102 BOTAiJrr. 



upon the barren slioots, very fleshy, lanceolate, sessile, acute ; cyme much 

 branched, scorpioid and expanding; flowers bright yellow, nearly sessile, 

 pentamerous ; petals linear-lanceolate, acuminate, twice longer than the sub- 

 ulate sepals. — Stems 3-6' high ; leaves 2-4" long ; flowers large and showy, 

 3 4" long ; growing on dry slopes. Cascade Mountains, Oregon, (Newberry,) 

 and both sides of the Rocky Mountains from latitude 55° to Colorado. 

 Toyabe and East Humboldt Mountains, Nevada, and in the Wahsatch; 

 6-8,000 feet altitude; June-September. (386.) 



Sedum debile. Grlabrous ; stems weak, decumbent or suberect, 

 numerous from slender clustered rootstocks, simple or somewhat branched ; 

 leaves small, sessile, scatteredj crowded upon the barren shoots, very fleshy, 

 flattened, roundish, entire ; cyme subtrichotombus, spreading, few- (3-15-) 

 flowered ; pedicels about equaling the ovate sepals ; petals yellow, lanceolate, 

 acuminate, twice longer than the sepals ; stamens 10, or fewer by abortion, 

 attached near the base of the petals ; styles 5, slender. — Stems 1-4' high ; 

 leaves 1-2" in diameter ; ilowers 3" long. Nearest S. spaisifiorufn, Nutt., 

 (which includes S. Torreyi, Don. ;) marked by its weak decumbent stems, 

 its few pedicelled flowers and rounded leaves. Found on rocky ridges on 

 the East and West Humboldt Mountains, Nevada, and in the "Wahsatch and 

 Uintas ; 5-10,000 feet altitude ; May-September. (387.) 



HALORAGEiE. 



HippUKis VULGARIS, L. New York to Kentucky, rare ; throughout 

 British America to Greenland and Behring Strait ; California, New Mexico, 

 (Fendler,) and Colorado, (Hall & Harbour.) Humboldt Valley below Cen- 

 terville, Nevada, and in the Wahsatch; 5-6,000 feet altitude. (388.) 



Mykiophyllum verticillatum, L. From Florida to Canada ; on the 

 Saskatchewan, (Bourgeau ;) Oregon, (Nuttall ;) Nebraska, (James ;) Texas. 

 Found in Ruby Valley, Nevada, and in the Uintas ; 6-8,000 feet altitude; 

 August, September. (389.) 



Callitriche verna, L. From New Jersey and Pennsylvania to Canada, 

 Minnesota, (Nicolet,) and the Saskatchewan; California. Ruby Valley, 

 Nevada, and the Uintas ; 6-8,000 feet altitude; August, September. (390.) 



Var. TEREESTRis, Gray. The terrestrial form, with smaller and narrower 

 leaves. In the Wahsatch and Uintas ; 6,000 feet altitude ; July. (391.) 



Callitriche autumnalis, L. From northern New York and Lake 



