Erect to suberect, branching, herbaceous, annual shrub, 1—3 m tall. Roots are hollow or pith-filled. Stem is glabrous, soft, with abundant, spirally arranged, white or pale green adventitious root primordia, which may develop into hemispherical, green nodules. Leaves are alternate, composite, stipulate, sensitive; petiole and rachis 3—18 cm long, 1.5—3 cm in short, axillary branchlets; leaflets (20—)50—100, linear-oblong, 8—20 mm x 1.5—3 mm, 4—7 mm long in leaves on axillary branches, entire or finely denticulate, glabrous. Inflorescence an axillary raceme, 2—6 cm long with 1—6 flowers; bracts glabrous, 3—8 mm x 2—5 mm; pedicel 5—9 mm long (in fruit up to 12 mm), pubescent; calyx bilabiate, glabrous or slightly pubescent on the outside, 6—8 mm long and 4—4.5 mm wide; corolla pale to bright yellow; standard elliptical to obovate, 9—12 mm x 7—10 mm; wings free, 7 mm x 2 mm; keel petals pubescent, about elliptical, loosely adnate, 9—11 mm x 3—4 mm. Pod 5—8 cm x 7—8 mm, venose when young, very warty and dark brown to black when mature, with 6—10 1-seeded segments. |
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