450 ' RYDBERG: PHYTOGEOGRAPHICAL NOTES 
Salix chlorophylla 
Betula glandulosa 
Phyllodoce empetriformis 
Kalmia microphylla 
Distegia involucrata 
Northern Rockies 
Salix Barkleyi 
““ commutata 
“ Tweedyi 
* pseudomyrsinites 
chlorophylla 
Alnus sinuata 
4é 
Ledum glandulosum 
': tAzaliastrum albiflorum 
Phyllodoce glanduliflora 
ee empetriformis 
Andromeda polifolia 
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 eithet in the willow bogs proper or on wet 
mountain slopes. 
Salix Hookeriana Salix arbusculoides 
“ myrtillifolia . “ Seemannii 
“*  alaxensis ““ desertorum 
“ Barrettiana Ledum groenlandicum 
~ 
~ 
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 
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: 
Eriopiiryne angustifolium Rubus acaulis 
Chamissonis “_arcticus 
s alpinum ‘““ Chamaemorus 
Drosera rotundifolia Oxycoccus palustris 
sé 
longifolia 
Pinguicula vulgaris 
Thalictrum alpinum 
