190 BOTANICAL GAZETTE [ SEPTEMBER 
capsule permanently finely pubescent, from broadly oval to 
orbicular ; stigma sessile in the narrow shallow notch: cotyledo 
incumbent. eo 
Most nearly allied to Z. afeta/um Willd., from which it differs in being 
lower and more divaricately branched from near the base, while Z. apefalun 
has a stem simple at base and branched above. L. pubicarpum is wh 
restricted below the flower cluster, since this is very short and the pedicels 
become gradually divaricate. Its puberulent capsules separate it at once frm 
L. apetalum. 
Two collections secured: no. 6235, Nez Perces creek, Yellowstone path 
July 30; no. 6793, Dwelle’s, Mont., August 31, 1899. 
Arabis densicaulis.—Biennial or possibly more enduring, the 
tap root producing several or more often numerous crowded 
stems from its crown: stems ascending, 3—5% high (including 
the raceme), leafy only toward the base, simple or some of the 
larger ones sparingly branched, glabrous or slightly hirsute neat 
the base: root-leaves crowded-rosulate, oblanceolate, alee 
petioled, 2~3°™ long, finely stellate-pubescent ; stem-leaves rather 
numerous, glabrous, broadly linear or tapering uniformly from 
a broadish base to an acute apex, auriculate-clasping, the lobes 
short: flowers small, the petals white or purplish, linear-spatua® 
about 5™" long and nearly twice as long as the oblong sepals: a 
fruiting raceme very long, often two thirds of the whole lengts : 
the numerous pods arcuate and widely divaricate oF sone 
drooping but not pendulous, 4—5™ long, about 2” wide, | Fe 
obscurely I-nerved at base; the pedicels about fee! long: * 
oval, in one row, scarcely winged; the cotyledons obliq! 
approaching incumbent. em 
The cotyledons seem to indicate this as : member of the section i 
BRINA (Syn. Fl. 1: 159), but I am unable to find in any of the known ™® | 
a close ally. It may be recognized easily by its numerous stems fT" 
the crowns, and by the numerous, widely divaricate, arcuate 
long, naked racemes. 
The type Specimens were secured on partly wooded, hard, grav 
slopes, near Undine falls, Yellowstone park, July 6, 1899, no. se 
Arabis fructicosa.— Similar in size and habit to of nee 
ing, glabrous throughout except for some fine stellate ane 
at base: the stems even more numerous, with cate! . 
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