ORD. XXXVII. DUMOSA:, 
RHUS TOXICODENDRON. PUBESCENT. POISON-OAK, 
, SUMACH. 
SYNONYMA. Hedera trefolia virginiensis. Park. Theatr. 679.5. Arbor 
trifolia venenata virginiana, folio hirsuto. Raii. Hist. 1799. Rhus radi- 
cans. Linn, Sp. Pl. 381. Wild. Sp. Pl. I. p. 1481 ; Kalm. Trav. v. 1. 67. 
177. Ait. Hort. Kew. ed. 2. v. 2. p. 163. Bigel. Med. Bot. Rhus. Toxicoden- 
dron. Sept.205; Linn. Sp. Pl.381. Willd. 1. 1481. Bot. Mag. v. 43. t. 
1806; Mich. Bor. Am.1.p.183. Ait. Hort. Kew. ed. 2. v. 2. p. 164. t. 43. 
Pursh. Fl.Amer. 
Class V. Pentandria. Ord. II. Digynia. 
Nat. Ord. Dumose, Linn. Terebintacee, Juss. 
Gen. Char. Calyx, five parted. Petals, five. Berry, one—seeded. 
Spee. Char. Leaves, ternate. Leaflets, petioled, often angled, pubescent 
Stem, frequently rooting. 
4 te 
THIS species of sumach is a small shrub; seldom exceeding three feet in 
height. The root is woody, fibrous, and horizontal. The stems, which are 
many, divide into slender branches, covered with a greyish brown bark. The 
leaves arise alternately upon the branches, supported upon long petioles, 
composed of three broadly, and almost cordate-ovate, pointed leaflets, entire, 
or lobed and angled, about threeinches long, and two broad; the terminal leaf- 
let is considerably larger than the two lateral, which last are nearly sessile, of 
a deep shining green colour above, glabrous, or sometimes downy beneath. 
K2 
