648 



Anacardiaceae 



Rhus 



50 



Map 1346 



Floerkea proserpmacoides Will 



50 



Map 1347 



Rhus copallma L. 



o 50 



Map 1348 



Rhus Vernix L. 



of Sullivan County. This little annual when removed from the woods to a 

 rich, shady flower garden will persist as a weed. 



W. Que., Ont. and Wis., southw. to Del., Tenn., and Mo. 



153. ANACARDIACEAE Dumort. Cashew Family 



4594. RHtS L. Sum 



AC 



[Barkley. Monographic study of Rhus and allies in North and Central 

 America. Annals Missouri Bot. Gard. 24: 265-496. 1937.] 

 Leaflets normally more than 3. 



Rachis of leaf winged; branchlets pubescent 1. R- copallina. 



Rachis of leaf not winged; branchlets glabrous or pubescent. 



Leaflets entire or nearly so; fruit from very pale green to almost colorless, glab- 

 rous 2. R. Vernix. 



Leaflets regularly serrate to the base; fruit pubescent with red hairs. 



Branchlets below the inflorescence, lower surface of the leaflets, and rachis of 

 leaf glabrous ; branchlets more or less strongly angled ; hairs of fruit mostly 



0.15-0.3 mm long, obovoid, obtuse at the apex 3. R. glabra. 



Branchlets below the inflorescence, lower surface of the leaflets, and rachis more 

 or less pubescent; branchlets terete or nearly so. 

 First year branches pubescent; branchlets densely pubescent; hairs of fruit 



about 1 mm long, linear, and acicular at the apex 4. R. typhina. 



First year branches glabrous; branchlets varying from densely to sparingly 

 pubescent. 

 Hairs of fruit about 1 mm long, acicular at the apex; branchlets usually 



densely pubescent at first 5. X R. pulvinata. 



Hairs of fruit about 0.5 mm long, acute to blunt at the apex; branchlets at 



first sparingly pubescent, usually soon becoming glabrous 



3a. R. glabra var. borealis. 



Leaflets normally 3. 



Petiolules of leaflets generally more than 3 cm long; fruit pale green to colorless. 



Fruit glabrous, rarely with a few hairs 6 - R- radicans. 



Fruit pubescent, surface usually very papillose 6a. R. radicans var. littoralis. 



