Sisymbrium erysimoides Desf.

Annual herb with 10–80 cm. high erect stems, unbranched or with a few branches in the upper parts, sparsely hairy.. Basal leaves similar to cauline ones, evanescent; cauline leaves petioled, lyrate-pinnatisect, with 2–3 pairs of lateral lobes; lamina thin, coarsely serrate, 2–18 cm. long, with 2–3 pairs of 0.5–4 cm. long lateral lobes and a larger rather acute terminal lobe; petiole 0.5–4 mm. long.. Racemes terminal, dense, with numerous small flowers, in fruit rather dense to lax, up to 50 cm. long; pedicels spreading (often at 90° angle), 1.5–3 mm. long, as wide as the siliqua, usually horizontally oriented.. Sepals yellowish green, narrowly oblong, ± 2.5 mm. long.. Petals pale yellow, narrowly spathulate, 2–3.5 mm. long, ± equalling the sepals.. Stamens distinctly tetradynamous, the longer ones 1.5–2 mm. long; anthers ± 0.5 mm. long.. Ovary narrowly cylindrical, with very short style and semiglobular stigma.. Siliqua straight, somewhat subulate and when fully ripe distinctly tapering upwards, 15–40 cm. long, ± 1 mm. broad; valves glabrous; style ± 1 mm. long, very narrow.. Seeds pale yellow or red-brown, oblong in outline, 1–1.2 mm. long, ± 0.5 mm. broad, nearly smooth.. Fig. 22, p. 63.