry, papery and brittle; inodorous; taste somewhat astringent and acrid. Resembling Rhus Toxicodendron. - The leaves of Ptelea trifoliata, which are similar in appearance, but have all the leaflets sessile.


The chief constituents are - (1) Toxicodendric Acid, a volatile Acid. (2) Tannic Acid. (3) Fixed Oil.

Dose, 1 to 5 gr.; .06 to .30 gm.

Action And Uses Of Rhus Toxicodendron

The tincture of the fresh leaves (dose, 1/10 to 2 m.; .006 to .12 c.c.) has been used in paralysis, nocturnal incontinence of urine and cutaneous diseases; but the remedy is dangerous and probably, an useless one, for these purposes. Largely diluted it has been used as a lotion for bruises and burns.