— a 
. 
315. 
CHICKERING ON PLANTS OF DAKOTA AND MONTANA. 815 
Xanthium echinatum, Murr. 
Xanthium strumarium, L. 
1874. Augnst. Along Missouri and Milk Rivers. 
. Heliopsis scabra, Dun. 
. Heliopsis levis, Pursh. 
1873. July, August. Pembina and westward. Abundant. 
. Hchinacea purpurea, Moench. 
. Hehinacea angustifolia, DC. 
1873. August. Dry plains. 
. Rudbeckia fulgida, Ait. 
. Rudbeckia hirta, L. 
1873. July. Pembina. Dry plains, as at the East. 
. Rudbeckia laciniata, L. 
1873. August. Mouse River Plain, in thickets. 
. Lepachys columnaris, T. & G. 
1873. August. Mouse River. Very abundant on prairies. 
. Helianthus giganteus, L. 
. Helianthus petiolaris, Nutt. 
1874. August. Dry prairie, near base of Rocky Mountains. 
. Helianthus rigidus, Desf. 
. Bidens frondosa, L. 
1875. July. Pembina. 
. Bidens Beckii, Torr. 
. Bidens chrysanthemoides, Mx. 
. Gaillardia aristata, Pursh. 
1873. August. Mouse River Plain. 
1874. August. Prairies along Frenchman’s Creek. 
. Gaillardia pinnatifida, Torr. 
. Gaillardia pulchella, Foug. 
1874. July, August. Dry prairies along Frenchman’s Creek. 
. Coreopsis tinctoria, Nutt. 
1874. August. Along Frenchman’s Creek. 
. Hymenopappus luteus, Nutt. 
1874. July. Prairie near Missouri River. 
. Actinella Richardsonii, Nutt. 
1874. July. Along Missouri River.—August. Along Milk 
River, 
. Actinella acaulis, Nutt. 
. Helenium autumnale, L. 
1873. August. Mouse River. Slightiy pubescent. 
. Achillea millefolium, L. 
1873. July. Pembina. 
1874. June. Fort Buford. 
Artemisia cana, Pursh. 
1874. July. Dry plains, Missouri River. 
