5 8 KEY TO GENERA AND SPECIES 



105. Apex of the blade blunt or rounded. Conn, 

 southward along the coast, also in the Mis- 



Fig. 102. Balm of Gilead. 



sissippi valley. (Fig. 101.) Downy Pop- 

 lar, Swamp Cottonwood, River Cotton- 

 wood, Populus heterophylla L. 

 105. Apex of the blade tapering to a very sharp 

 point. Cult, and escaped. Probably na- 

 tive in Eurasia. (Fig. 102.) Balm of 

 Gilead, Balsam, Populus candicans Ait. 



WALNUT. Leaves compound. Leaflets averaging 

 ii to 23. Fruit enclosed in a husk which 

 does not split open at maturity. Nut 

 roughened with sharp points or ridges. 



