68 
SAB2C. Kentrophyti. Caespitose and prostrate plants. (one 
variety erect) with densely matted stems which are mostly 
very slender and with very short internodes. mostly longer 
than the stipules. Flowers nearly sessile among the leaves, 
blooming throughout the summer, reflexed as well as the 
pods. Bracts minute, shorters than the pedicels. Leaves 
very short or with no petiole, the whole rarely 2 cm. long. Leaf 
lets folded, elliptical to nearly linear, acuminate and acer- 
Ose not jointed to the rachis, with thick midrib, 2-3 pairs. 
Flowers very small and very much arched and hooded. Pods 
rarely over 4 mm. long, claw like, ovate or broadly oblong, 
rarely twice the calyx, about 1-seeded. This group connects 
directly with the Humistrati. 
16 montanus, 
3A2B. Czespitose or decumbent and widely spreading. Plants 
with slender stems when less condensed, and mostly with in- 
ternodes many times longer than stipules. Stipules large, con- 
nate, hyaline. Flowers small and stubby on conspicuous 
short pedicels, inclined to be subracemose, ascending to hori- 
zontal, with conspicuous and subulate (rarely ovate) bracts 
which are much longer than pedicels. Keel tip triangular and 
sharp. Leaves with conspicuous petioles when leaflets are 
less than 5 pairs, Leaflets 3-10 pairs, close-set (more distant 
in A. humistratus var. tenerrimus) flat or rarely folded, all 
jointed to rachis not acerose nor with thick midrib, with hairs 
not attached at the end but closely appressed and straight. 
Bracts elongated. Pods conspicuously lunate or ovate or fal- 
cate-oblong and abruptly contracted at tip to a long and aci- 
cular point, much longer tthan calyx, 1-2 cm. long, mostly 
conspicuously compressed laterally and with cross section obo- 
vate to obcordate chartaceous, nearly smooth, mostly sulcate 
dorsally to the middle but not at tip or base, cavity larger than 
the seeds and a little inflated, Tew-seeded. Plants blooimng 
all summer. Humistrati. 
17 humistratus. 
18 sesquiflorus. 
Pods minute or seldom as long as calyx, one seeded, never 1 cm. 
long, elliptical to ovate. Leaves with slender petioles, hairy 
with closely appressed and straight hairs. 
3A3B. Czespitose and acaulescent plants or with stems with inter- 
nodes not longer than the large, connate, hyaline, hairy and im- 
bricated stipules. Leaflets obtuse.  Bracts relatively large, 
about equaling the calyx, longer than the pedicel in humillimus 
Pubescence not attached at the end except in A. troglodytes. 
3A3BC. Leaflets 3-8 pairs, elliptical to oval, mostly flat. .Ped- 
uncles conspicuous, Humillimi. 
3A3BCD. Flowers single to very few, not over 5 mm. long. 
19 humillimus. 
3A3BC2D. Flowers 10 or more in heads or spikes on very short 
pedicels and with long-triangular bracts about equaling 
the calyx. Peduncles conspicuously longer than the leaves 
(about twice as long) and ascending or erect, relatively stout 
Crowns few and large, woody. Leaves narrow, about 1 dm. 
long, with 6-10 pairs of elliptical flat, leaflets 5-10 mm. 
long and contiguous. Pods somewhat longer than the calyx 
and splitting it. Flowers not less than 5 mm. long. Calyx 
teeth about or a little more than half the tube which is 
obliquely conic and 3-4 mm. long and spreading. 
M m 20  Gilensis. E 
