460 STRUCTURE AND LIFE HISTORIES 



Eastern North America. The yellow water-crowfoot 

 (Ranunculus delphinifolius) is one of the commoner of the 

 40 to 50 North American species. It is found at the bor- 



FIG. 343. Lizard 's-tail (Saururus cernuus). Inflorescence, about 

 natural size. 



ders of quiet water, and the submerged leaves are filiformly 

 dissected, in marked contrast to those borne in the air. 



