Plants annual.
Stems (0.7)1.5–10(15) dm, ribbed.
Trichomes 3–4(5)-rayed.
Basal leaves withered by fruiting.
Cauline leaves middle and upper lanceolate, linear, or elliptic-oblong, (1)2–7(11) × (0.2)0.5–1.2(2.3) cm, margins subentire, denticulate, or rarely sinuate-dentate; short-petiolate or sessile.
Inflorescences fruiting pedicels divaricate or ascending, 5–13(16) mm, much narrower than fruits.
Flowers sepals oblong, 1.8–3.2 mm, lateral pair not saccate; petals spatulate, 3–5.5 × 1.5–2 mm, yellow, claws 1.5–3.5 mm, petal tips rounded; median filaments 2–3.5 mm; ovules (20)30–55 per ovary, styles slender, 0.5–1.5 mm, stigmas entire or slightly 2-lobed.
Fruits 4-angled, somewhat torulose, (1)1.5–2.5(4) cm × 1–1.3 mm; valves with distinct midveins, pubescent outside with 3–5-rayed trichomes, densely pubescent inside.
Seeds oblong, 1–1.5 × 0.4–0.6 mm; wings absent.
2n=16.
Pastures, fields, waste grounds, disturbed areas, dry creek beds. Flowering Apr–Aug. 50–1400 m. BR, BW, Col, Lava, WV. CA, ID, NV, WA; throughout Canada and US; Asia, Europe. Exotic.
as described under Erysimum cheiranthoides
Annuals. Trichomes of leaves primarily 3- or 4-rayed, some-times mixed with 5-rayed ones, 2-rayed trichomes primarily on stem and pedicels. Stems erect, often branched distally, (ribbed), (0.7-)1.5-10(-15) dm. Basal leaves (withered by fruiting), similar to cauline. Cauline leaves: (median and distal) shortly petiolate or sessile; blade (lanceolate, linear, or elliptic-oblong, (1-)2-7(-11) cm × (2-)5-12 (-23) mm, base cuneate) margins usually subentire or denticulate, rarely sinuate-dentate, (apex acute or obtuse). Racemes considerably elongated in fruit. Fruiting pedicels divaricate or ascending, slender, much narrower than fruit, 5-13(-16) mm. Flowers: sepals oblong, 1.8-3.2 mm, lateral pair not saccate basally; petals yellow, narrowly spatulate, 3-5.5 × 1.5-2 mm, claw 1.5-3.5 mm, apex rounded; median filaments 2-3.5 mm; anthers oblong, 0.5-0.7 mm. Fruits suberect or divaricate-ascending, linear, straight, somewhat torulose, (1-)1.5-2.5(-4) cm × 1-1.3 mm, 4-angled, not striped; valves with prominent midvein, pubescent outside, trichomes 3-5-rayed, densely pubescent inside; ovules (20-)30-55 per ovary; style cylindrical, slender, 0.5-1.5 mm; stigma entire or slightly 2-lobed, lobes as long as wide. Seeds oblong, 1-1.5 × 0.4-0.6 mm; not winged. 2n = 16.Flowering Jun-Aug. Dry stream beds, moist areas, waste ground, fields, pastures, disturbed ground; 0-3000 m; introduced; Alta., B.C., Man., N.B., Nfld. and Labr. (Nfld.), N.W.T., N.S., Nunavut, Ont., P.E.I., Que., Sask., Yukon; Alaska, Ark., Calif., Colo., Conn., D.C., Fla., Idaho, Ill., Ind., Iowa, Kans., Maine, Md., Mass., Mich., Minn., Mo., Mont., Nebr., Nev., N.H., N.J., N.Mex., N.Y., N.C., N.Dak., Ohio, Oreg., Pa., R.I., S.Dak., Tenn., Utah, Vt., Va., Wash., W.Va., Wis., Wyo.; Europe; Asia; n Africa.