BOTANICAL INFORMATION. 39 



first and last time to the botanist ; though I am sure that 

 other botanists, not being obliged to pass through so hastily as 

 I was compelled to do, would, on the same route, find a great 

 number more. The following are a few of them : Phaca, 

 No. 1 ; Phaca ? 3 ; Erigeron, 27 ; Armaria, 36 ; Oxytropis, 

 39; Viola, 41 ; Cantua? 51; Gaura, 55; Homolobus, 56; 

 Stanley a pinnatifida ; Chenopodiacea, 64 ; Potentilla, 69 ; Erio- 

 gonum, 15 ; Silene, 49 ; Phaca, 106 ; Eriogonum, 139 ; Lygo- 

 desmia, 156; (Enothera, 175 and 176; Senecio, 202; (Crepis, 

 222) ? Orchis, 233 ; Siliquosa, 234 ; Phacelia, 243 ; (Astra- 

 galus, 256)? Lobelia? 263; Erigeron, 277; Populus, 281; 

 Bartonia, 368 ; and some others. Besides these, we stepped 

 out of broader zones ; first we leave Tradescantia Vir~ 

 ginica behind, more common in the Pawnee territory than in 

 Virginia or Canada ! Further, Fragaria and Fraxinus, of 

 which some small groves reappeared on Laramie River. In 

 a small stripe of land, on this route, prevails that brilliant 

 blue among the mass of flowers, occasioned by the great 

 masses of Delphinium azureum and the different blue Pent- 

 stemons. We also left the belts of (Enothera 16, Lygo- 

 desmia juncea, Lygodesmia 43, (Enothera albicaulis, Cyno- 

 glossum Nuttallii, Viola Nuttallii, Sida coccinea, Dodecatheon 

 integrifolium, Hippuris^ • Triglochin, Lepturus, Ceratochloa, 

 the almost prostrate Phaca, Purshia, Lathyrus ornatus, 

 Pentstemon pubescens, Draba Caroliniana (at Horse Creek, in 

 the plains), Glaux maritima, and a few others. Once again, 

 a three days' journey through syenitic and pseudo-basaltic 

 confused hills and mountains, we are at last out of this rich 

 group, and have arrived at Rock Independence. At the 

 crossing-place of the northern arm of Platte, the hills are 

 already about 1000 feet high, and showed at that time, (July 

 15th), snow in the high defiles. They are chiefly clad with 

 Abies Canadensis and Pinus resinosa, with some traces of the 

 Juniperus Andina. These mountains abound in springs, along 

 the margins of which collect Populus candicans and betuhe- 

 folia, with Crataegus lucida, and Negundo. Here I noticed 

 first the stately Frasera, 266, mentioned by Dr. Torrey in 

 Captain Fremont's report, growing between the poplar 



