180 



ANACARDIACEAE. 



inn 



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, pi. 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, pi. 3; Hitchcock (3), 11; Greene, Ottawa Natu- 

 ralist, 24:139. R. javanicu (R. semialata Osbeckii). Shira- 

 sawa, 236, pi. 2. R. succedanea. Shirasawa, 233, pi. 1. R. 



