Sisymbrium orientale L.
oriental mustard
Annual herb. Stems erect, softly hairy, to 1 m tall. Lvs sparsely to densely hairy. Rosette and lower stem lvs lyrate-pinnatifid or pinnatifid to almost lyrate-pinnate, 5-10-(30) × (1)-2-8-(15) cm; terminal lobe ovate to triangular to hastate; lateral lobes in 1-5 pairs, narrow-lanceolate or triangular, entire, sinuate or coarsely toothed. Upper stem lvs usually smaller with narrower, but not linear-filiform lobes, or hastate, or ovate and not lobed. Racemes often flexuous, ebracteate, glabrous or sparsely hairy, 20-40-(60) cm long. Pedicels 3-5 mm long, elongating to c. 10 mm long at fruiting, sparsely hairy. Sepals usually hairy, 3-5 mm long, not horned. Petals yellow, 6-10 mm long. Anthers 1-1.5 mm long; filaments > sepals. Silique glabrous or hairy, spreading, linear-cylindric, (40)-60-100 × 1-1.5 mm; style 0.5-2 mm long. Seeds oblong, brown, c. 1 mm long.
N.; S.; K.: throughout.
S. Europe, Asia Minor, N. Africa 1932
Widespread weed especially in waste places.
