SCIENTIFIC EXPEDITION TO NORTHEASTERN COLORADO 1 63 



Woody plants 0} river bottoms and moist gulches: 



Salix amygdaloides Anders. 



Salix exigua Nutt. 



Populus angustijolia James 



Populus sargentii Dode=P. occtdentalis (Rydb.) Britt. 



Alnus tenuifolia Nutt. 



Betula fontinalis Sarg. 



Clematis ligusticijolia Nutt. 



Ribes vallicola Greene 



Rhus rydbergii Small 



Acer negundo Linn. 



Parthenocissus vitacea Hitch. 



Vitis vulpina Linn. 

 Woody plants of dry hills and bluffs: 



Pinus flexilis James ? (collected without cones) 



Juniperus scopulorum Sarg. 



Ribes cereum Dougl. 



Cercocarpus parvif alius Nutt. 



Rhus trilobata Nutt. 



The collection of plants made at Pawnee Buttes is of interest because 

 it represents the flora of the driest part of the high plains. Nothing 

 seems to have been published thus far concerning the plants of the 

 district. On this account a list of the specimens collected is given in 

 full, so far as determinations have been made. 



List of plants collected about eight miles west of Pawnee Buttes:^ 

 Pinus flexths James 

 Juniperus scopulorum Sarg. 

 Tradescantia scopulorum Rose 

 Agropyron sp. 



Bulbilis dactyloides (Nutt.) Raf. 

 Eriocoma cuspidata Nutt. 

 Kceleria cristata (Linn.) Pers. 

 Stipa spar tea Trin. 

 Zygadenus falcatus Rydb. 

 Eriogonum alatum Torr. 

 Ertogonum effusum Nutt. 

 Atriplex sp. 

 Eurotia lanata (Pursh) Moq. 



' Determinations in most cases were made by Professor Aven Nelson of the University of Wyoming. 



