194 PITTONIA. 
short, ovate-oblong: pods about 2} inches long, acutish, 
curving downwards on slender spreading or recurved pedi- 
cels of an inch or more: seeds very distinctly biserial. 
Mountain districts of northern Arizona about Flagstaff. 
This might perhaps include the A. arcuata var. longipes of 
Watson; but that varietal name is not available for the 
species, there being an European A. longipes of recent date 
^ A. GRACILENTA. Perennial, with a number of slender 
erect or ascending stems from the root, and several short 
leaf-bearing shoots intermixed, the tallest stems scarcely 
exceeding a foot in height; herbage pale and glaucescent 
as well as subcinereous with a minute branched pubescence 
which, under a strong lens, is seen to be dendroid rather 
than stellate: lowest leaves (on sterile shoots) narrowly ob- 
lanceolate, entire; cauline oblong-linear, sessile and with 
somewhat hastately divergent auricles: racemes slender and 
few-flowered: sepals thin and with purple-scarious margins; 
petals also thin, of more than twice the length of the sepals, 
with rather broadly spatulate and delicately venulose rose- 
purple limb: pods glabrous, about two inches long, narrow, 
straight or nearly so, on filiform slightly decurved almost 
divaricate pedicels: seeds in two very closely contiguous 
rows. 
An elegant and most distinct new member of this group, 
known to me only in Mr. Heller’s collection from the 
vicinity of Santa Fe, New Mexico; the label reading, more 
Helleriano, “Arabis Fendleri, Heller. Authentic specimen, 
from type-locality.” Nevertheless, nothing like the Fend- 
lerian plant on which A. Fendleri should be based is in Mr. 
Heller’s collection! 
/ À. EREMOPHILA. General habit of the last, but caudex 
more loosely branched, the sterile shoots longer and more 
