ii6 



RANUNCULACEAE. 



Vol, II. 



I. Batrachium trichophyllum (Chaix) 



F. Schultz. White Water-Crowfoot. Fig. 



1927. 



Ranunculus irichophyllus Chaix in Vill. Hist. PI. Dauph. 



i: 335- 1786- 

 Batrachium trichophyllum F. Schultz, Arch. Fl. France 



et All. I : 107. 1848. 

 Ranunculus aquatilis var, irichophyllus A. Gray, Man. 



Ed. 5, 40. 1867. 

 R. aquatilis var. caespitosus DC. Prodr. i : 26. 1824. 

 R. aquatilis capillaceus DC. Prodr. i: 26. 1824. 



Submerged; stems branching, usually 1° long or 

 more. Leaves petioled, i'-2' long, flaccid and col- 

 lapsing when withdrawn from the water, repeatedly 

 forked into capillary divisions ; flowers white, 6"-9" 

 broad, on stout peduncles i'-2' long, blooming at the 

 surface of the water; head of fruit globose, 2" broad; 

 receptacle hairy ; achenes apiculate. 



In ponds and streams, Nova Scotia to British Colum- 

 bia, south to North Carolina and California. Also in 

 Europe and Asia. Consists, apparently, of numerous 

 races, differing in habit, in size of flowers, number of 

 stamens and shape of petals : several of these have been 

 recognized as species. Water-milfoil. Green eel-grass. 

 Pickerel-weed. June-Sept. 



2. Batrachium circinatum (Sibth.) Rchb. Stiff 

 Wliite Water-Crowfoot. Fig. 1928. 



Ranunculus circinatus Sibth. ; J. E. Smith, Fl, Brit. 2 : 596. 1800. 

 Batrachium circinatum Rchb. ; Spach, Hist. Veg. 7 : 201. 1839. 

 R. aquatilis var. divaricatus A. Gray, Man. Ed. 2, 7. 1856. 



Similar to the preceding species, but the leaves are shorter, 



less than i' long, spreading nearly at right angles from the 



stem, rigid when withdrawn from the water and sessile or 



nearly so; there appear to be no constant differences in flower 



or fruit. 



In ponds and slow streams, Ontario, New England, northern 

 New Jersey and Pennsylvania, and west to the Pacific Coast, ex- 

 tending south in the Rocky Mountains to Arizona. Also in Eu- 

 rope. Summer. Referred in our first edition to Batrachium 

 divaricatum (Schrank) Wimmer. 



Batrachium longirostre (Godr.) F. Schultz, if distinct from this 

 species, differs in having a longer beak to the achene. 



3. Batrachium hederaceum (L.) S. F. Gray. 

 Ivy-leaved Crowfoot. Fig. 1929. 



Ranunculus hcderaceus L. Sp. PI. 556. 1753. 



Batrachium hederaceum S. F. Gray, Nat. Arr. Brit. PI. 

 2 : 721. 1821. 



Semi-aquatic, rooting extensively at the joints, 

 branching, entirely glabrous. Leaves floating, or 

 spreading on the mud, semi-circular, reniform or 

 broadly ovate in outline, 3-5-lobed, 3"-6" long, 5"- 

 10" broad, the lobes obtuse) flowers 2"-3" broad; 

 head of fruit globose, 2" wide; receptacle glabrous; 

 achenes minutely beaked. 



In ponds and pools, Newfoundland ; southeastern Vir- 

 ginia and Maryland. Naturalized from Europe. June- 



