CHICKERING ON PLANTS OF DAKOTA AND MONTANA. 815 



*290. XantJiium ecJiinatum, Murr. 

 291. Xanthium strwnarium, L. 



1874. August. Along Missouri aud Milk Elvers. 

 •""292. Seliopsis scahra, Dun. 

 293. Eeliopsis Iccvis, Pursh. 



1873. July, August. Pembina and westward. Abundant. 

 *294. Ecliinacea purpurea, Moench. 

 295. Ecliinacea angustifolia, DC. 



1873. August. Dry i)lains. 

 *296. Rudhecliia fulgida, Ait. 



297. BudbecMa Jiirta, L. 



1873. July. Pembina. Dry plains, as at the East. 



298. Budbedcia laciniata, L. 



1873. August. Mouse River Plain, in thickets. 



299. Lepachys colmnnaris, T. & G. 



1873. August. Mouse Eiver. Yery abundant on prairies. 

 '''300. Helianthus giganteus, L. 



301. Helianthus petiolar is, i^utt. 



1874. August. Dry prairie, near base of Eoeky Mountains. 

 *302. Eeliantlius rigidus, Desf. 



303. Bidens frondosa, L. 



1873. July. Pembina. 

 '•-304. Bidens BecMi, Torr. 

 *305. Bidens chrysanthemoides, Mx. 



306. Gaillardia aristata, Pursh. 



1873. August. Mouse Eiver Plain. 



1874. August. Prairies along Frenchman's Creek. 

 *307. Gaillardia pinnaiifida, Torr. 



308. Gaillardia pulchella, Foug. 



1874. July, August. Dry prairies along Frenchman's Creek. 



309. Coreopsis tinctoria, Nutt. 



1874. August. Along Frenchman's Creek. 



310. Hymenopappus luteus, Nutt. 



1874. July. Prairie near Missouri Eiver. 



311. Actinella Bicliardso7iii, Nutt. 



1874. July. Along Missouri Eiver. — August. Along Milk 

 Eiver. 

 *312. Actinella acaulis, Nutt. 



313. Selenium autumnale, L. 



1873. August. Mouse Eiver. Slightly pubescent. 



314. Achillea millefolium, L. 



1873. July. Pembina. 



1874. June. Fort Buford. 



315. Artemisia cana, Pursh. 



1874. July. Dry plains, Missouri Eiver. 



