310 Rydberg: Studies on the Rocky Mountain flora 



apex; stem leaves few, spatulate or oblanceolate, much smaller; 

 bracts linear or linear-oblanceolate, arcuate-recurved, spinulose- 

 tipped; involucre cylindroprismatic, 5 mm. long, angled and 

 grooved, strigose; lobes 6, subulate, recurved, spinulose-tipped, 

 the alternating ones somewhat narrower; perianth about 2 mm. 

 long, lobes ovate; stamens mostly 3 (?); filaments adnate to the 

 lower part of the perianth. 



This species is related to C. brevicornu Torr., and Torrey and 

 Gray included doubtfully Watson's specimens in that species.* 

 It differs in its broader lower leaves and its strict erect branches. 



Idaho: Big Butte Station, June 23, 1863, Edward Palmer 230 

 (type, in herb. Columbia University). 



Nevada: 1875, /. G. Lemmon; Big Bend of the Truckee, May 

 1868, S. Watson 1044. 



CHENOPODIACEAE 

 Chenopodium pratericola sp. nov. 



Annual ; stem 3-6 dm. high, striate and angled, nearly glabrous; 

 leaves petioled; blades oblong, lanceolate, or elliptic, 2-6 cm. long, 

 4-18 mm. wide, entire or with a short tooth on each side, usually 

 callous-mucronate, green and nearly glabrous above, more or less 

 mealy beneath, usually distinctly 3-nerved at the base; flowers in 

 small clusters forming rather dense spikes or panicles; sepals 

 scarious-margined, green on the back, slightly carinate; seeds 

 easily separating from the pericarp, black, shining, about 1.5 mm. 

 in diameter. 



This has been included in C. leptophyllum (Moq.) Nutt. by 

 most botanists although sometimes confused with C. oblongifolium 

 (S. Wats.) Rydb. on account of its broad leaf blades. It differs 

 from the former in its broader leaves, which are practically glabrous 

 on the upper side, distinctly 3-nerved at the base, and at least the 

 larger ones often toothed on the margins. From the latter it 

 differs in its thin, more glabrate leaves and less dense inflorescence. 



Kansas: Riley County, August 2, 1895, J. B. Norton 436 (type, 

 in herb. N. Y. Bot. Garden). 



Nebraska: Middle Loupe River, near Thedford, June 21, 

 1893, Rydberg 1386; Forks of Dismal River, July II, 1893, Rydberg 

 1835; Kearney County, June 13, 1891, Rydberg 318. 



Missouri: Courtney, June 25, 1896, Bush 367. 



* See Proc. Am. Acad. 8: 196. 1870. 



