CPC RR AONO sie aa 
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1921] 
PAYSON—MONOGRAPH OF THE GENUS LESQUERELLA 177 
common on the plains, Laramie, June 1, 1894, Nelson 3949 (Rky. 
Mt. Herb.); open dry flats, Laramie, June 20, 1900, Nelson 
7275 (Rky. Mt. Herb., Mo. Bot. Gard. Herb., Geo. Osterhout 
Herb., and U. S. Nat. Herb.); Laramie River, June 15, 1891, 
Buffum 61 (Rky. Mt. Herb.); railroad grade, Rock River, June 
18, 1901, Goodding 26 (Rky. Mt. Herb.); Fort Steele, Carbon 
County, May 25-June 10, 1901, T'weedy 4489 (U. S. Nat. Herb.); 
T. B. Ranch, Carbon County, June 20, 1901, Goodding 56 (Mo. 
Bot. Gard. Herb. and U. S. Nat. Herb.); dry soil near Washing- 
ton Ranch, June 30, 1901, Merrill & Wilcox 788 (U. S. Nat. 
Herb. and Rky. Mt. Herb.); dry soil 35 miles north of Point of 
Rocks, June 21, 1901, Merrill & Wilcox 521 (Rky. Mt. Herb.); 
Fort Bridger, July, 1873, Porter (U. S. Nat. Herb.); Carter, 
June 25, 1896, Jones (U. S. Nat. Herb., Mo. Bot. Gard. Herb., 
and Rky. Mt. Herb.). 
Colorado: Clear Creek, June, 1873, Wolfe (U. S. Nat. Herb.); 
Rocky Mountains, lat. 40—41?, 1868, Vasey 4? (Mo. Bot. Gard. 
Herb.); Livermore, Larimer County, July 25, 1904, Osterhout 
2864 (Geo. Osterhout Herb.); Livermore, Larimer County, 
May 27, 1919, Osterhout 5888 (Geo. Osterhout Herb.); Sterling, 
Logan County, June 10, 1896, Osterhout 1108 (Geo. Osterhout 
Herb.); Windsor, Weld County, June 6, 1896, Osterhout 1102 
(Geo. Osterhout Herb.); Hugo, June 12, 1907, Marsh (U. S. 
Nat. Herb.); Crow Creek, June 26, 1896, Knowlton 94 (U. S. 
Nat. Herb.); Evans, June 1, 1908, Johnston 164 (Mo. Bot. Gard. 
Herb.); lat. 41?, 1862, Hall & Harbour 48 (Mo. Bot. Gard. 
Herb.); Denver, July, 1884, Ball (U. S. Nat. Herb.); north of 
Craig, Routt County, June 10, 1902, Osterhout 2621 (Geo. Oster- 
hout Herb.); upper juniper area, west of Delta, June 6, 1909, 
Tidesirom 2176 (U. S. Nat. Herb.). 
Utah: Pahria Canyon, May 26, 1894, Jones 5297a (U. S. Nat. 
Herb.). 
Arizona: 1869, Palmer (U. S. Nat. Herb.). 
This species has a most interesting geographic distribution. 
East of the mountains from Montana to south-central Colorado 
it is a common plant, as it also is in southern Wyoming. Its 
southern extension to Arizona, however, is marked by very few 
collections. These collections are quite typical and evidently 
