﻿Rydberg: Phytogeographical notes 



part a number of species from the Montane Zone are added. 

 Along the water courses perhaps the most common grass in the 

 upper part is Deschampsia caespitosa. Where the soil is richer 

 the predominant grasses are Phleum alpinum, Agrostis variabilis, 

 Trisetum subspicatum, T. majus and several species of Poa. In 

 the lower part these, except the poas, are more or less replaced 

 by Alopecurus aristulatus, Muhlenbergia comata, Agrostis asperi- 

 folia, Graphephorum muticum, and Danthonia californica. Among 

 bushes, especially along the streams, the most common grasses 

 are Calamagrostis canadensis, C. Langsdorfii, Panicularia nervata, 

 and P. pauciflora. In the Northern Rockies many wet meadows 

 are made up wholly of Alopecurus occidentalis, but this species is 

 rare in the Southern Rockies. 



The following grasses are found in the Subalpine Zone through- 

 out the whole Rocky Mountain region : 



*Muhlenbergia racemosa 



*Phleum pratensi 



alpin 



* Alopecurus aristulatus 



" occidentalis 



* Agrostis asperifolia 



" hyemalis 

 variabilis 

 Calamagrostis Langsdorfii 

 " canadensis 



* Deschampsia atropurpurea 



The following are restricted 



Southern Rockies 

 Muhlenbergia Wolfii 



* Agrostis canina 

 ^Deschampsia alpicola 



Graphephorum Wolfii 



Trisetum subspicatum 

 majus 

 "^Graphephorum muticun 

 *Danthonia californica 

 * " intermedia 



Poa pratensis 

 reflexa 

 leptocoma 



alpina 



Olneyi 



Vaseyana 

 *Panicularia nervata 



" pauciflora 



*Hordeum jubatum 

 ) one of the two divisions: 



Agrostis variabilis 



Poa callichroa 



" occidentalis 

 * " tricholepis 

 Northern Rockies 



Poa nervosa 



