304 RYDBERG: PHYTOGEOGRAPHICAL NOTES 
c. Cliff plant 
Antiphylla oppositifolia (Eur.)+ 
Of these species Oryzopsis pungens, Carex Peckii, Osmorrhiza 
divaricata and Juncus Richardsonianus have extended their range 
into the Black Hills of South Dakota, and Osmorrhiza divaricata 
and Youngia nana into the Uintah Mountains of Utah. 
2. SPECIES REACHING THE MAIN RANGE IN MONTANA OR THE 
BITTER-ROOTS IN IDAHO, BUT NOT FURTHER SOUTH 
a. Forest plants 
Actaea rubra Lycopodium obscurum (Eur.) 
Ribes Hudsonianum Lycopodium complanatum (Eur.) 
Dryopteris Filix-mas (Eur.) Lycopodium clavatum (Eur.) 
Dryopteris dilatata (Eur.) Lycopodium sitchense 
b. Water and bog plants 
Shrubs 
Salix pedicellaris Salix candida 
Herbs 
Rynchospora alba (Eur.) Castalia Leibergii 
Scirpus subterminalis Drosera rotundifolia (Eur.) 
Scirpus atrocinctus Drosera longifolia (Eur.) 
Carex vaginata (Eur.) Geum macrophyllum 
Carex limosa (Eur.) Mertensia paniculata 
Carex scirpoidea (Eur.) Equisetum sylvaticum (Eur.) 
Carex lacustris (Eur.) Equisetum scirpoides (Eur.) 
Carex Crawfordii Lycopodium inundatum (Eur.) 
Carex flava (Eur.) 
Pellaea glabella, growing among exposed rocks, has a peculiar 
distribution. Though it is not found in the Southern Rockies it 
is found in the Black Hills and the hilly country of western Ne- 
braska and reappears in eastern Kansas. 
