464 RYDBERG: PHYTOGEOGRAPHICAL NOTES 
tPoa Patterson *Draba streptocarpa 
Poa Lettermannt Draba saximontana 
Avena Mortoniana Androsace carinata 
*Eriogonum xanthum *Dasystephana Parrys 
Paronychia pulvinata Phlox condensata 
*Arenaria Fendlert Castilleja Haydent 
Thlaspi coloradense Pentstemon Hallit 
Thlaspi purpurascens tEritrichium argenteum 
Cheirinia radiata Erigeron pinnatisectus 
Cheirinia nivalis *Besseya plantaginea 
Draba aureiformis *Senecio Nelsonit 
Draba chrysantha Senecio Harbourit 
Draba crassifolia 
The following are important plants of this formation in che 
northern Rockies but lacking in the southern: 
Festuca supina Douglasia montana 
Agropyron andinum Phacelia sericea 
Agropyron latiglume Phacelia alpina 
Potentilla Macounti Eritrichium elongatum 
Dryas Drummondii Dasystephana monticola 
Aquilegia Jonesti 
The following plants belong to this formation but are rather 
local: 
Southern 
Poa epilis Potentilla minutifolia 
Festuca minutiflora Potentilla tenerrima 
Arenaria Tweed yi Potentilla nivea ° 
Cheirinia amoena Potentilla nipharga 
Draba crassa Potentilla paucijuga 
Parrya platycarpa Gormania debilis 
Oreoxis humilis Aragallus podocar pus 
Oreoxis Bakeri Aragallus Halli 
Oreoxis alpina Chaenactis pedicularia 
Pseudocymopterus Tidestromii  Chaenactis alpina 
X ylorrhiza coloradensis Senecio petrocallis 
X ylorrhiza Brandegei Chrysopsis alpicola 
Macronema pygmeum 
