CONTRIBUTIONS FROM THE ROCKY MOUNTAIN 
HERBARIUM. I. 
AVEN NELSON, 
Draba Yellowstonensis.— Annual, with stems of two kinds; 
the principal stem slender, erect, scape-like, 2-3" high includ- 
ing the raceme,,simple or with long-peduncled racemes from the 
uppermost axil or axils; the one or more accessory stems from 
the base slenderer and shorter, ascending or erect: leaves mostly 
basal; root-leaves rosulate, from broadly linear to narrowly 
elliptic, sub-acute, entire or nearly so, I-2°™ long; the few (2-4) 
stem leaves mostly near the base, narrowly ovate, generally 
smaller than the root-leaves ; pubescence on the leaves finely 
stellate, on the stems and peduncles sparse, the hairs more or 
less branching : racemes long in fruit, usually more than half the 
whole height of the plant: pedicels shorter than the capsules: 
flowers small; the sepals elliptic, obtuse, about half as long as 
the petals; the petals cuneate-spatulate, barely emarginate, 
» 2-3 long: capsule linear-oblong, tapering slightly to 
the apex, 10-13™" long, finely pubescent; the style very short 
(less than 0.5™ long) but evident; the stigma 2-lobed. 
Avery distinct species, having its nearest ally in D. montana Wats., a plant 
aA of More southern range. 
\ Two Collections of this were secured in Yellowstone p&rk where it occurs 
A Siete rane ee 
L operidium pubicarpum.— Annual, with slender vertical tap 
-gcthe stem paniculately branched from near the base, in well 
“evelo, ped plants the branches similarly branched, only O15 
high ams | ding the racemes, obscurely puberulent: leaves small, 
Slabrous yor nearly so, linear or somewhat spatulate, acute, the 
broader ¢ .ynes remotely cut-toothed: beginning to blossom when 
Nery smal, fd, the fruiting raceme crowded: pedicels short, hardly 
Pe jong asY\ the capsule : petals wanting, the sepals purplish : 
ae : XN 189 
