496 MINNESOTA BOTANICAL STUDIES. 
ing over the wet ground. High altitudes, Sierra and Trinity 
Mts., California to Colorado and northward. 
Var. Populago n. var. 
fe. Populago GREENE, Erythea,3: 19. January, 1895. 
ft. Cusickiz Jones, Proc. Calif. Acad: Sci., Ser. 2, 5: @ige 
October; 1895. 
Like the type, but with radical leaves ovate, cordate; mar- 
gins slightly wavy. Southwestern Oregon, Idaho. 
83. R. Lemmoni Gray, Proc. Am. Acad. 10: 68. 1874. 
Stems scapose, tufted, 5 to 10 inches high: plant villous- 
pubescent on lower parts: leaves rather thick, lanceolate, en- 
tire: flowers I or 2 on a stem; petals about three lines long, 
obovate to oblong: akenes turgid, villous-pubescent, borne in 
an oval head. Rare. ‘Truckee and east part of Sierras, Cali- 
fornia. 
84. R. oblongifolius ELL. Sketch 2: 58. 1824. 
FR. Flammula Micux. Fl. 1: 221. 1803. Not Linn. 
R. Flammula var. laxicaulis Torr. & Gray, Fl. 1: 16. 
1838. 
RP. pusillus var. oblongifoliuns Torr. & GRay, 1. c. 17. 
FP. laxicaulis DARBY, Bot. S. St. 204. 1855. 
Annual; about 1 to 2 feet high, erect or ascending, rarely 
rooting at the lower nodes, branched above, many-flowered: 
leaves shaped nearly as in At. puszl/us, or sometimes broader : 
petals 5, yellow, longer than the sepals; stamens many: akenes 
few, often globular or slightly flattened, smooth or minutely 
punctate ; style deciduous: head of fruit globose. Aprilto Sep- 
tember. Wet grounds. Florida to southern Virginia, west to 
southern Missouri and Texas. 
85. R. hydrocharoides Gray, Mem. Am. Acad. 5: 306. 
1855. 
Stems ascending, 5 to 10 inches high, rooting at the lower 
nodes, with creeping, fistulous branches at the base: leaves 
mostly long-petioled, entirely or nearly so, usually less than 1 
inch long, rather succulent; basal leaves round-cordate to oval, 
blending into the form of the upper ones which are obovate to 
spatulate: petals 5 or more, 2 to 3 lines long; sepals much 
shorter : akenes small; beak narrow, short: head of fruit small, 
globose. In standing water and wet soil. Southwestern Ari- 
