Rydberg: Phytogeographical notes 



355 



from Alberta and Montana, all specimens referred to these and 

 seen by me have turned out to belong to Picea albertiana. Picea 

 Engelmannii and Abies lasiocarpa may be regarded as endemic 

 Rocky Mountain species, which have emigrated into the Cascades. 

 In the Northern Rockies there could be added to these Larix 

 Lyallii, which has also emigrated into the northern part of the 

 Cascades. In the very lowest part of the Subalpine Zone there are 

 sometimes found intermixed trees of Pseudotsuga mucronata 

 belonging really to the Montane Zone. It has about the same dis- 

 tribution in the Rockies as the spruce and fir mentioned above, 

 but is also equally common though in the Pacific province and 

 extends south into the Sierra Madre of Mexico. It is hard to tell 

 if its original home was in the Rockies or on the Pacific coast. 



The two species, Picea Engelmannii and Abies lasiocarpa, are 

 not restricted to the Subalpine Zone, however, for both run down 

 into the Montane Zone on northern slopes and along streams. 

 The element of the Rocky Mountain flora, which has the same 

 distribution as these, is, as stated before, not large and it contains 

 no other woody plants. 



Trees 

 Picea Engelmannii Abies lasiocarpa 



Herbs 



Trisetum majics 

 Poa reflexa 

 " leptocoma 

 ' ' Paddensis 

 " nevadensis 

 t " rupicola 

 \Festiica saximontana 

 Carex Engelmannii 

 " pyrenaica* 

 ' ' petasata 

 ' ' Geyeri 

 Juncus balticus montanus 

 Ophrys nephrophylla 

 Trolliiis alhiflorus 

 Cardamine acuminata 



Arabis rupestris 

 " Drummondii 



Lithophragma bulbifera 



Ozomelis staiiropetala 



Leptasea aiistromontana 

 \Sieversia ciliata 



Epilobium Drummondii 

 '\Phlox caespitosa 



Macronema grindelifolium 



Aster apricus 



Anaphalis subalpina 



Antennaria umbrinella 

 " anaphaloides 



Arnica Parryi 

 ' ' Rydbergii 



* Also in Europe and Asia. 



