have crept down from the hills. The wet valleys, especially arouud 

 the lakes, have a flora of their own, and it is in this flora that 

 there is the most localization of species. The species peculiar to 

 the sand hills and blow-outs and the prairie species of the dry 

 valleys are common to the entire region, from the point where we 

 entered the sand hills east of Alliance to the sand hills near Ne- 

 ligh in Antelope county. We also found the same sand hill 

 species — no more and no less — on a sandy bluff near Loretto in 

 Boone county. The species peculiar to the wet valleys change as 

 one passes from west to east, only two or three being found 

 throughout the region. A species is frequently confined to 

 isolated patches or widely separated lake-basins. 



The following species are to be found in every blow-out 

 throughout the region: Stipa comata, Oryzopsis cuspidata, 

 Eedfieldia flexuosa, Tradescantia virginica, Eriogonum annnuiii, 

 Oenothera serrulata, Prunus pumila, Lathyrus sp. (ornntusf), 

 Astragalus pictus var. fiUfoKus, Hymenopappus fllifolms. Not 

 only are these species in every blow-out, but they are on every hill. 

 Besides these, the most common sand hill inhabitants are : Andro- 

 pogon scoparius, A. liallii, Muhlenbergia pungens, Abroniafrag- 

 rans,Rosavirginiana Yar. arkansana, E. fendleri,Acerates viruU- 

 flora, Erigeron divergens, Haplopappus spinulosvs, Chrysopsis 

 villosa, and Laciniaria squarrosa var. intermedia. 



Few species are common to all the wet valleys or to all the wet 

 valleys of a particular locality. The most widely distributed are; 

 Sisyrinchiumangusiifolium,SaUx longifolia, GlycyrrMza hpidota 

 Amorpha fruticosa, Vtricularia vulgaris, Lobelia spirata, and 

 Rudbeckia hirta. 



The dry valley flora includes about the same species as the 

 prairie flora of Lancaster county. In addition there g,re Haplo- 

 pappus spinulosus and Cnicus undulatus. Primus deimssa was 

 found in a very peculiar dry valley in Sheridan county. It 



IS 



common on the banks of the North Loup and in wet valleys in 

 the lake region of eastern Cherry county. 



