38 BOTANICAL INFORMATION. 



hirsutum; Trifolium, 105. (Passed through the belts of 



Mamillaria simplex ; Rumeco venosus ; Liliacea, 20 ; Phaca, 



22 ; Arenaria, 26 ; Lupinus pusillus ; (Enothera (37) pinnati- 



fida, in whose stead appears (Enothera, 38 ; Coreopsis tenui- 



folia ; Psoralea canescens,* Petalostemon violaceum, candidum, 



and villosum; Malva, 76; Hymenopappus corymbosus ; Allionia 



multiflora ; Calymenice ; (Enothera serrulata, Macranthera, 



Linum rigidum? 169; Psoralea, 223: Evolvulus; Ferula 



fceniculacea ; Phlox, 88; Labiata, 91; Potentilla striata; 



Leguminosa, 123; Labiata, 124; Ferula, 129; Erigeron, 



140 ; Leguminosa, 2 ; Sesleria dactyloides ; Aristida pollens ; 



Polygala alba ; Gnaphalium, 279 ; Vesicaria, 278 ; Verbena 



bracteosa ; Solanum triflorum ; Calliopsis bicolor ; (Enothera, 



647 ; Pentstemon, 662 ; Fwcca angustifolia ; Lippia cuneifolia, 



(Enothera, 178.) 



About two or three days' travelling from the latter place, 

 through wild and picturesque scenery in that range of the 

 Black Hills, we arrive at the red strata or Red Butts; 

 where we first meet the broken syenitic mountains. At the 

 foot of one of them I discovered a small tree, about 15-20 

 feet high, with the habit of Clethra alnifolia, but without 

 fruit or flowers, n. 195, (probably a sp. of Cratcegus). Here 

 also I found Heuchera, 118 ; Eriogonum ? 145 ; Purshia tri- 

 dentata ; Artemisia tridentata ; (for the first time,) A. cana, 

 commencing at Laramie River, Potentilla, 249; Scutellaria 

 parvula; Spiracea, 576 ; Eriogonum, 661. Hedyarum} 71* 

 On this narrow belt occur a great number of plants, the 



* Psoralea canescens ceases here, as well as its constant companion, 

 the useful Ps. esculenta, Pursh. The latter is the most abundant, 

 but becomes more and more thinly scattered towards the north, and 

 ceases on the lower Saint Peter River, at Traverse des Sioux. The same 

 locality is, on the contrary, the place where the Psoralea canescens is the 

 most abundant, which latter becomes more and more thinly scattered 

 south-westward, until at Fort Laramie, at least near it, it is very 

 rare, and disappears at last with P 8 . esculenta. Another very much allied 

 species, however, takes the place of the latter, but very sparingly, (pro- 

 bably Psoralea hypogxa, Nutt.,) after which, I noticed not another 

 species of this genus east of the Rocky Mountains. 



