326 



Rydberg: Phytogeographical notes 



sandhills in the so-called "Parks" of Colorado and in some of the 

 broader river valleys. Most of the species characteristic of both 

 are also found on the Great Plains and are such as have migrated 

 along the rivers to higher altitudes. The following species are 

 components of the flora. None of these are transcontinental or 

 common to the Rockies and the Canadian # Zone. A few are 

 common to the Rocky Mountains and the Sierra Nevada Region, 

 but most of them are endemics, either of the Great Plains or the 

 Great Basin, or both. 



Eriocoma hymenoides 

 Muhlenbergia pungens 

 Stipa speciosa 

 Oryzopsis Webberi 

 Sitanion elymoides 

 Arenaria confusa 

 Arenaria polycaulos 

 Peritoma. serrulatum 

 Epilobium paniculatum 



Gayophytum intermedium 

 Gayophytum ramosissimum 

 Gayophytum racemosum 

 Nuttallia midtiflora 

 Nuttallia densa 

 Nuttallia speciosa 

 Cryptantha Torreyana 

 Lithospermum mtdtiflorum 

 Helianthus petiolaris 



M. ROCK SLIDES 



The rock slide flora of the upper Montane Zone resembles that 

 of the Subalpine, which has already been described.* In lower 

 altitudes the following species appear, all of which are endemic to 

 the Southern Rockies except Viola biflora, which is found also in 

 Europe. 



Elymus ambiguus\ 

 Aquilegia saximonana\ 

 Aragallus Hallii\ 

 Limnobotrya montigena\ 

 Viola biflora^ 

 Pseudopteryxia anisata~\ 

 Pseudopteryxia aletijolia\ 



New York Botanical Garden. 



Polemonium confertum^ 

 Polemonium mellitumf 

 Polemonium Brandegei\ 

 Pentstemon stenosepalus\ 

 Senecio Fendleri\ 

 Senecio amplectens\ 

 Senecio canovirens\ 



* Bull. Torrey Club 44: 453. 1917. 



