RYDBERG: STUDIES ON THE ROCKY MOwnTAIN FLORA 311 
Ipano: Lewiston, June 13, 1896, Heller 3244. 
New Mexico: Mesilla, June 3, 1897, Wooton 84. 
WyominG: Platte River, July 14, 1894, Aven Nelson 483; Snake 
River, 1900, C. C. Curtis. 
ARIZONA:- 1876, Palmer 448. 
Chenopodium succosum A. Nels. is in my opinion a synonym 
of C. rubrum L., being the common American form thereof, and 
C. desiccatum is probably only a small form of C. oblongifolium 
(S. Wats.) Rydb. 
Chenopodium 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. opulifolium 
Schrad. of Europe, not known as occurring in this country. C. 
viride and C. opulifolium were based on the same illustration. 
Monolepis spathulata A. Gray has been collected in Idaho. 
Atriplex odontophora Rydb. is not a synonym of A. canescens 
(Pursh) James but of A. aptera A. Nels. instead. 
Atriplex buxifolia sp. nov. . 
simple branches, 3-4 dm. high; leaves sessile, elliptic or oval, thick, 
12cm. 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. Nuttallit 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, 
Wyominc: Dayton, Sheridan County, September 1899, F. 
Tweedy 2656 (type, in herb. N. Y. Bot. Garden). 
‘ Atriplex tetraptera (Benth.) Rydb. comb. nov. 
Obione fetraptera 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 have 
4 broad sinus at the apex, and in that the free portion of the 
