183 



SUMMER KEY TO THE SPECIES. 



Page. 



1. Leaf-petioles winged; leaHets with entire margins except near apcl, ..K. copaUina 186 



1. Leaf petioles not winged; leaflets either with entire or serrate margins 2 



2. Leaflets 7-13, with entire margins S. Vernix 184 



2. Leaflets 11-31, with serrate margins 3 



S. Leaflets glaucous bcueath: twigs smooth; shrubs E. glabra 183 



3. Leaflets not glaucous beneath; twigs densely hairy; small trees E. typhina 185 



WINTER KEY TO THE SPECIES. 



1. Terminal bud present; fruit white, smooth, in loose, drooping, grape-like clusters 



frequents swamps; leaf-scars broad, do not encircle buds; juice poisonous 



K. Vemix 184 



1. Terminal bud absent; fruit red, hairy. In •jompact erect clusters; frequents dry soils; 



leaf-scars encircle or almost encircle buds; juice not poisonous, 2 



2. Twigs stout, with watery Juice; leaf-scars broadly crescent-shaped E. copallina 186 



2, Twigs very stout, with milky juice; leaf scars narrower 3 



8. Twigs densely hairy E. typhina 185 



3. Twigs smooth E. glabra 182 



