100 



Rydberg: Phytogeographical notes 



Northern and Southern Rockies 

 Bistorta linearifolia B. bistortoides , glacial 



Acomastylis turbinata A. Rossii, arctic 



Acomastylis sericea A. Rossii, arctic 



Mertensia nivalis M. lanceolata, glacial 



Castilleja occidentalis C. pallida, arctic 



Many of the alpine plants of the Rockies have their nearest 

 relatives among the subalpine or mountain plants of the region. 

 Such are 



Northern Rockies 



Alpine 



Potentilla perdissecta 

 Potentilla decurrens 

 Pseudocymopterus Tiedestromii 

 Biipleuram purpureum 



Phacelia alpina 



Subalpine 

 P. diversifolia 

 P. diversifolia 

 P. montanus 

 B. americanum (related to 



ranunculoides of Europe) 

 P. heterophylla 



B. 



Southern Rockies 

 Avena Mortoniana A. americana 



Poa Pattersonii P. crocata 



Eriogonum xanthum E. flavum 



Aquilegia saximontana A 



Thlaspi coloradense T 



Thlaspi purpurascens 



Cheirinia amoena 

 Cheirinia nivalis 

 Cheirinia radiata 

 A ragallus foliolosus 

 Primula angustifolia 

 Phlox condensata 

 *Mertensia Bakeri 

 * Mertensia lateriflora 

 *Mertensia Parryi 

 *Mertensia viridula 

 Besseya alpina 

 Achillea subalpina 



brevistyla 



glaucum (also closely related to 



T. alpestre of Europe) 

 T. glaucum (also closely related to 



T. alpestre of Europe) 

 C. Wheeleri 

 C. Wheeleri 

 C. asperrima 

 A. reflexus 

 P. Broadheadae 

 P. caespitosa 



M. lanceolata 



B. plantaginifolia 

 A. lanulosa 



t Those marked with braces constitute groups of closely related species. 



