1 14 lVj'omi?i£' Experiment Station. 



1 or 2 inches long, coarsely toothed or indistinctly lobed, both faces 

 green and rather sparsely appressed-hispidulous, the hairs of the 

 upper surface stouter and more enlarged at base ; flowers many, 

 small, orange-colored, sessile, or nearly so, in the forks and axils; 

 ovary subcyhndric, less than one-half inch long at flowering time 

 and after ; calyx-lobes slenderly subulate at flowering, almost as 

 long as the ovary ; petals 5 only, about 4 Unes long ; stamens few ; 

 filaments filiform ; anthers suborbicular ; capsule and seeds un- 

 known. A very well marked species, certainly aUied to the Mexi- 

 can M. aspera, but much larger and more diffusely branching, the 

 leaves relatively broader." 



It is probably quite local ; collected in a canon leading to the 

 Platte River, July 13, 189-1 (No. 439). 

 Mentzelia nuda, T. & G. Fl. N. A. i, 535 (1840). 



Frequent, and always in abundance; sandy plains and hillsides ; 

 somewhat variable as to habit. 



Big Sandy, July 18, 1892 ; Grant, July 8, 1894 (No. 338); Cum- 

 mins, July 29, 1895 (No. 1470). 

 Mentzelia ornata, T. & G. Fl. N. A. i, 534 (1840). 



Also common on sandy foothills near the Platte and its tribu- 

 taries. 



Fairbanks, July 14, 1894 (No. 486); Big Horn Mountains, Au- 

 gust 5, 1892. 



Mentzelia pumila, T. & G. 1. c. 



On a stony, gravelly hillside, Cummins, July 29, 1895 (No. 1436). 



CACTACE^. 



It is not at all probable that the following numbers represent at 

 all adequately our CactacecE, but the difficulty of preparing good 

 specimens has caused them to be neglected. 

 Cactus viviparus, Nutt. in Fraser's Cat. (1813). 



This is exceedingly rare ; only two plants thus far observed. 



lone Ranch, on Laramie River, August 10, 1895 (No. 1865). 

 Echinocactus Simpsoni, Engelm. Trans. St. Louis Acad, ii, 197 

 (1863). 



Frequent on the plains and in the valleys of the Laramie range. 



Laramie, June 15, 1894 (No. 75). 



