Erect herb (probably annual or short-lived perennial), 50–120 cm. high, with a few long ascending branches, ± densely hispid on stem, leaves and pedicels.. Cauline leaves indistinctly petiolate to sessile, up to at least 12 cm. long and 5 cm. broad, oblong in outline, the lower pinnatipartite to lyrate-pinnatifid, with up to 5 pairs of oblong doubly dentate lateral lobes and a larger terminal lobe, the upper undivided and coarsely dentate, successively bract-like.. Racemes bracteate, dense, with numerous small flowers, in fruit with persistent bracts, very lax, up to 35 cm. long, with 4–9.5 mm. long ascending stiff pedicels; bracts elliptic to narrowly elliptic, doubly serrate to dentate, up to 12 mm. long, usually somewhat longer than the pedicels.. Sepals green-purplish, oblong, hispidulous, ± 4 mm. long.. Petals yellow, spathulate, ± 8 mm. long and ± 2.5 mm. broad.. Longer stamens ± 6 mm. long.. Siliquae when unripe curved, when ripe usually straight except apically, 25–40 mm. long, 2.5–3.2 mm. broad; beak 2.8–5.2 mm. long, with prominent nerves; valves with prominent midnerve; stigma rather flat.. Seeds red-brown, spherical to oblong in outline, 1.2–1.5 mm. long, ± 1.2 mm. broad, with distinct coarse reticulum.
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