450 RYDBERG: PHYTOGEOGRAPHICAL NOTES 
Salix chlorophylla Kalmia microphylla 
Betula glandulosa Distegia involucrata 
Phyllodoce empetriformis 
Northern Rockies 
Salix Barkleyt Ledum glandulosum 
“  commutata tAzaliastrum albiflorum 
‘Tweedy Phyllodoce glanduliflora 
‘  pseudomyrsinites ~ empetriformis 
‘*  chlorophylla Andromeda polifolia 
Alnus sinuata Vaccinium uliginosum 
In the Canadian Rockies quite a number of subarctic willows 
and other shrubs are added to this flora. These species, which 
are listed below, grow either in the willow bogs proper or on wet 
mountain slopes. 
Salix Hookeriana Salix arbusculoides 
“ myrtillifolia ‘«  Seemannit 
““  alaxensis ‘*  desertorum 
‘“ Barrettiana Ledum groenlandicum 
a 
Drummondiana  - Vaccinium Vitis-Idaea 
3. SPHAGNUM BOGS 
Sphagnum bogs are exceedingly rare in the Southern Rockies 
and of very limited extent. The phanerogamic flora, if any, is .. 
not different from that of the other bogs. In the northern part 4 
of the Northern Rockies, especially in Canada, they are more — | 
common. Here, as well as in the northern parts of Montana and — 
Idaho, there are found several phanerogams characteristic of the 
Hudsonian Zone of the northeast. Among these may be men-— 
tioned: 
ida pha angustifolium Rubus acaulis 
Chamissonis sin ECS 
ey alpinum ‘*  Chamaemorus 
Drosera rotundifolia Oxycoccus palustris 
“longifolia Pinguicula vulgaris 
Thalictrum alpinum 
