RYDBERG: PHYTOGEOGRAPHICAL NOTES A467 
Montana, with a good deal of moisture, sometimes whole acres 
are covered with Cassiope Mertensiana. Except the ericaceous 
bog formation, made up of Phyllodoce, Kalmia, and Ledum, this is 
the only poor representation of the shrubby ericaceous formation, 
so characteristic of the Alps. This association of Cassiope sug- 
gests in many respects the arctic tundra. I have not visited the 
extreme northern part of the Rockies in British America, but ] 
suspect that Cassiope tetragona and Harrimanella hypnoides there 
form similar associations. The only other plants in the alpine 
regions of the Rockies that I know of as forming similar mats are the 
dwarf alpine willows, Salix saximontana, S. nivalis, S. petrophila, 
S cascadensis, and S. Dodgeana. The last, the smallest willow 
of the world, I found forming similar mats near the top of Electric 
Peak, southern Montana, at an altitude of 11,000 feet. When it 
was first discovered I did not know that I had been walking on 
top of a willow forest before I dropped down on my knees, 
began to poke among the leaves, and found some minute catkins. 
The following plants are common in the seep throughout the 
Rockies: 
Juncoides spicatum 
Salix petrophila 
Salix saximontana 
Oxyria digyna 
Alsinopsis propinqua 
Alsine baicalensis 
Alsine laeta 
Muscaria adscendens 
Micranthes rhomboidea 
Leptasea flagellaris 
Sibbaldia procumbens 
Trifolium Brandegei 
Trifolium Parryi 
*Vaccinium caespitosum 
Primula angustifolia 
Polemonium pulcherrimum 
Sagina saginoides 
Ranunculus pygmaeus 
Ranunculus hyperboreus 
*A quilegia coerulea 
Draba fladnizensis 
Rhodiola integrifolia 
Saxifraga cernua 
Cerastium behringianum 
Mertensia alpina 
Myosotis alpestris 
Taraxacum scopulorum 
Artemisia scopulorum 
Senecio cymbalarioides 
Juncus Drummondit 
Juncus Parryt 
Juncus triglumis 
Juncus castaneus 
Chondrophylla americana 
