Sisymbrium polyceratium L.
horned mustard
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.
S.: C. Otago.
Mediterranean 1933
Locally common on bare ground, waste land and roadsides.
