638 



Rydberg: Phytogeographical notes 



belonging to the Staked Plains and the Upper Sonoran flora. 

 The species of Andropogon, Sporoholus, and Koeleria and the 

 stoloniferous species of Agropyron are immigrants from the Great 

 Plains, while those of Stipa (except S. comata) and most species 

 of Bromus are endemic. The species of Poa and the bunched 

 species of Agropyron are divided between the two categories. 

 The following belong here: 



The following also belong here but are restricted : 



Southern Rockies 

 Andropogon chrysocomus %Festuca Thurberi 



%Blephar incur on tricholepis ^Agropyron arizonicum 



Poa lucida 

 Bromus Porteri 



Stipa Richardsonii 



" Williamsii 



" Elmeri 

 Muhlenbergia sguarrosa 



§ " Bakeri 



Northern Rockies 



Calamagrostis mofitanensis 

 Poa nevadensis 

 Bromus breviaristatus 

 " Flodm(fnii 



