Proceedings of the Ohio State Academy of Science 163 



Order, Sapindales. 



Anacardiaceae. Sumac Family. 



52. Rhus L. Sumac. 



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

 milky sap. Fruit a small, red or gray drupe, in panicles. 



1 . Petioles not completely covering the axillary buds ; leaflets entire. 2. 



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



2. Rachis of the leaf wing-margined; leaflets 7-31; tw^igs and the red 

 drupes pubescent. R. copallina. 



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. Jiirta. 



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



1. Rhus copallina L. Dwarf 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 dry soil. Me. and Ont. to Fla., Minn., Neb., Tex., 

 and Ohio. 



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

 tree or shrub with red, pubescent 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. N. S. to Ga., Ont., S. Dak., Mo., Miss., and 

 Ohio. 



3. Rhus glabra L. Smooth Sumac. A shrub or small 

 tree with dense panicles of small crimson drupes covered with 

 short acid hairs. Noted for its beautiful, brilliant, red-colored 

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

 sides and bluffs. N. S. to Br. Col, Fla., Miss, Ariz., and Ohio. 



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

 tree, very poisonous to the touch. Drupes gray, glabrous, in loose 

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

 Minn., Neb., Ark., and Ohio. 



53. Cotinus Adans. Smoketree. 

 Shrubs or small trees with resinous sap, with buds clustered 

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



