Fig. 12 



Wolf River. Petiole long; blade often only slishtly folded, narrow at base 

 and apex (A); serrations coarse and dull, often double (B). 



PhoU) by R. L. Coffin. 



Fig. 13. — Yellow Tr.^xsparent. Blade medium size, rather broad at base and narrow 

 at apex (A), more or less folded (B), more or less waved, and often spiral (C); serra- 

 tions rather dull, shallow and quite regular (D). 



