Davis: RANUNCULI OF NORTH AMERICA. 491 



R. hyperboreus var. natans REGEL, Bull. Soc. Nat. Mosc. 



34: pt. 2: 43. 1861. 



Much like R. hyperboreus, but differing in having leaves 

 larger, reniform or truncate at base, lobes 3 to 5, often more 

 rounded : petals much larger ; receptacle thickened and fleshy : 

 head of fruit larger. Creeping and rooting in mud or some- 

 times floating in shallow water. Rockies of Colorado. Also 

 northern Asia. 



68. R. hyperboreus ROTTB. Skrift. Kjoeb. Selsk. 10 : 458. 

 t. ./. f. 16. 1770. 



Low creeping plant with slender and glabrous stems and pet- 

 ioles : one or two leaves from each (rooting) node, broadly 

 ovate with rounded or truncate bases, 3-lobed or slightly cleft, 

 margins of lobes nearly entire ; petioles sheathing at the base : 

 flowers minute, few, yellow ; petals about equalling the reflexed 

 sepals ; peduncles i inch or less in length : akenes hardly com- 

 pressed ; beak almost wanting : head of fruit globose, hardly 2 

 lines broad. Wet soil. Greenland, Labrador, Arctic Alaska ; 

 also Europe and Asia. 



69. R. Lapponicus LINN. Sp. PL 553. 1753. 

 Anemone nudicdulis GRAY, in Bot. Gaz. n : 17. 1886. 



Scapose from filiform rootstocks, 3 to 6 inches high : radical 

 leaves long-petioled, 3-parted, the divisions obovate-cuneate, 

 obtuse, crenate or lobed : scape slender, taller than the leaves, 

 often with a lobed, bract-like leaf : flower solitary, yellow ; 

 petals 5 to 6 ; sepals of about the same length, reflexed : akenes 

 a line or more long, ovate, tapering into the persistent, hooked 

 beak. North shore of Lake Superior, west to the Rockies, 

 north to Arctic America ; also Europe and Siberia. 



70. R. delphinifolius TORR. ex Eaton, Man. 2 ed. 395. 1818. 

 R. multifidus PURSH, Fl. 2 : 736. 1814. Not Forsk. 



R. flaviatilis BIGEL. Fl. Bost. i ed. 1 : 39. 1814. Not 



Willd. 

 R. lacustris BECK & TRACY, N. Y. Med. & Phys. Journ. 



2 : 112. 1823. 



R. BeckiiG. DON, Gen. Syst. i : 39. 1831. 

 R. Purshitv&r. aquatilis LEDEB. Fl. Ross, i : 35. 1841. 

 R. multifidus var. terrestris GRAY, Man. 5 ed. 41. 1867. 



Aquatic or partly emersed, with long fistulous stems : sub- 



