a b c d 6 e* 22 



fs Lance-obovate, 4-6 in., cuneate b., acute or acuminate a., very lustrous ab., 

 thick and with short stems; fr. dry drupe. 



SWEET LEAF (Symplocos tinctoria). 



f* Rhombic-lanceolate to ovate, with long slender stems, cuneate to nearly 



rounded b., acuminate a.; a tree of the eastern foot-hills of the Rocky 



Mountains; fr. capsule. . .LANCE-LEAF COTTONWOOD (Populus acuminata). 



f 5 Ovate, cuneate to rounded b., acute to acuminate, strongly reticulate, 



whitish and often rusty bn.; fr. capsule. 



BALSAM POPLAR (Populus balsamifera) . 



f6 Heart-shaped, 3-8 in., with long round stems; fr. capsule; Ivs. 

 g Acuminate, whitish and often rusty bn. 



B ALM-OF-GILEAD ( Popu lus candicans ) . 

 g 2 Obtuse to subacute a., hairy bn. and on stems. 



SWAMP POPLAR (Populus heterophylla) . 

 f7 Ovate-oblong, 1-3 in., rounded or obtuse and more or less inequilateral b. ; 



fr. coriaceous drupe PLANER-TREE (Planera aquatica) . 



fs Oblong, 2-4 in., acute or rounded both ends, lustrous and veins impressed 

 ab., obscurely crenate-serrate; a very small tree or shrub of the southern 



states; fr. drupe-like YELLOW BUCKTHORN (Rhamnus Ccwoliniana) . 



f 9 Obovate, 4-8 in., obtuse or acute b., acute or acuminate a., regularly 



crenate ; fr. an acorn Cow OAK ( Quercus Michauxii) . 



f 10 Deltoid-ovate, truncate or wide cordate b., acute or short-acuminate, stems 

 long and laterally compressed; fr. capsule. 



COTTONWOOD (Populus deltoides) . 



