186 AN ACARDIACEAR. 
Cotinus. Smoke Bush. 
(Family Anacardiaceae). 
Shrubs or small trees with 
free-flowing gummy aromatic sap: 
deciduous. Twigs round, moder- 
ate, brown or _ purplish, with 
prominent lenticels, glabrate: . 
pith moderate, round, brown, con- 
tinuous. Buds_' small, _ solitary, 
sessile, round-ovoid, often com- 
pressed, with 1 or 2 pairs of ex- 
posed glabrous scales. Leaf-scars 
alternate, clustered above, cres- 
cent-shaped or 3-lobed, raised: 
bundle-traces 3: stipule-scars lack- 
ing. (Rhus). 
The American smoke bush or 
chittam wood is counted among 
our very rare or local native 
plants though it occurs from Ala- 
bama to Texas and extends as far 
north as Forsythe on the White 
River in Missouri, where it grows 
along the cliffs. 
Buds alternate: leaf-scars lobed. (1). C. americana. 
Buds acute from the front: leaf-scars not lobed. 
(2). C. Coggygria. 
Winter-character references:—Cotinus coggygria (Rhus 
Cotinus). Schneider, f. 79; Willkomm, 41, f. 67. Rhus cana- 
densis (R. aromatica). Brendel, pl. 3; Hitchcock (3), 12, 
(4), 135, f. 37-39. R. copallina. Blakeslee & Jarvis, 342, 526; 
Hitchcock (1), 4, f. 7. R. glabra. Blakeslee & Jarvis, 342, 
526; Brendel, pl. 3; Hitchcock (3), 11; Greene, Ottawa Natu- 
ralist, 24:139. R. javanica (R. semialata Osbeckii). Shira- 
sawa, 236, pl. 2. R. succedanea. Shirasawa, 233, pl. 1. R. 
