Rydberg: Phytogeographical notes 471 



Achillea subalpina Pseudocymopterus purpureas 



Arnica Parryi *Mertensia alpina 



*Senecio amplectens Mertensia brevistyla 



Oreochrysum Parryi Aster alpinus 



Northern 



Tofieldia palustris Acomastylis sericea 



Juncoides arcticum *Trifolium Haydeni 



Juncoides arcuatum Phacelia alpina 



Juncoides hyperboreum Angelica Roseana 



Juncus biglumis Polemonium viscosum 

 Drymocallis pseudorupestris Valeriana septentrionalis 



6. Alpine bogs 

 The principal hydrophytic formation of the alpine regions are 

 the alpine bogs or wet meadows, situated on the mountain sides 

 where the drainage is imperfect or where the water supply is 

 greatly increased by melting snowdrifts above. These are of two 

 kinds, either sedge bogs, where grasses and sedges are predomi- 

 nant, or willow bogs where the principal species are shrubs. The 

 latter are rare above timber-line in the southern Rockies. 



Sedge bogs 



Little needs to be said of the sedge bogs, as they resemble 

 similar bogs in any part of the colder regions, only that the indi- 

 vidual species vary. With the sedges are usually mixed in a con- 

 siderable amount of grasses as Alopecurus aristidatus , Calamagrostis 

 Langsdorfii, Poa leptocoma and Poa reflexa, the cotton grass, Erio- 

 phorum gracile, and other more conspicuous plants as the little 

 red elephant, Elephantella groenlandica. 



The principal plants of this formation are : 



Carex (many species) Calamagrostis Langsdorfii 



*Eriophorum gracile Poa leptocoma 



*Eriophorum polystachyum *Poa reflexa 



*Alopecurus aristidatus *Phleum alpinum 



* These are found only near the timber-line, otherwise belonging to the subalpine 

 region. 



