32 



Along the brooks in the wider canons is a dense growth of wil- 

 low, mostly Salix nigra. Lepargyraea argeniea is often seen 

 along the upper edges of the draws further out in the valley. 

 Everywhere in the canons is the smooth gooseberry, Rihes oxy- 

 canthoides, which has very large and fine fruit. E. cereum, E. 

 floridum, and E. aureum are also quite common. Along the up- 

 per parts of the canons, and in open places, Ehus canadensis 

 var. trilohata grows in dense patches, and everywhere, on high 

 and low ground, in shade and in sun, in dry and in damp places, 

 is Ehus radicans. For some reason, perhaps on account of its 

 firmer leaves, it does not appear to be as poisonous as the ivy 

 found in the eastern part of the state. Prunus demissa and 

 Amelanchier alnifolia a.ce common on the sides of the canons. 

 Along the sides of the buttes and well up the sides of the 

 canons is the little Sijmphoricarpos racemosus var. pauciflorus, 

 and extending down into the canons is the larger S. occidentalis. 



Among the most conspicuous of the herbaceous plants on the 

 sides and tops of the buttes and canons are Pentstemon glaber, 

 P. gracilis, Campanula rotundifolia, Calochortus nuttallii and C. 

 gunnisonii, and Zygadenus elegans. All of these extend well 

 down into the canons. Phacelia circinata and Gilia iberidifolia 

 are confined to the upper edges of the canons and sides of the 

 buttes. Here are found a large number of prairie species, ex- 

 tending down into the valley, or so-called bad land region. 

 Down in the damper portions of the canons, among many others, 

 are Habenaria hyperborea, H. bracteata, Coralorrhiza muUi- 

 flora and C. striata, and Spiranthes romanzoffiana. Pterospora 

 andromedea is common in the narrower canons, under the pines. 



LIST OP PLANTS COLLECTED. 



(Species designated by a * not previously reported.) 



Eiipatorium ptirpureum Ij. Squaw canon. (352) 



Chrysopsis villosa Nutt. var. hispida Gray. Squaw butte. (346) 



Haplopappus nuttallii Torr. & Gray. Squaw butte. (347) 



