THE BOTANY OF THE ROUTE. 
37 
Nasturtium palustre, DC. 
Nasturtium obtusum, Nutt. 
Nasturtium limosum, Nutt. 
Arabis hirsuta, Scop. 
Sisymbrium canescens, Nutt. A nearly glabrous variety. 
Erysimum cheiranthoides, Linn. 
Erysimum asperum, DC. 
Stanlbya integripolia, James. Without much doubt this is a mere state of 8. pinnatifida. 
Stanleya pinnatifida, Nutt. 
SiNAPis NIGRA, Linn. (Litroduced.) 
Capsblla bursa-pastoris, DC. 
Lepidium Virginicum, Linn. 
Lepidium intermedium, Gray, PI. Wright. 
Draba micrantha, Nutt. 
Cleome integripolia, Torr. & Gray. 
Viola cucullata. Ait. 
Viola palmata, Linn. 
Viola Canadensis, Linn. 
Elodea Virginiga, Nutt. 
McEHRiNGiA lateriflora, Feuzl. 
Cerastium arvensb. Linn. 
Cerastium mutans, Raf. 
Malvastrum coccineum. Gray, One hundred miles above Port Pierre. 
Linum perenne, Linn. 
Linum rigidum, Pursh. 
Geranium maculatum, Linn. 
OxALis viOLACEA, Linn. 
OXALIS CORNICULATA, Linn. 
Zanthoxylum Americanum, Mill. 
Rhus toxicodendron, Linn. 
Rhus aromatica, Ait. White river, Nebraska. 
Ampelopsis quinqubfolia, Michx. 
Ceanothus ovalis, Bigel., var. 
Staphtlea trifolia, Linn. 
Nbgundo aceroides, Moench. 
Polygala alba, Nutt. 
ViciA Americana, Muhl. 
Lathyrus linearis, Nutt. 
Lathyrus polymorphus, Nutt. 
Lathyrus venosus, Muhl. 
Amphicarpa monoica, Ell. 
Glycirrhiza lepidota, Nutt. 
PSORALEA LANCEOLATA, Pursh. 
Psoralea argophylla, Pursh, and var. decumbens. Less silvery and silky-hirsute; stems 
slender, decumbent or diffuse; stipules mostly near equalling the short petiole; leaflets ellip- 
