STUDIES IN THE CRUCIFER. 191 
Collected at Moor's Station among the dry hills of east- 
ern Nevada, 16 July, 1896, in fruit only. Allied to A. 
subpinnatifida, but the leaves different and pods very char- 
acteristic, being obtuse, the vacant apex broad and flat. 
' A. RECTISSIMA. Rigidly erect, simple and rather slender, 
14 to 18 inches high, very glaucous throughout, glabrous 
except as to the basal leaves, these spatulate-lanceolate, an 
inch long or somewhat less, loosely ciliolate, with short, 
rigid, mostly simple, hairs, both faces sparsely setulose-his- 
pid, the hairs commonly forked: cauline leaves nearly 
glabrous, their few setulose hairs usually simple: fruiting 
raceme often a foot long: pods 2 to 3 inches long, $ line 
wide, very straight, strongly refracted on short pedicels, 
acute; valves 1-nerved: seeds uniserial, narrowly winged. 
Known only from middle elevations in the mountains of 
Fresno County, California; collected by Mrs. Peckinpah in 
1890. 
^ A. DURIUSCULA. Suffrutescent, rather slender, 2 feet 
high, the naked woody stem below the leafy and floriferous 
branches often 6 to 10 inches high; the clustered leaves 
subtending these oblanceolate, acute, entire, about ? inch 
long, thickish, glaucous, very minutely pubescent with short 
hairs divaricately forked or branched at summit; scattered 
cauline leaves 4 inch long, oblong, sessile by a broad but 
scarcely auricled base, glabrous and glaucous, as also the 
stem and pods: flowers 10 to 15, very small, the reddish 
petals little surpassing the calyx and erect: pods deflexed, 
about 23 inches long and a line wide, the valves 1-nerved 
. and venulose: seeds in two rows, small, winged. 
Known to me only from the vicinity of Donner Lake, in 
the Sierra Nevada of middle California, where it was col- 
lected by Miss Michener in 1893; and Mr. Sonne distributed 
8856—3 
