Sisymbrium polyceratium L.

Annual herb. Stems decumbent to suberect, glabrous, (10)–20–50–(70) cm tall. Lvs glabrous. Rosette and lower cauline lvs pinnatifid, 2–10 × 1–3 cm; terminal lobe ovate; lateral lobes triangular. Stem lvs simple, hastate or ovate, distantly toothed, 1–3 × 0.5–1 cm. Fls sessile or subsessile, paired or fascicled in axils of leaflike bracts. Sepals sparsely hairy or glabrous, not horned, 1–1.5 mm long. Petals pale yellow, 1.5–2 mm long. Anthers 0.3–0.5 mm long; filaments c. = sepals. Siliques glabrous, suberect, linear-cylindric, curved, 10–20 × 1–2 mm; style 1–2 mm long. Seeds ovoid, brown, 0.6–1 mm long.

[From: Webb et al. (1988) Flora of New Zealand. Volume 4.]

Flowering: Jan.–Mar.; Fruiting: Jan.–Mar.