Kirk's description is: "Glabrous. Stems much branched, terete, flexuous, suberect, 1 ft.-11/2 ft. long. Leaves distant, narrow, oblong-cuneate or oblong-spathulate, acutely toothed or incised above, sessile or very shortly petioled. Racemes terminal. Stamens 4. Pedicels strict, slender, more than twice as long as the pods. Pods ovate, cordate at the base, truncate at the apex, with a broad notch, slightly keeled and winged; style slightly exceeding the notch.― , A. Rich. Fl. N.Z. 310, t. 35 (not of Forst.).

Perennial, glabrous except for distinctive pale clavate hairs on pedicels and slender hairs on sepals. Stems spreading to erect, stout, barely flexuous, 20-50 cm tall. Lvs all similar, oblanceolate-spathulate, sharply and finely serrate, cuneately narrowed to broad flat petiole about = lamina, 1.5-5-(7) × 0.5-0.8-(1.5) cm. Racemes terminal on short leafy branchlets, 2-6 cm long; pedicels erecto-patent, 5-8 mm long at fruiting. Sepals c. 1.5 × 1 mm. Petals white, narrowly obovate, c. = sepals. Stamens 4. Silicle broadly ovate, notched at apex, slightly winged, 5-5.5 × 4-5 mm; style very short; stigma slightly > notch. Seeds broadly ovoid, brown, narrowly winged, c. 2.5 × 2 mm.