10 AMERICAN FERN JOURNAL 
The fern flora of this region is scanty. The following 
species have been collected: Cheilanthes feei, in cafions; 
Woodsia oregana, on buttes; Marsilea vestita, in ponds; 
and Selaginella rupestris, on exposed dry situations, 
often forming dense mats on high hills and buttes. 
Pint Ripcre REGION 
Pine Ridge is a northerly facing escarpment extending 
from Wyoming into Nebraska near the northwest corner 
and in the middle part of Sioux county and extending 
eastward across Sioux, Dawes, Sheridan and Cherry 
counties, approximately parallel with the northern 
boundary of the state. The ridge varies from a mile to 
‘several miles in width and has its greatest development 
in Nebraska in Sioux and Dawes counties. Eastward 
it becomes lower and narrower. The ridge is much 
broken by deeply cut cafions crossing transversely to 
the general trend. Along this ridge upon the cafion 
sides is a development of the western yellow pine (Pinus 
ponderosa scopulorum). The vegetation peculiar to 
Pine Ridge extends farther eastward across Brown, 
Rock and Keya Paha counties. Pine Ridge is essentially 
a variation of the wooded bluffs region. 
In favorable, usually moist situations are found 
Botrychium virginianum, Athyrium filiz-foemina (rarely) 
Cystopteris fragilis, Dryopteris spinulosa, Dryopteris 
thelypteris, Woodsia oregana, and Equisetum laevigatum. 
Bap Lanps REGION 
The Bad Lands in Nebraska are confined largely to 
Sioux and Dawes counties, in the northwestern part of 
the state, with occasional outliers in the foothill region 
south of the North Platte river in Scottsbluff county- 
The region is a rugged, submontane one, marked with 
deep cafions, mostly drained by Hat creek and White 
river and their tributaries. The larger part of the region 
