474 AMMIACEAE 



Stylopodium flat or obsolete. 



Fruit without ribs, spiny. 2. Sanicula. 



Fruit ribbed, spineless. 



Ribs filiform. 12. Taenidia. 



Ribs corky, at least the lateral ones. 

 Oil tubes continuous around the 



seed cavity. 7. Bupleurum. 



Oil tubes 2-3 in the intervals. 13. Sium. 



I. Hydrocotyle L. 



Leaves nearly orbicular, peltate. 



Umbels simple, rarely slightly proliferous; pedicels slender. I. H. umbellata. 

 Umbels, at least some of them proliferous; pedicels or some 

 of them short. 

 Fruit notched at each end. 2. H. Canbyi. 



Fruit not notched at either end. 3. H. verticillata. 



Leaves nearly orbicular, cordate or reniform, not peltate. 



Leaves 5-13 Iobed; umbels nearly sessile. 4. //. americana. 



Leaves 3-7 cleft; umbels long-peduncled. 5. H. ranunculoiies. 



1. H. umbellata L. In swamps and low grounds: E. Mass. to 



Fla. and the W. I., Minn., Tex. and Mex. Also in S. Am. 

 Conn. Rare and local along the coast, decreasing inland into 



Litchfield Co., unknown elsewhere. 

 N. Y. Local on L. I. and S. I. and in Westchester Co., unknown 



northward. 

 N. J. Rare in Passaic Co., thence wanting to Middlesex and 



Monmouth counties, thence increasing southward, but unknown 



in the pine-barrens. 

 Pa. Bucks, Philadelphia and Delaware counties. 



Tertiary, not on Beacon Hill, common elsewhere; Cretaceous, 

 common: Older Formations, scattered and rare. 153-220 days. 

 Sea level-850 ft. 



2. H. Canbyi C. & R. In moist ground: N. J. to Md. 



Known in our range only from along the coast in Cape May 

 Co.; and in Bucks Co., Pa. 



3. H. verticillata Thunb. In moist soil: Mass. to Fla., west to 



southern Cal., and in Central and South America. 



Known in our area, only from the coastal part of N. J. from 

 Monmouth to Cape May counties; not in the pine-barrens nor ap- 

 parently in N. Y. or Conn. 



4. H. americana L. In wet places: N. S. to Minn., Pa. and N. 



Car. 



