SANTALACE. 
Comandra pallida A. DC. Prodr. xiv, 636 (1857). 
Table-land: Hot Springs, altitude 1,100 m., June 19; Hermosa, altitude 1,100 m., 
June 23 (No. 991). 
EUPHORBIACESA.. 
Euphorbia glyptosperma [Engelm. Bot. Mex. Bound. 187 (1859). 
Sandy soil: Hot Springs, altitude 1,050 m., August 9 (No. 992). 
Euphorbia hexagona Nutt.; Spreng. Syst. iii, 791 (1826). 
Sand draw: Hot Springs, altitude 1,150 m., August 9 (No. 993), 
Buphorbia marginata Pursh, Fl. 1i, 607 (1814), 
Hot Springs, altitude 1,050 m., August 9 (No. 994). 
Euphorbia dentata Mx. FI. ii, 211 (1803). 
A very variable species. In the same spot were found specimens which might be 
referred to /. dentata proper, to variety rigida, and to variety linearis. Some even 
approached /. cuphosperma Engelm,, which seems to me, however, to be a variety of 
£. dentata, In several cases the seeds approach those of /, cuphosperma, being more 
or less ovoid-pyramidal, with a groove on one side. The leaves are from broadly 
ovate to linear, and from coarsely dentate to nearly entire. 
Sandy soil: Hot Springs, altitude 1,05u m., June 19 and August 3 (No. 995). 
Euphorbia dictyosperma Fisch. & Mey, Ind. Hort. Petrop. ii, 87 (1835). 
Hot Springs with the preceding, June 17 and August 3 (No, 996). 
Euphorbia montana robusta Engelm. Bot. Mex. Bound. 192 (1859). 
Hillsides: Hot Springs, altitude 1,100 m., June 17 (No. 997). 
Croton texensis (Klotzsch) Muell. Arg, in DC, Prodr. xv, pt. 2, 692 (1866); Hen- 
decandra texensis Klotzsch, in Eriehs. Archiv. i, 252 (1841). 
Sandy soil: Hot Springs, altitude 1,050 m., August 9 (No. 998), 
URTICACES. . 
Ulmus americana L. Sp. Pl. i, 226 (1753). 
Along Fall River, altitude 1,000 to 1,100 m., rare. August 8 (No. 999). 
Celtis occidentalis L. Sp. Pl. ii, 1044 (1753), 
Only one shrubby specimen seen, near Hot Springs, altitude 1,060 m., August 8 
(No. 1000), 
Urtica gracilis Ait. Hort. Kew. iii, 841 (1879). 
Not common: Custer, altitude 1,650 m., August 1 (No. 1001). 
Parietaria pennsylvanica Muhl.; Willd. Sp. Pl. iv, 955 (1805). 
In shady woods, rare: Hot Springs, altitude 1,050 m., June 13 (No. 1002). 
Humulus lupulus L. Sp. PL. ii, 1028 (1753). 
Along French Creek, below Custer, rare; altitude 1,500 m., July 22 (No. 1003). 
CUPULIFERS. 
Betula papyrifera Marsh. Arb. Amer. 19 (1785). 
Common in the Black Hills proper. Elk Canyon, altitude 1,200 m., June 29 
(No, 1004). 
Betula occidentalis Hook. Fl. Bor. Amer. ii, 155 [1838]. 
The common form in the Black Halls is a tree about 10m. high with leaves about 
as large as those of the preceding. In bloom: Custer, altitude 1,700 m., June 5; 
Little Elk Canyon, altitude 1,200 m., June 27 (No. 1005). Another form was found 
scarcely 4m, high with smaller, sharply and doubly serrate leaves, more glandular 
stem, shorter aments with shorter lateral lobes to the bracts. It approaches the 
next somewhat in habit and general appearance, but evidently belongs to B. occiden- 
talis. Near a brook: Oreville, altitude 1,625 m., July 23 (No. 1006). 
