243 



BISULCATI. 24. 



Pods wholly l-cellecl, pendent on a slender stipe 

 which exceeds the calyx except in A. oocalycis, oval to 

 linear, 7-25 mm. long, 5-7 mm. wide, triangular-pointed 

 to apiculate, completely obcompressed ventrally, and 

 dorsfllly often flat, nearly smooth to conspicuously and 

 parallel-cross-veined, chartaceous, opening along the 

 ventral suture if at all, not explanate, cross section that 

 of a vertical half-section of the figure 8 by having the 

 ventral side bisulcate, the grooves being on each side of 

 the conspicuously raised and thickened suture (when 

 young the pods are normally greatly laterally compressed 

 and not sulcate), ventral suture often convex, rigid, with 

 a thin edge, dorsal suture not evident. Flowers 7-15 mm. 

 long, narrow (broad in oocalycis), with slightly exserted 

 claws, horizontal, reflexed in fruit, densely spicate, be- 

 coming looser in f^Mit, many, the keel conspicuously 

 elongated and mostly as long as the banner. Banner 

 nearly ovate, 5-7 mm. long, with sides greatly reflexed 

 and so seemingly narrow, deeply notched, rather 

 abruptly arched beyond calyx tips and keel to at least 

 45% veined below. Wings obliquely oblanceolate, nar- 

 row, obtuse, much arched and exposing base of keel, not 

 over 2 mm. wide, barely surpassing keel. Keel blade lu- 

 nate in general outline, about 7 mm. long, the base 

 straight and then gently arched to the nearly erect and 

 rounded purple-spotted tip, about 3 mm. wide. Calyx in- 

 clined to be inflated, very thin and hyaline, normally 

 white, rarely red, saccate at base on the upper side, 2-5 

 mm. long, cylindric-campanulate, oblique at tip and 

 base, a little laterally flattened, not contracted at either 

 end, inserted on the lower corner, teeth subulate from a 

 deltoid base, not as long as tube, unequal. Pedicels in- 

 serted on lower corner of calyx and often at right angles 

 to it, filiform (almost none in A. oocalycis), ascending, 

 in fruit often 5 mm. long. Bracts conspicuous, very thin, 

 with very narrow or thread-like tips, as long as pedicels, 

 5-7 mm. long. Peduncles proper generally as long as 

 leaves, and with the rachis in fruit 1-5 dm. long, strict 

 and erect, sulcate as well as the stems and petioles. Stip- 

 ules rather large r.bove, hyaline, triangular, green- 

 tipped, spreading or reflexed, not connate. Upper leaves 

 with short petioles or none, 5-10 cm. long and the largest, 

 the lowest leaves very small and long-petioled. Leaflets 

 about 10 (8-15) pairs, petiolulate, and jointed to rachis, 

 flat, obtuse, about smooth, 1-2.5 cm. long, rather broadly 

 linear to elliptical. Stems slender, tufted and erect. 



