An annual ± pilose herb up to 40 cm. tall.. Leaves imparipinnate; stipules rather papery, ovate-lanceolate, entire, up to 4 mm. long and 2·5 mm. wide; rhachis up to 12 cm. long; leaflets usually opposite in 5–9 pairs, elliptic-oblong, up to 10 mm. long and 5 mm. wide, cuneate at the base, notched at the apex, pilose beneath, glabrous above.. Racemes axillary, rather dense, shorter than the subtending leaf, 1–11-flowered, the peduncle up to 3 cm. long; bracts linear-lanceolate, 1–2 mm. long; pedicels 1 mm. long, spreading in fruit.. Calyx green, stiffly pilose, the hairs often black; tube ± 1·5 mm. long; teeth subequal, linear-lanceolate, ±1·5 mm. long.. Corolla bluish or reddish, glabrous; standard elliptic-oblong, cuneate at the base, without appendages, ± 5 mm. long and 3 mm. wide; blade of wing ±3×1 mm., auriculate, slightly pouched; claw 1·5 mm. long; blade of keel ± 3 ×1·5 mm., pouched, auricle ± 1 mm. long; claw 1·5–2 mm.. Only 5 stamens fertile, the vexillary stamen, where present, free and reduced to a straight sterile staminode; filament-sheath 3 mm. long, free parts 0·7 mm., those of the 4 alternate sterile stamens much reduced or absent; anthers 0·3 mm. long.. Ovary glabrous or appressed pubescent, ± 3 mm. long and 0·8 mm. wide, divided longitudinally by a vertical septum; ovules 5–10 on each side; style glabrous, curved, 0·7 mm. long.. Pod shortly (± 1 mm.) stipitate, glabrous or appressed pubescent, brown, indehiscent, oblong, flat, with a crest at each side which is usually coarsely toothed, up to 35 mm. long and 7 mm. across from crest to crest, narrower at the septum (which is only 0·3 mm. wide) than on each side (± 1 mm.).. Seeds yellowish-brown, ± sculptured, deeply and narrowly notched at the hilum, ± 1·8 × 1·8 × 0·8 mm.
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