802 BULLETIN UNITED STATES GEOLOGICAL SURVEY. 



The species common to this region and the East show, for the most 

 part, the effect of the drier climate and the scorching sun of the plains 

 in smaller, thicker, more hirsute leaves. 



Among the Cactacece but two species are found, 2fammillaria vivipara 

 and Opuntia Missotiriensis, quite abundant along the central region, from 

 103° to 111° west longitude, limited very abruptly by increasing moist- 

 ure of soil and climate. 



Salicornia herbacea and Btimex maritimus suggest the saline character 

 of the soil, and flourish as luxuriantly as if the sea still washed those 

 inland shores. 



The paucity in species of trees, excepting Coniferw, is in striking 

 contrast to the variety of the East, and may in part arise from the 

 fact that so many trees are out of flower before the beginning of June. 



The Orchidacece would naturally be poorly represented. 



Carices and Graminece are quite abundant and interesting, while 

 Filices make but a scanty display. 



Doubtless a careful examination of certain localities through the enti? e 

 season would add many species to the list, but the present catalogue 

 serves very well to convey to the botanist a good idea of the character- 

 istic flora of the 49th parallel. 



EANUI^OULACE^. 



1. Clematis vcrticlllaris, DO. 



1874. July, August. Frenchman's Creek to Rocky Mountains. 



2. Clematis UgitstiGifoUa, Nutt. 



1874, July. Along Frenchman's Creek. 

 *3. Anemone alpina, L. 

 *4. Anemone multifida, DO. 

 *o. Anemone nemorosa, L. 

 *6. Anemone ])arviflora, Mx. 



7. Anemone patens^ L., var, Mittalliana, Gray, 



1873. July, August. Between Pembina and Mouse Eiver. 

 Apparently an autumnal inflorescence, the buds and flowers 

 appearing with the mature leaves. 



8. Anemone Pennsylvanica^ L. 



1873. July. Pembina. Very abundant. 



1874. July. Prairie near Milk liiver. 

 *9. Thalictrum coniuti, L. 



10. Thalictrum dioicum, L. 



1873. July. Pembina. Very common, on the prairie. 



11. Thalictrum purpurascens, L. 



1873. July, August. Pembina and along Mouse River. 

 *12. Ranunculus ahoriivus, L. 



