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 inthe Ruby mountains 
of eastern Nevada. 
78. R. unguiculatus GREENE, Pitt. 4: 142. 1900. 
Stem 1 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 % 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, 1: 16. 1878. 
FP. Flammula Pursu, Fl. 2: 391. 1814. Not Linn. 
wt. Lingua Pursn, 1. c.. Not Linn. 
RP. alismefolius BENTH. Pl. Hartw. 295. 1848. In part. 
Not Geyer. 
fe. obtustusculus Britton, Ill. 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 Rar. 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. 
