Podo-sclerocarpi. 143 
erect or less. Wings oblong to narrowly oblong, oblique 
and rounded, scarcely arched, about 4 mm. longer than keel, 
very thin. Keel 7 mm. long, straight, the tip abruptly arched 
to erect and broadly deltoid and 3 mm. high. Calyx like 
that of Toanus but rather narrower, slightly oblique at 
tip, hyaline, sinuses rounded, teeth much shorter than tube, 
Pedicels stout, in fruit 2-5 mm. long, in flower very short 
and about as long the subulate bracts. Peduncles angled, 
rarely as, long as the leaves, stout, Leaves about 2.5 cm. 
long, ascending, the middie ones the largest. Petioles al- 
most none, angled. Leaves very wide and short. Leaflets 
coarsely 1-nerved, about 3 pairs (rarely 10 pairs in pectina- 
tus), 2,5-5 cm. long, linear when flat, almost filiform when 
folded, rarely linear-oblanceolate, often alternate, arcuate, 
acute, mostly not jointed to the short rachis. Stipules: 
‘green, reddish below, very long tipped. Stems sulcate 
strongly, nearly 2 ft. high, not tangled, moderately stout, 
barely flexuous, with internodes shorter than the upper 
leaves. Plants ashy-pubescent. Stipules conspicuous. Pub- 
escence of broad and flat hairs attached by base and closely 
appressed. Roots stout thick and erect. From the Green 
river bad lands of Wyoming to Kansas and northward in al-- 
kaline soil. Upper part of Lower and lower part of Middle 
Temperate life zones, A 
Po 1s erect. 99 Grayi. 
Pods reflexed. IOO pectinatus. 
AB2C. Pods opening most along the ventral suture except at tip: 
and mostly first at tip. Ventral suture either straight or con- 
cave, never arched as much as the dorsal. Sutüres not raised 
in the green state, but evidently so in the dry. Pods in- 
clined to be obcompressed, angled or winged when dry, strict- 
ly 1-celled (the dorsal suture a trifle impressed in pterocar- 
pus) conspicuously falcate, not inflated, ascending as well as 
flowers. Stems rather zigzag and flexuous. Leaves narrow, 
short-petioled, with several pairs of mostly straight leaflets: 
Stipules small, not connate, 
AB2CD. Pods with rounded sides, not all angled or winged, 
purple or mottled, oblong-lanceolate and acuminate at tip 
and shortly so at base, about 1 cm. wide. Flowers purple, 
racemose, loose. Stems few in a place and inclined to be de- 
cumbent. Growing in well drained gravelly sagebrush slopes 
preferably where there is a little alkali seep. 
Pods narrow, nearly round in cross-section. 101 Casei, 
AB2C2D. Pods when dry laterally winged and with wings 2 mm, - 
wide, sessile, erect (as well as the flowers except rarely 
in A. pterocarpus), acute but not acuminate at tip, obtuse 
but narrowed at base, very finely cross-veined, smooth, 3-4 
cm. long, arcuate, with sutures narrow and not much thick- 
ened. Flowers short-spicate. Calyx triangular-acute at 
base, the lower side straight, upper side a trifle arched, at- 
tached on lower corner, hyaline. Terminal leaflet not jointed 
to rachis, leaflets not early deciduous but attached by very 
delicate petiolules, linear, rarely the lowest ones narrowly 
oblong. Leaves not widely spreading. Densely tufted 
stems slender and nearly straight, erect, freely branched 
mostly, from woody root, succulent and very hard to dry. 
Growing in low places. j . 
* Pods broad, much obcompressed and 2-winged. 102 pterocarpus. 
Pods narrow, not eats 4-winged. : sag bas. 
