184 
16 STRIGULOSI. 
Pods chartaceous to papery, pendent (apparently ascending 
in A. Tolucanus), partly to fully 2-celled by the intrusion of the 
dorsal suture as a thin partition, rarely much sulcate dorsally, 
inclined to be wider above, linear to oval, stipitate (almost sessile 
in A. reptaus and Cobreusis, and fully so in platytropis), inflated 
(scarcely so in A. recurvus and straturensis), with cross-section 
triquetrous to round, with ventral suture the more arched or if it 
is concave toward the end then the tip is declined (except in A. 
Cobrensis). Flowers about horizontal, small (large and 2 cm. 
long in A. reptans), rarely 1 cm. long, white or whitish (banner 
rarely purple), with campanulate calyx and triangular teeth most- 
ly about as long as tube. Peduncles slender, at least as long as 
the leaves (sometimes shorter in A. Tolucanus). Leaves slender, 
short-petioled (long-petioled in A. platytropis), with rather 
many pairs of leaflets which are narrowly to broadly elliptical 
(sometimes linear in A. Brandegei), obtuse and mostly thin, 
nearly contiguous (except in A, recurvus and Brandegei). Stip- 
ules connate below (free in A, straturensis and Brandegei), 
Stems slender to filiform, decumbent to weakly erect (creeping 
and rooting in A, reptans), flexuous, with rather many internodes 
(almost none in A. platytropis). Tufted perennials (A. Brande- 
gei is a winter annual) of the Middle Temperate to the Tropical 
life zones (A, platytropis appears as if subalpine), ‘This rather 
loosely inter-related group is closely connected with the Atrati 
but lacks the very narrow rakish leaves and abortin g leaflets and 
rigid petioles, etc. The species are all southern (except A, platy- 
tropis), reaching only to central Utah, growing among pine for- 
ests and junipers mostly and rarely in oak brush. A. platytrops 
grows in rich soil in coniferous open forests, and reptans seems to 
grow in rich and open warm meadows. 
KEY 
A. Pods linear, curved, papery, not inflated, not wider above, evident- 
ly stipitate, about 1.5 cm. long and 2-3 mm. high, triquetrous in cross- 
section, and sulcate dorsally. Flowers rather many, racemose, broad, 
about 7 mm. long. Calyx tube about 2 mm. ‚acute at base, with teeth 
nearly as long as tube. Peduncles in the upper axils and about 1 dm. 
long and with floral rachis 1-2 dm. long in addition. Pedicels 1-2 mm. 
long, and nearly equaled by the ovate bracts. Leaflets narrow. Stems 
densely tufted and 1-3 ft. long, with rather many internodes 3-8 cm. 
ong. Recurvi. 2 3 
