RYDBERG: PHYTOGEOGRAPHICAL NOTES 347 
larger percentage are arctic-alpine, descending into the Subalpine 
as Among these plants there are no trees and only a few low 
shrubs. 
Shrubs 
{Salix pseudomyrsinites Chiogenes hispidula 
Ribes hudsonianum Vaccinium uliginosum 
Andromeda polifolia 
Herbs 
Eriophorum Chamissonis tRanunculus hyperboreus 
tScirpus pauciflorus Drosera rotundifolia 
t “ — caespitosus Parnassia palustris 
tCarex capitata + (3 =. KRoteebust 
“ aenea + Saxifraga rivularis 
‘“ Heleonastes Anthiphylla oppositifolia 
 * Supina Comarum palustre 
“ deflexa Mertensia paniculata 
“ Hassei Veronica scutellata 
“ livida tPinguicula vulgaris 
“ vaginata Valeriana septentrionalis 
“ atratiformis Erigeron alpinus 
“miliaris ‘«  -ynalaschkensis 
‘ scirpoidea ‘ purpureum 
tJuncoides hyperboreum Senecio pauctflorus 
Cypripedium passerinum 
3. TRANSCONTINENTAL SPECIES LIMITED TO THE CANADIAN 
ROCKIES 
Some of the transcontinental subarctic plants have not spread 
at all south in the mountains and are found in the Rockies only at 
an altitude where the Subarctic Zone covers the lowlands. In other 
words, they are found only in the Canadian Rockies. These 
plants are also found north of the arctic timberline. They are: 
Shrubs 
+Cassiope tetragona 
+ Vaccinum Vitis-[daea 
tOxycoccus Oxycoccus 
tRubus acaulis 
¥ “ — Chamaemorus 
tLedum groenlandicum 
