THE BOTANY OF THE ROUTE. 39 



Geum Virginianum, Linn. 

 Geum strictum, Ait. 

 Geum triflorum, Pursh. 

 Sanguisorba annua, Nutt. 

 Cham^rhodos erecta. 



POTENTILLA NORVEGICA, LilHl. 



Potentilla paradoxa, Nutt. 



PoTENTiLLA Pennsylvanica, Linn. 



Potentilla Canadensis, Linn. 



Potentilla ansebina, Linn. 



Potentilla arguta, Pursh. 



Fragaria vesca, Linn. 



RUBUS STRIGOSUS, Miclix. 



RUBUS VILLOSUS, Ait. 



Rosa blanda. Ait. ; Fort Clark. Neb. 



Crat^gds coccinea ; Fort Union, Neb. 



Ammania latifolia, Linn. 



Oenothera biennis, Linn. 



(Enothera albicaulis, Nutt. 



ffiNOTHEBA CORONOPIFOLIA, Torr. & Gray. 



(Enothera c^spitosa, Nutt. 



(Enothera serrulata, Nutt. 



Gaura coccinea, Nutt. 



CiRC^A lutetiana, Linn. 



Menzelia (Bartonia) ornata, Torr. & Gray. 



Echinoctstis lobata, Torr. & Gray. 



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



Ribes rotundifolium, Michx. ■ 



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



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



Opuntia Missouriensis, DC. 



Heuchera Richardsonii, R. Br. 



Sanicula Marylandioa, Linn. 



Osmorrhiza longistylis, DC. 



Cymopterus glomeratus, DC. 



MusENiUM DiVARiCATUM, Nutt. (Plate IL) 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 HooJceri, Torr. & Gray, M. 

 HooTceri, Nutt. ined., and Nuttall's M. trachijspennum and M. angusti/oliimi appear to be all one 

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

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

 the vitta?, whether one or more in each interval, rarely affords valid characters; and Musenium 

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

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

 not all opposite, the uppermost being usually alternate. 



