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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, Mammillaria vivipara 
and Opuntia Missouriensis, 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 Rumex 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 Conifere, 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 Graminee are quite abundant and interesting, while 
Filices make but-a scanty display. 
Doubtless a careful examination of certain localities through the entire 
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. 
RANUNOULACES. 
1. Clematis verticillaris, DC. 
1874. July, August. Frenchman’s Creek to Rocky Mountains. 
2. Clematis ligusticifolia, Nutt. 
1874. July. Along Frenchman’s Creek. 
*3. Anemone alpina, L. 
.*4, Anemone nultifida, DC. 
*5. Anemone nemorvusa, L. 
*6. Anemone parviflora, Mx. 
7. Anemone patens, L., var. Nuttalliana, Gray. 
1873. July, August. Between Pembina and Mouse River. 
Apparently an autumual inflorescence, the buds and flowers 
appearing with tbe mature leaves. 
8. Anemone Pennsylvanica, L. 
1873. July. Pembina. Very abundant. 
1874. ‘July. Prairie near Milk River. 
*9. Thalictrum cornuti, 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 abortivus, L. 
