Annual. Root wiry or stout. Stems erect, 15–50(–150) cm high, bristly. Sepals 5–10 mm long, erect; petals 12–20 mm long, yellow or white. Fruit erect, 2–9 cm long (including beak), 3–4(–6) mm wide; valves firm, constricted between seeds, readily breaking into ribbed, bony, 1-seeded units; beak narrowly conical, 10–30 mm long; pedicel 10–25 mm long; seeds usually 1–12, 1–4 mm long, light brown.
MuM, Wim, GleP, VVP, VRiv, MuF, GipP, OtP, WaP, Gold, CVU, DunT, NIS, EGL, EGU, WPro, HSF, HNF, OtR, Strz, HFE, VAlp. Naturalized all States, Asia, the Americas. Probably native to Europe and northern Africa. Flowers winter-spring.
Without fruit, this species may be confused with Sinapis arvensis but that species has spreading sepals and darker yellow petals.
Source:
Entwisle, T.J. (1996). Brassicaceae. In: Walsh, N.G.; Entwisle, T.J., Flora of Victoria Vol. 3, Dicotyledons Winteraceae to Myrtaceae, pp. 399–459. Inkata Press, Melbourne.
