STUDIES IN THE CRUCIFERJE. 195 
loosely leafy; leaf-blades oblong-lanceolate, saliently den- 
tate; branched pubescence more dense and less notably 
dendroid, i. e., the branched portion more shortly stalked 
and subsessile: cauline leaves sparse, linear, with very short 
and inconspicuous auricles: rose-red petals small, not venu- 
lose: very narrow pods 14 inches long, their pedicels almost 
or quite half as long, spreading: seeds in one row. 
Common about Peach Springs, northern Arizona; flow- 
ering and fruiting in April. Also at Aztec, New Mexico, 
C. F. Baker, 3 May, 1899. 
/ À. RECONDITA. General habit, inflorescence and small 
pods of the last two, but smaller, the foliage thinner, 
greener, with a sparse and minute stellate pubescence: 
leaves obovate, dentate, abruptly narrowed to a rather long 
and slender petiole, the base of this more or less notably 
ciliate with simple hairs, or hairs shortly and divaricately 
forked at the very summit: filiform pedicels glabrous, but 
calyx stellate-pubescent: petals rose-purple: pods glabrous, 
1 to 14 inches long, spreading, slightly curved: seeds im- 
perfectly biserial. 
Diamond Creek Cafion, a tributary of the Colorado, in 
northern Arizona, N. C. Wilson, April, 1893. Also, in 
larger form, less pubescent, and with narrower leaves, from 
Glenwood Springs, Colorado, Geo. E. Osterhout, 1899, 
labelled by him as A. Lyallii. 
v A. oxvroBULA. Low, apparently suffrutescent, the 
slender stems only 5 inches high, shortly and loosely race- 
mose at summit: tufted basal leaves about an inch long, 
narrowly oblanceolate, acute, entire, the slender petiolar 
base sparingly hispid-ciliate, otherwise glabrous, not at all 
glaucous; the 2 or 3 cauline oblanceolate, $ inch long, 
sessile, not auriculate: pods about 5, linear, straight, about 
