634 Rydberg: Phytogeographical notes 



The following species growing in both the Northern and Southern 

 Rockies belong here: 



Calamagrostis piirpiirascens Festuca curtijolia 



\Poa rupicola " saximontana 



crocata "fAgropyron Scribneri 



t " P alter sonii f " andinum 



' epilis 

 ' paddensis 

 ' longiligula 



The following belong here also, but are restricted to but one 

 region : 



Southern Rockies Northern Rockies 



Muhlenbergia suhalpina Poa confusa 



" filiculmis " Cusickii 



Festuca miniitiflora Sitanion rigidum 



B. MONTANE ZONE 



The grasslands of the Montane Zone resemble more those of 

 the Great Plains and the Foothills. In the large open valleys or 

 so-called parks, many of the grasses are the same as those found 

 in the valleys of the plain region, in fact many have followed the 

 streams up from the prairies. The grass flora of the bottoms of 

 the canyons and of the river banks is also much the same as 

 further down in the plain region. The flora of the elevated 

 ridges and "hog-backs" also is more or less a cpntinuation of that 

 of the plains, with the addition of some endemic grasses. The 

 grass flora of the mountain slopes consists more exclusively of 

 grasses peculiar to the mountain regions. 



Species in the following lists marked with an asterisk (*) are 

 common to the Great Plains; those marked with a dagger (f), to 

 the Subalpine Zone. Species marked with a double dagger (|) 

 are northern species found at low altitudes throughout the boreal 

 regions but not on the Great Plains or the Prairies; in the Rocky 

 Mountains they are restricted to the Montane and Subalpine 

 Zones. Species marked with a section (-§) occur also on the 

 Staked Plains and in the Upper Sonoran region. 



