266 
EDWIN BLAKE PAYSON 
23. Draba pterosperma Payson n. sp. 
Loosely cespitose perennial; caudex branched; leaves mostly in 
round tufts either on the apices of the caudex-branches or rising above 
the ground on sparingly leafy shoots or sobols, oblong, 3-5 mm. long, 
1-2 mm. broad, rounded at the apex, midvein evident; pubescence 
silvery, loosely stellate, cilia present: scapes slender, pubescent, 2-6 
cm. long: flowers showy; sepals pubescent; petals yellow, 7-8 mm. 
long, over twice as long as the sepals: fruiting inflorescence elongated: 
pods 6 or 8, broadly lanceolate, 8-9 mm. long, 4-6 mm. broad, flattened 
and often unsymmetrical, pubescent with stellate hairs: style slender, 
2 mm. or more long: seeds about 4 in each cell, Jproadly winged. 
Because of the winged seeds in this species and in D. asterophora 
one would be inclined to consider them closely related but such is 
probably not the case. This plant seems to be related to ventosa 
and so we must assume that the development of winged seeds has been 
accomplished independently by two diflferent groups. 
Specimens Examined. — California: rock crevices, Marble Mt., 
Siskiyou Co., July 10, 1910, Geo. D. Butler, no. 1716 (type in Ry. 
Mt. Herbarium); Marble Mt., June, 1901, H. P. Chandler, no. 1654 
(Mo. Bot. Card. Herbarium and perfectly typical). 
24. D. ARGYREA Rydb. Bull. Torrey Club 30: 251. 1903. 
Type Locality. — Sawtooth Mts., Idaho, head of Pettit Lake. 
The specimens cited below are somewhat doubtfully referred here. 
Since, however, no authentic material of D. argyrea has been available, 
since our plants agree fairly well with the description and are from 
the same vicinity it has been thought best to leave the question un- 
decided. 
Specimens Examined. — Idaho: rock crevices, alpine basin in 
Sawtooth Mts., above Redfish Lake, Blaine Co., Aug. 9, 1916, Mac- 
bride & Payson, no 3677; crevices in granitic rocks. Smoky Mts., 
Blaine Co., Aug. 13, 1916, Macbride & Payson, no. 3734. 
25. Draba sphaerocarpa Macbride and Payson, n. sp. 
CespitOvSe perennial; caudex much branched; leaves mostly borne 
in tufts on erect, nearly leafless shoots that rise above the caudex- 
branches, oblong or obovate, obtuse, 4-7 mm. long, thickish and mid- 
vein indistinct; pubescence finely and densely stellate; leaves silvery, 
cilia absent: scapes pubescent, rather stout: flowers unknown (prob- 
ably yellow) : fruiting raceme elongated, developing almost from very 
