08 



3AB2C. 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. 

 i6 raontanus. 

 3A2B. Caespitose 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 SL-lcate 

 dorsally to the middle but not at tip or base, cavity larger than 

 the seeds and a little inflated, few-seeded. Plants blooimng 

 all summer. Humistrati. 



17 humistratus. 



18 sesqulflorua. 



Pods minute or seldom as long as calyx, one seeded, never 1 cm. 

 long, elliptical to ovate. Leaves with slender petioles, hairy 

 with closely appretsed and straight hairs. 

 3A3B. Caespitose and acaulcscent plants or with stems with inter- 

 nodes not longer than the large, connate, hyaline, hairy and im- 

 bricated stipules. Leaflets obtuse. Bracts relatively larg«, 

 about equaling the calyx, longer than the pedicel in humillimus 

 Pubescence not attached at the ond exceot 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. Calvx 

 teeth about or a little more than half the tube which is 

 obliquely conic and 3-4 mm. long and spreading. 

 , 20 Gilensis. 



