WEST VIRGINIA GEOLOGICAL SURVEY 297 



ful proliferation when young. This effect, according to Dr. 

 Britton, formed the type of the Linnsean species, Datisca 

 hirta (L. Sp. PI. 1037) collected by Kalm near Philadelphia, 

 Pa. 



R. GLABRA L. Smooth Sumach. 



Frequent or very common in all parts of the State, in rocky 

 or barren soils. Randolph : Point Mountain, alt. 2,200 ft. ; 

 Cheat Mountains, alt. 2,700-3,600 ft. Cabell : near Barbours- 

 ville (James). Summers: near Hinton. Fayette : near Nut- 

 tallburg, not common (Ntittall). Hardy: near Moorefield 

 (Gamble). 



R. coPALLiNA L. Dwarf Sumach. 



Dry fields and rocky places. Wood : near Lockhart's Run, 

 plentiful. Webster: Buffalo Bull Mountains, alt. 2,575 ^t. 

 Randolph: Cheat Mountains, alt. 3,200 ft.; near Hodam (H. 

 H. Smith 1527). Preston: near Aurora (Air. & Mrs. 

 Steele). Monongalia : near Ice's Ferry. Fayette : near Nutt- 

 allburg, alt. 2,000 ft., common (Nnttall) ; and frequent 

 throughout the State. Mercer : Beaver Springs and Ingle- 

 side. 



R. VERNix L. Poison Sumach. Poison Elder. (R. venenata DC.) 

 Swampy places. Randolph : Stalnaker Run. Preston : 

 near Terra Alta, infrequent. 



R. RADicANS L. Poison Vine. Poison Ivy. Including (R. toxi- 

 codendron L.). 



Thickets and low grounds, very common throughout the 

 State. Monongalia : abundant everywhere in the neighbor- 

 hood of streams. Webster : Buffalo Bull Mountains, alt. 

 2,100 ft. (Millspangh) ; Hacker Valley (H. H. Smith 1532). 

 Kanawha: Pocotaligo. Gilmer: near Glenville (Mapel). 

 Fayette: near Nuttallburg (Nuttall). Summers: near Hin- 

 ton. Mason : near Point Pleasant. Mercer : Princeton, near 

 Ingleside and Wills.. 



R. AROMATiCA Ait. Fragrant Sumach. (R. canadensis Marsh.). 

 Dry or stony soils. Brooke : roadside between Wellsburg 

 and Bethany College (Merts & Guttenberg). Hardy: near 

 Moorefield (Gamble). 



COTINUS Adans. 

 C. coTiNoiDES (Nutt.) Britton. (Rhus cotinoides Nutt.). 



Established near Morgantown, Monongalia Co. (Sheldon.) 



