BOTANY OF THE ROUTE. 43 



GEUM VIRGINIANUM, Linn. 

 GEUM STRICTUM, Ait. 

 GEUM TRIFLORUM, Pursh. 

 SANGUISORBA ANNUA, Nutt. 

 CHAJLERHODOS ERECTA. 



POTENTILLA NORVEGICA, Linn. 

 POTENTILLA PARADOXA, Nutt. 



POTENTILLA PENNSYLVANIA, 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. 

 CRAT^GUS COCCINEA; Fort Union, Neb. 

 AMMANIA LATIFOLIA, Linn. 

 (ENOTHERA BIENNIS, Linn. 



(ENOTHERA ALBICAULIS, Nutt. 



(ENOTHERA CORONOPIFOLIA. Torr. & Gray. 

 (ENOTHERA C^ESPITOSA, Nutt. 

 (ENOTHERA SERRULATA, Nutt. 

 GAURA COCCINEA, Nutt. 



ClRC^EA LUTETIANA, Linn. 



MENTZELIA (BARTONIA) ORNATA, Torr. & Gray. 



ECHINOCYSTIS LOBATA, Torr. & Gray. 



RIBES HIRTELLUM, Michx.; fifty miles above Fort Union, Neb. 



RlBES ROTUNDIFOLIUM, Michx. 



RIBES FLORIDUM, L Her.; near Fort Union, Neb. 



RIBES AUREtfM, Pursh. ; one hundred miles above Fort Pierre, Neb. 



OPUNTIA MISSOURIENSIS, DC. 



HEUCHERA RICHARDSONII, R. Br. 



SANICULA MARYLANDICA, Linn. 



OSMORRHIZA LONGISTYLIS, DC. 



CYMOPTERUS GLOMERATUS, DC. 



MUSENIUM DIVARICATUM, Nutt. (Plate II.) 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. 

 Hookeri, Nutt. ined. , and NuttalPs J\L tracJtyspermum and M. angustifolium 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 vittffi, whether one or more in each interval, rarely affords valid characters; and Musenium 

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

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

 not all opposite, the uppermost being usually alternate. 



