482 MINNESOTA BOTANICAL STUDIES. 



41. R. McCallai n. sp. 



Stem erect, slender, 12 to 20 inches high, branched toward 

 the top, somewhat pubescent : radical leaves hairy, on slender 

 hairy peduncles 2 to 4 inches long ; blade 3~5-parted nearly or 

 quite to the base, segments less than i inch long, cuneate, di- 

 vergent, cleft into 2 to 3 linear lobes ; stem leaves none or bract- 

 like, subtending the branches, or a small one near the middle : 

 flowers 2 to 6, large, yellow ; petals 5, obovate, entire or obcor- 

 date ; sepals shorter, spreading, hairy : carpels ovate in a glo- 

 bose head ; styles subulate, hooked : receptacle glabrous. Col- 

 lected by W. A. McCalla (2113) near Banff, Alberta, Canada, 

 July, 1899, in wet meadows. Differs from R. acris in its 

 leaves, usually naked stem, etc. 



42. R. pedatifidus J. E. SMITH in Rees' Cycl. No. 72. 

 1813-16. 



R. arcticus RICHARDS, in Frankl. ist Journ. i ed. App. 



741. 1823. 



R. affinis R. BR. Parry ist Voy. App. 265. 1824. 

 R. amcenus LEDEB. Fl. Alt. 2: 320. 1830. 

 R. auricomus HOOK. f. Arc. PL 283, 312. 1862. 



Plant sparsely hairy, 3 to 15 inches high, slender, sometimes 

 branched : radical and lower stem leaves petioled, broadly 

 ovate, crenate, toothed, lobed, or cleft nearly to the base into 

 segments which are often narrow ; upper stem leaves deeply 

 cleft, nearly sessile, lobes narrow : petals yellow, 3 to 4 lines 

 long ; sepals shorter, pubescent beneath : akenes often hairy? 

 with short beak : head oblong to cylindric. Qjiebec to Arctic 

 regions, west to Alaska ; Rockies to Colorado and Arizona. 

 Ledeb. Ic. /. nj. 



Var. cardiophyllus BRITTON, Bull. Torr. Club, 18 : 265. 



1891. 



R. cardiophyllus HOOK. Fl. I : 14, and vars. t. 6. 1829. 

 R. affinis var. lasiocarpus TORR. Bot. Wilkes Exp. 213. 



1854. 

 R. affinis var. leiocar-pus TRAUT. ex Midden. Reise in 



Sibir. 62. 1856. 

 R. affinis var. cardiophyllus GRAY, Proc. Am. Acad. Phil. 



1863: 56. 



R. affinis var. validus GRAY, Proc. Am. Acad. 21 : 371. 

 1886. 



