522 



SANTAIiACEiE. 



Coniandra pallida A. DC. I'rodr. xiv, 0:5(3 (1S57). 



TaMo-land: Hot Spriugs, altitude 1.100 in., .Iuii<- 1*J; llcnno.sa, altitude 1,100 lu., 



Juno 23 (No, Wl). 



EUPHORBIACEiE. 



Euphorbia glyptosperma Eiigt-liii, IJot. Mux. Bound. 187 (1859), 



Sandy soil: Hot Springs, altitudo 1,0.')0 in., August U (No, U02), 



Euphorbia hexagona Nutt. ; Spreug. Syst, iii, 701 (1820). 



Sand draw : ]Iot Springs, altitudo 1,150 m., August I) (No. OOiJ), 



Euphorbia marginata Pursli, Fl. li, 007 (1814). 



ll(.t Springs, altitude 1,0.")0 m., August 9 (No. 994). 



Euphorbia dentata Mx. Fl. ii, 211 (1803). 



A very variable species. In the same spot were found specimens wliicli might 1)6 

 referred to Js, dentata proper, to variety rirjida, and to variety linearis. Some even 

 approached £. citjyhosjycnna Engehn,, ■which seems to me, however, to be a variety of 

 E. dentata. lu several cases the seeds approach those of A', cuphosperma, being more 

 or less ovoid-pyramidal, with a groove ou one side. The leaves are from broadly 

 ovate to linear, and from coarsely dentate to nearly entire. 



Sandy soil: Hot Springs, altitude 1,050 in,, June 19 and August 3 (No, 995). 



Euphorbia dictyosperma Fisch, iV Mey. Ind, Hort, Petrop, ii, 37 (1835). 



Hot Si)rings with the preceding, .Tune 17 anil August 3 (No. 996). 



Euphorbia montana robusta Engelm. Bot. Mex. Bound. 192 (1859). 



Hillsides: Hot Sjirings, altitude 1,100 m., June 17 (No, 997), 



Crotou texensis (Klotzsch) Muell. Arg. in DC. Prodr. xv, jit. 2, 692 (1866); llcn- 

 decandia tcxcnuifi Klotzsch, in Erichs. Archiv. i, 2.52 (1841). 



Sandy soil: Hot Springs, altitude 1,050 m., August 9 (No. 998), 



t URTICACEiE. 



Ulmus americaua L. Sp. PI. i, 226 (17.')3). 



Along Fall Pi\ er, altitude 1,000 to 1,100 m,, rare. August 8 (No, 999). 

 Celtis occidentalis E. Sp, I'l. ii, 1044 (1753), 



Only one shrubby sijccimcn seeu, near Hot Springs, altitude 1,000 ni., Augusts 

 (No. 1000). 

 Urtica gracilis Ait. Hort. Kew, iii, 841 (1879). 

 Not connnon: Custer, altituds^ 1,6.50 m., August 1 (No. 1001). 

 Parietaria permsylvaiiica Mulil. ; AVilld. Sj). PI. iv, 9.55 (1805). 

 In shady woods, rare: Hot Springs, altitude 1,050 m., June 13 (No. 1(H)2). 



Humulus lupulus L. Sp. Pi. ii. 1028 (1753). 



Along French Creek, below Custer, rare; altitude 1,5(K) ni., July 22 (No, 1003). 



' CUPULIFERiE. 



Betula papyrifera Marsh. Arb. Anier. 19 (1785). 



Conunon in the Black Hills proper. Elk Canyon, allitudi' l,2(Hl ni.. .lune 29 

 (No. KKM). 



Betula occidentalis Hocdi. Fl. l!or. .\mer. ii. 1.55 [1838]. 



The common form in the Black Hills is a tree about 10 m. high with leiives about 

 as large as those of tlie i)re(cding. In l>loom : Custer, altitude 1,100 m., June 5; 

 Little Elk Canyon, altitude 1,2(K) m., .June 27 (No. 1005). Another form was found 

 scarcely I m. high with smaller, sharjjly and doubly serrate leaves, more glandular 

 stem, shorter aments with shorter lateral lobes to the bracts. It ajjproaches the 

 next somewhat in habit and general appearance, but evidently belongs to II. occidcti' 

 taliH. Near a brook : Oreville, altitude 1,625 m., July 23 (No. 1006). 



