- ≡ Coronopus didymus (L.) Sm., Fl. Brit. 2, 691 (1804)
- ≡ Senebiera didyma (L.) Pers., Syn. Pl. (Persoon) 2, 158 (1807 [1806])
- = Senebiera pinnatifida DC. (1799) nom. illeg.
Foetid annual or biennial with short-lived rosette and procumbent to ascending glabrous or sparsely hairy stems to 40 cm long. Lvs 1–2-pinnatifid, narrow-oblong to ovate, glabrous except for sparse spreading hairs on petioles of some basal lvs; rosette lvs petiolate, 6–10 ×1.5–2 cm; stem lvs smaller, usually pinnatifid, rarely 2-pinnatifid, 1–4 × 0.5–1.5 cm. Racemes (1)–3–5 cm; rachis with sparse spreading hairs; pedicels spreading, 2.5–4 mm long. Sepals c. 0.5 mm long. Petals white, < sepals or 0. Stamens usually 2, rarely 4. Silicle broader than long, emarginate, c. 1.5 × 2–2.5 mm; valves finely warty or ridged, separating at maturity; stigma minute, almost sessile in apical notch of silicle. Seed comma-shaped, light brown, c. 1 mm long.
[From: Webb et al. (1985) Flora of New Zealand. Volume 4 as Coronopus didymus (L.) Sm.]