Trees of unknown dimensions with fuscous unarmed branches, glabrous except for minutely pilosulous lf-axes, lft-margins, and fruit, the foliage bicolored, the small narrow lfts dull olivaceous above, pallid beneath, the inflorescence (presumably of the genus) unknown; perulate buds plumply ovoid 1-3 mm, the striate greenish castaneous scales microscopically ciliolate. Stipules lacking. Lf-formula iv- v/22-25; lf-stk 19-25 mm, the petiole 5-8 mm, the longer interpinnal segments 5-6 mm; a sessile cupular nectary ±0.6 mm diam and 0.3 mm tall situated below midpetiole, smaller nectaries at tip of lf-stk and of all pinna-rachises; pinnae accrescent distally, the longest 2-3 cm, the longer interfoliolar segments 0.8-1 mm; lfts decrescent only at extremities of rachis, otherwise subequilong, linear from obliquely rectangulate base, triangular-acute, slightly arched forward, those near midrachis 4.5-6 x 0.9-1.1 mm, 5-5.5 times as long as wide; venation of 3 nerves from pulvinule, the subcentric midrib porrect at tip, giving rise on each side to 1-2 weak secondary branches, the anterior primary nerve tenuous, the posterior one produced to anastomosis beyond midblade, the whole venulation immersed on upper face of blade, finely prominulous beneath. Inflorescence unknown. Pods in outline undulately linear, attenuate at both ends, to 17 x 0.7 cm, the sutures ±0.6 mm wide, each shallowly widely constricted between the 13-14 seeds, the interseminal isthmi plane, mostly ±3-5 mm wide, the stiffly papery, fuscous-brown, venulose, sparsely puberulent valves low-convex over each seed, when ripe randomly decurved and twisted (ribbonlike) and fully dehiscent along both sutures, the valves separating to release the seeds; seeds basipetal on a filiform contorted funicle, in broad outline ±5 x 3.7 mm, the smooth testa pale fawn-color, the U- shaped pleurogram ±2.5 x 1.4 mm.

In semideciduous woodland (probably caatinga) near 500 m, known only from the type locality at 10°57'S, 40°27'W in N Bahia. — Ripe fr. in IX.

Although Ch. extortum is known to us through only one collection, we have no hesitation in describing it. Its slender, sinuously linear pod, constricted between seeds and after dehiscence randomly twisted like that of Pithecellobium unguis-cati (but not red inside) is unlike that of any previously known Chloroleucon.