98 RYDBERG: PHYTOGEOGRAPHICAL NOTES 
AMERICAN ENDEMIC ALPINE PLANTS 
More than one third of the alpine plants of the Rockies are 
endemic and if the subalpine element found just over the timber- 
line, or occasionally higher up, is included, this proportion is 
increased to about half of all the species. Several of these are 
apparently derived from circumpolar glacial or arctic plants. 
SOUTHERN ROCKIES 
Deschampsia alpicola 
Ranunculus Macauleyi 
Parrya platycarpa 
Leptasea chrysantha 
Muscaria delicatula 
Muscaria micropetala 
Saxtfraga debilis 
Saxifraga simulata 
Potentilla modesta 
NORTHERN ROCKIES 
Salix nivalis 
Draba lonchocarpa 
Muscaria monticola 
Micranthes Rydbergii 
Micranthes crenatifolia 
Spathularia Vreelandii 
Phyllodoce empetriformis 
Phyllodoce glanduliflora 
Cassiope Mertensiana 
SOUTHERN AND NORTHERN 
ROCKIES 
Micranthes rhomboidea 
Micranthes arnoglosa 
Taraxacum scopulorum 
Salix saximontana 
CIRCUMPOLAR GLACIAL OR ARCTIC 
D. caespitosa 
R. nivalis 
P. macrocarpa 
L. Hirculus 
M. caespitosa 
M. caespitosa 
S. rivularis 
S. cernua 
P. nivea (perhaps through P. 
quinquefolia) 
CIRCUMPOLAR GLACIAL OR ARCTIC 
S. reticulata 
D., nivalis 
M. caespitosa 
M. hieracifoha 
M. nivalis 
S. stellaris 
P. coerulea 
P. coerulea 
C. tetragona 
CIRCUMPOLAR GLACIAL OR ARCTIC 
M. nivalis 
M. nivalis 
T. arcticum 
S. reticulata 
Others have no close relative on this continent, but may have 
the same origin as some Old World plants. 
given with the nearest relatives abroad. 
A list of these is here : 
