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Leaves paripinnate, with leaflets in 1–many pairs (elsewhere occasionally 1-foliolate); stipules intrapetiolar, linear, caducous; leaflets sessile or subsessile, opposite, occasionally with single glands near base of leaflet.
Pods compressed, woody, glabrous, dehiscing with twisting valves, without longitudinal nerves, but upper suture with a longitudinal wing-like ridge on either side projecting in a plane at right-angles to the valve.
Flowers spirally arranged in terminal or axillary racemes; bracteoles well developed, petaloid (pink or white), opposite, valvate, enveloping the flower bud, persistent.
Ovary stipitate, with stipe adnate to the side of the hypanthium; ovules 1–5; stigma terminal, abruptly enlarged.
Unarmed trees, shrubs, or subshrubs with mostly annual shoots from a woody rootstock.
Stamens 3–6(8), normally 3 in the Flora area; staminodes sometimes present.
Petals (0)1(3), well developed and elliptic when present.
Seeds compressed, elliptic, without areoles.
Hypanthium short, cupular.
Sepals small, 0–6.
