THE PERENNIAL SCAPOSE DRABAS OF NORTH AMERICA 26 1 
9. Draba incerta Pay son n. sp. 
Somewhat cespitose perennial, caudex branching: leaves linear or 
linear-spatulate, 7-10 mm. long, about 2 mm. wide, not rigid, midvein 
obscure, greyish with long stellate pubescence and weak marginal 
cilia: sepals villous; petals yellow, twice as long as the sepals: fruiting 
inflorescence elongated: pods numerous (6-14), flattened, simply 
pubescent, broadly lanceolate, 4-6 mm. long: style evident, less than 
I mm. long: seeds neither winged nor margined. 
Draba incerta ia a rather unsatisfactory species appearing almost 
as if it were produced by peculiar ecological conditions. It differs so 
strikingly in leaf characters from its nearest relative (D, oligosperma) , 
however, that one could scarcely consider them identical. I find that 
Dr. Gilg has evidently considered this as a distinct species, although 
he has included more than one species under the manuscript name 
which he gave it. It may be distinguished from D, oligosperma by 
the thinner leaves which are not at all rigid and by the absence of the 
prominent midrib which characterizes that species. The pubescence 
too is longer and more diffuse. 
Specimens Examined. — ^Alberta: Tunnel Mt., Banff, May 9, 
1902, iV. B. Sanson; Sulphur Mt., Banff, June 16, 1901, L. R. Waldron. 
Washington: Yakima Region, 1882, Brandegee, no. 371. Wyoming: 
among rocks on the summit, the Thunderer, Yellowstone Park, July 
13, 1899, ^. Nelson &' E. Nelson, no. 5818 (type in Ry. Mt. Herbarium) ; 
Mt. Washburn, Yellowstone Park, Aug. 1885, Tweedy, no. 566. 
10. D. Bellii Holm, Repert. Nov. Sp. Fedde 3: 338. 1907. 
I have seen one specimen of this species and that is from ''crevices 
of rocks," Mansfield Island, Hudson Bay, Aug. 30, 1884, Dr. R. Bell. 
11. Draba vestita Payson n. sp. 
Very densely cespitose perennial; caudex much branched; leaves 
persistent and densely clothing the branches of the caudex; 5-7 mm. 
long, I mm. or more wide, broadly linear, thin and not at all rigid, 
midvein evident; pubescence rather long, involved, hairs in large part 
unbranched, none really stellate; sepals pubescent; petals apparently 
yellow, about twice as long as sepals: fruiting inflorescence corymbose; 
pods rather few (4-6), broadly lanceolate, flattened, densely pubescent 
with simple or branching hairs, 5-8 cm. long: style about i mm. long: 
seeds not winged. 
The name D. Gilhertiana has been given to herbarium sheets of 
