494 MINNESOTA BOTANICAL STUDIES. 



77. R. arnoglossus GREENE, Pitt. 4: 143. 1900. 



Plant tufted, about 6 inches high : leaves feather-veined, 

 elliptic and elliptic-lanceolate, entire ; petioles of all shorter 

 than the blade, sheathing at base : flowers many, large ; petals 

 5, obovate, obtuse, commonly persistent with the sepals : akenes 

 many : head dense, globose. Subalpine in the Ruby mountains 

 of eastern Nevada. 



78. R. unguiculatus GREENE, Pitt. 4: 142. 1900. 



Stem i foot or more high, solitary : radical leaves I or 2 

 only, erect, elliptical, or obovate-elliptic, acute, entire or ob- 

 scurely denticulate, 2 to 3 inches long ; petioles as long ; stem 

 leaves narrower, short-petioled : flowers 2 to 4, or more in the 

 large plants ; peduncles long, puberulent, naked ; petals about 

 10, persistent, narrow, claw y 2 line long ; sepals narrow, 

 spreading, deciduous : akenes glabrous, obliquely obovoid, 

 slightly compressed ; beak stout, slightly recurved : head de- 

 pressed globose. 11,500 feet. Southern Colorado. C. F. 

 Baker, August 28, 1899. 



79. R. ambigens WATS. Bibl. Index, i : 16. 1878. 



R. Flammula PURSH, Fl. 2: 391. 1814. Not Linn. 



R. Lingua PURSH, 1. c. Not Linn. 



R. alismafolius BENTH. PI. Hartw. 295. 1848. In part. 



Not Geyer. 

 R. obtusiusculus BRITTON, 111. Fl. 2: 76. 1895. Not 



Raf. 



Plant 2 to 3 feet high, stout, glabrous or nearly so, erect, but 

 sometimes rooting at the lower nodes, hollow : leaves usually 

 on short petioles with broad, membranous, sheathing bases ; 

 blades lanceolate with tapering bases, serrate, denticulate or 

 entire, 2 to 4 inches long: petals 5 to 7, yellow, 2 to 3 lines 

 long ; sepals shorter : akenes small, obliquely oval, compressed, 

 thickened along one margin ; beaks subulate, narrow, erect or 

 little curved, nearly as long as akene body : head of fruit glo- 

 bose. Wet grass lands. Mountains of Georgia and Tennes- 

 see to Missouri, north and east to Canada and New England. 



Var. obtusiusculus n. var. 

 R. obtusiusculus RAF. in Desv. Journ. Bot. 1 : 225. 1808. 



Differs from the type in its slender, straight, erect stem : its 

 single root, like an annual, and its linear-lanceolate sepals. 



