Proccedino;s of the Ohio State Academy of Science 163 



Order, Sapindales. 



Anacardiaceae. Sumac Family. 



52. Rhus [.. Sumac. 



Small trees, shrubs, or climbing vines with acrid resinous or 

 milky sap. I'Vuit a small, red or gray drupe, in panicles. 



1. Petioles not conii)letfly covering tlie axillary buds; leaflets entire, 'i. 



1. Petioles covering the axillary buds; leaflets serrate. 3. 



2. Rachis of the leaf wing-margined; leaflets 7-31; twigs and the red 

 drupes pubescent. A'. cdpaU'uia. 



2. Rachis not winged; leaflets 7-13; poisonous to the touch; twigs 



and the gray drupes glabrous. R. vernix. 



3. Leaves and twigs velvety-pubescent. R. hirta. 



3. Leaves and twigs glabrous, somewhat glaucous. R. glabra. 



1. Rhus copallina L. Dw;arf sumac. A shrub or small 

 tree with a dense terminal panicle of small globose, crimson 

 drupes, covered with short acid hairs. Leaves used for tanning 

 purposes. In (lr\' soil. Ale. and Out. to Fla., Minn., Neb., Tex., 

 and Ohio. 



2. Rhus hirta ( L. ) Sudw. Staghorn Sumac. A small 

 tree or shrul) with red. pubesceiU drupes. Wood very soft and 

 brittle. In dry or rocky soil. A good lemonade or "sumacade" 

 is made by steeping the drupes and sweetening to taste. Leaves 

 used for tanning. X. S. to Ga., Ont., S. Dak., Mo., Miss., and 

 Ohio. 



3. Rhus glabra L. .Smooth .Sumac. A shrub or sm.ill 

 tree with dense ])anicles of small crimson drupes covered with 

 short acid hairs. X(jted for its beautifid, brilliant, red-colored 

 leaves in autuiun. Leaves used for tanning. Common on hill- 

 sides and bluffs. X. S. to IJr. Col., Fla., Miss, Ariz., and Ohio. 



4. Rhus vernix L. Poison Sumac. A shrtib or small 

 tree, very i)oisonous to the touch. Drupes gray, glabrous, in loose 

 axillary panicles. In swamps and wet places. X. S. to Fla., 

 Minn., Xel).. .\rk., and Ohio. 



53. Cotinus .\dans. Smoketree. 

 Shrubs or small trees with resinous sap, with buds clustered 

 at the tips of the twigs. Drupes compressed, gibbous. 



