Rydberg: Studies on the Rocky Mountain flora 311 



Idaho: Lewiston, June 13, 1896, Heller 3244. 



New Mexico: Mesilla, June 3, 1897, Wooton 84. 



Wyoming: Platte River, July 14, 1894, ^^'^^^ Nelson 483; Snake 

 River, 1900, C. C. Curtis. 



Arizona: i^-j 6, Palmer 448. 



Cheno podium succosum A. Nels. is in my opinion a synonym 

 of C. rubrum L., being the common American form thereof, and 

 C. desiccatiim is probably only a small form of C. oblongifolium 

 (S. Wats.) Rydb. 



Cheno podium lanceolatum Muhl. and C. paganum Reich., the 

 former an eastern plant and the latter a European weed, both 

 often erroneously known as C. viride L., have been collected in 

 Colorado. The original C. viride L. is the same as C. opuHfolium 

 Schrad. of Europe, not known as occurring in this country. C. 

 viride and C. opuHfolium were based on the same illustration. 



Monolepis spatludata A. Gray has been collected in Idaho. 



Atriplex odoyitophora Rydb. is not a synonym of A. canescens 

 (Pursh) James but of A. aptera A. Nels. instead. 



Atriplex buxifolia sp. nov. 



A suffruticose perennial; stem branched near the base, with 

 simple branches, 3-4 dm. high ; leaves sessile, elliptic or oval, thick, 

 1-2 cm. long; pistillate flowers in axillary clusters; fruiting bracts 

 ovate, acute, 4-5 mm. long, toothed on the margins, with thick, 

 often flattened processes on the faces. 



This is related to A. NnttalUi but distinguished by its short 

 oval or elliptic, often fascicled leaves, its simple wandlike branches 

 and small fruit. It grows on dry plains at an altitude of about 

 1,200 m. 



Wyoming: Dayton, Sheridan County, September 1899, F. 

 Tweedy 2656 (type, in herb. N. Y. Bot. Garden). 



Atriplex tetraptera fBenth.) Rydb. comb. nov. 



Obione tetraptera Benth. Bot. Sulph. 48. 1844. 



This has usually been regarded as the same as A. canescens 

 (Pursh) James but differs in its narrow, linear leaves, only 2-5 

 mm. wide, in its more strongly reticulate fruit wings, which ha\e 

 a broad sinus at the apex, and in that the free portion of the 



