BOTANY OF THE ROUTE. 



43 



Geum ViRGiNiANUii, Linn. 

 Geum strictum, Ait. 

 Geum triflor'jm, Pursh. 

 Sanguisorba annua, Nutt. 

 Cham^rhodos erecta. 

 Potentilla Norvegica, Linn. 



POTENTILLA PARADOXA, Nutt. 



POTENTILLA Pennsyltanica, Linn. 



POTENTILLA CANADENSIS, Linn. 

 POTENTILLA ANSERINA, Linn. 

 POTENTILLA ARGUTA, Pursh. 



Fragaria VESCA, Linn. 

 RuBus STRiGOSUS, Michx. 



RUBUS VILLOSUS, Ait. 



Rosa blanda, Ait. ; Fort Clark, Neb. 

 Crataegus coccinea; Fort Union, Neb. 

 Ammania latifolia, Linn. 

 OENOTHERA BIENNIS, Linn. 



OilNOTHERA ALBICAULIS, Nutt. 



GSnothera coronopifolia. Torr. & Gray. 



OENOTHERA CESPITOSA, Nutt. 

 ffiNOTIIERA SERRULATA, Nutt. 

 GaURA COCCINEA, Nutt. 

 CiRCiEA LUTETIANA, Linn. 



Mentzelia (Bartonia) ornata, Torr. & Gray. 



EcHiNOCYSTis lobata, Torr. & Gray. 



RiBES hirtellum, Michx.; fifty miles above Fort Union, Neb. 



RiBES ROTUNDIFOLIUM, MicllX. 



RiBES floridum, L'Her.; near Fort Union, Neb. 



RiBES AUREUM, Pursli. ; one hundred miles above Fort Pierre, Neb. 



Opuntia Missouriensis, DC. 



Heuchera Richardsonii, R. Br. 



Sanicula Mary'landica, Linn. 



Osmorrhiza longistylis, DC. 



Cymopterus glomeratus, DC. 



MusENiUii DiVARiCATUM, Nutt. (Plate 11.) The specimens in this collection, from various 

 localities, all have smooth ovaries and fruit, and therefore belong to the typical form of the 

 species. We give a figure to illustrate the plant. The variety Hookeri, Torr. & Gray, M. 

 Hooker i, Nutt. ined., and Nuttall's 31. trachyspermum and M. arujnstifolium appear to be all one 

 species, having shorter as well as scabrous fruit, and probably distinct from 31. divaricatum; 

 but my present means of comparison do not suffice for determining this point. The number of 

 the vitt;i3, whether one or more in each interval, rarely affords valid characters; and 3Iusenium 

 will probably be merged in TauscUa; but this question should perhaps be deferred to a general 

 recension ot unbelliferous genera, which is greatly needed. The leaves of 31. divaricatum are 

 not all opposite, the uppermost being usually alternate. 



