RANUNCULACEAE. 



[VOL. II. 



i. Batrachium trichophyllum (Chaix) 



Bossch. White Water- Crowfoot. 



(Fig. 1626.) 



Ranunculus trichophyllus Chaix in Vill. Hist. PI. 

 Dauph. 1:335. 1786! 



Batrachium trichophyllum Bossch, Prodr.Fl. Bat 5. 1850. 



Ranunculus aquatilis var. trichophyllus A. Gray, Man. 

 Ed. 5, 40. 1867. 



Ranunculus aquatilis var. caespitosus DC. Prodr. i: 26. 

 18*4. 



Submerged; stems branching, usually i 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 lapsing when withdrawn from the water, repeatedly 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 but beakless. 



In ponds and streams. Nova Scotia to British Colum- 

 bia, south to North Carolina and California. Also in 

 Europe and Asia. A variable species. The so-called 

 var. caespitosus is a small mud form. June-Sept. 



2. Batrachium divaricatum (Schrank) Wimm. 

 Stiff White Water-Crowfoot. (Fig. 1627.) 



Ranunculus divaricatus Schrank, Baicr. Fl. 2: 104. 1789. 

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



Ranunculus 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 stem, rigid when withdrawn from the water and nearly ses- 

 sile; 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. 



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



Gray. Ivy-leaved Crowfoot. 



(Fig. 1628.) 



Ranunculus hederaceus 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 or broadly 

 ovate in outline, 3-5 lobed, 3 // -6 // long, 5 // -io // 

 broad, the lobes obtuse; flowers white, 2 // ~3 // 

 broad; head of fruit globose, 2" wide; achenes 

 rugose, minutely beaked. 



In ponds and pools, Newfoundland and southeastern 

 Virginia. Naturalized from Europe. June-Aug. 



