STUDIES IN THE CRUCIFERA. 193 
branching ligneous caudex, the stems usually few or soli- 
tary, often 2 feet high, the racemes both in flower and fruit 
longer and looser thanjin A. mazima, the pale flowers not 
half as large: tufted basal leaves broadly oblanceolate, acute, 
with few and coarse teeth or none, the midnerve not con- 
spieuous, the whole leaf 1 to 13 inches long, the pubscence 
dense on both faces and more nearly stellate: lower cauline 
leaves spatulate, with dilated petiole and strongly serrate- 
toothed blade, the upper oblong, sagittate-clasping and revo- 
lute: stem sparsely hispid with nearly or quite simple 
hairs; pedicels and calyx with a denser more branched but 
hispid rather than stellate hairiness: petals rose-color: pods 
glabrous, more than 3 inches long, strongly eurved down- 
wards on very short (2 or 3 lines long) exactly divaricate 
rigid pedicels: seeds uniserial. 
Very common in the middle mountains of the northern 
parts of California and adjacent Oregon and Nevada. An 
excellent type is my own “A. arcuata, Gray,” from near 
Yreka, 1876. As the fruit is more strongly arcuate than in 
Nuttall’s S. arcuatus, I have applied here the Greek equiva- 
lent of that homonym. 
JA. GRACILIPES. Size and habit of the last, less pubes- 
cent, more pronouncedly glaucous; leaves more ample and 
of thinner texture, the dentate basal ones asperulous with 
minute stellate hairs; cauline glabrous, ovate-lanceolate, 
sessile by a broad but only slightly auricled base, not revo- 
lute but the margins of all apt to be remotely denticulate: 
basal part of stem hispidulous with simple hairs, all the 
upper portion as well as the rachis of the raceme and the 
pedieels glabrous and very glaucous: sepals narrow, den- 
dritic-hairy at the tips; petals narrow, far surpassing the 
calyx, rose-colored ; filaments all elongated, those of even 
the short stamens surpassing the calyx; anthers unusually 
