First Report on the Flora of Wyoming. 177 



EUPHORBIACE^. 



Euphorbia dentata, Michx. Fl. Bor. Am. ii, 211 (1803). 



Infrequent; observed but once; Hartville, July 15, 1894 (No, 

 549). 

 Euphorbia dictyosperma, Fisch. and Mey. Ind. Sem. Hort. Petrop. 

 li, 37 (1835). 



On sand dunes near Mexican Mines, July 21, 1894 (No. 581). 

 Euphorbia Fendleri, T. & G. Pac. R. R. Rep. ii, 175 (1855). 



Our Euphorbias seem to be confined to the warm sandy plains 



and canons of the eastern part of the state, particularly to the 



region of the Platte. This from Fairbanks, July 14, 1894 (No. 472). 



Euphorbia glyptosperma, Engelm.Bot. Mex. Bound. Serv. 187 (1859). 



Quite frequent ; Wheatland, June 29, 1891; Blue Grass Hills, 



July 8, 1894 (No. 370). 



Euphorbia hexagona, Nutt. Spreng. Syst. iii, 791 (1826). 



In a sandy canon leading to the Platte, Fairbanks, July 13, 1894 

 (No. 436). 

 Euphorbia montana, Engelm. Bot. Mex. Bound. Surv. 192 (1859). 



This is probably common throughout the state on stony, gravelly 

 hillsides. 



Inyan Kara Divide, August 29, 1892; Whalen Canon, July 18, 

 1894 (No. 529); Pole Creek, July 1, 1895 (No. 1400). 

 Euphorbia petaloidea, Engelm. 1. c. 



Not infrequent on sandy river bottonis. 



Uva, July 10, 1894 (No. 399); Willow Creek, July 22, 1894 

 (No. 631). 



Croton Texensis, Muell, Arg. in DC. Prodr. XV, part 2, 692 (1862). 

 On sandy river bottoms in the eastern part of the state. 

 Fairbanks, July 12, 1894 (No. 428); also at Fort Laramie. 



URTICACEiE. 



Humulus Lupulus, L. Sp. PI. 1028 (1753). 



Not infrequent in copses on river bottoms and in ravines. 



Whalen Canon, July 18, 1894 (No. 513). U^ild Hops. 

 Urtica Breweri, Watson, Proc. Am. Acad, x, 348 (1875). 



Abundant in Centennial Valley; not observed elsewhere; June 

 8. 1895 (No. 1273); August 25, 1895 (No 1862). Nctile. 



