Erysimum cheiranthoides Linnaeus var. sinuatum Franchet; E. sinuatum (Franchet) Handel-Mazzetti; E. yunnanense Franchet.

Herbs annual, (9-)20-70(-100) cm tall. Trichomes primarily 3- or 4-fid, sometimes mixed with 5-fid ones, malpighiaceous trichomes primarily on stem and pedicels. Stems erect, often branched above, ribbed. Basal leaves rosulate, withered by fruiting. Lowermost and middle cauline leaves shortly petiolate or subsessile; leaf blade linear, lanceolate, or oblong, (1-)2-7(-8) cm × (1.5-)2.5-10(-15) mm, mostly with 3- or 4-fid trichomes, base cuneate, margin sinuate-dentate, dentate, or subentire, apex acute or obtuse; uppermost leaves sessile and often entire. Racemes corymbose, densely flowered, ebracteate, elongated considerably in fruit. Fruiting pedicels divaricate or ascending, 3-7(-9) mm, slender, much narrower than fruit. Sepals narrowly oblong, 2-3.5 × 0.4-0.7 mm, not saccate. Petals bright yellow, linear to linear-oblanceolate, 3.5-5(-5.5) × 0.3-0.5(-0.7) mm, apex obtuse; claw undifferentiated from limb. Filaments yellow, 2-4 mm; anthers oblong, 0.4-0.7 mm. Ovules (20-)30-60(-70) per ovary. Fruit linear, terete or slightly 4-angled, (1-)2-3.5(-4) cm × 1-1.3 mm, somewhat torulose, suberect or divaricate-ascending, straight; valves with a distinct midvein, outside with 3-5-forked trichomes, inside densely pubescent; style slender, 0.5-1.5 mm, cylindric; stigma slightly 2-lobed. Seeds oblong, (0.6-)0.7-0.9(-1) × 0.4-0.5 mm. Fl. and fr. Mar-Jul.

An examination of the types of Erysimum macilentum, E. sinuatum, and E. yunnanense readily reveals that they are conspecific. Both E. sinuatum and E. yunnanense were recognized in FRPS as distinct species, whereas E. macilentum was reduced to the synonymy of E. cheiranthoides.

* Wastelands, roadsides, mountain slopes, fields; 100-2500 m. Anhui, Gansu, Hebei, Henan, Hubei, Hunan, Jiangsu, Jilin, Liaoning, Nei Mongol, Ningxia, Shaanxi, Shandong, Shanxi, Sichuan, Yunnan.