Erysimum planisiliquum (Fischer & C. A. Meyer) Steudel; Sisymbrium planisiliquum (Fischer & C. A. Meyer) J. D. Hooker & Thomson.

Herbs (10-)15-50(-75) cm tall, mostly glabrous and glaucous. Stems erect, simple. Basal leaves withered by flowering. Middle cauline leaves broadly ovate or narrowly oblong, (1.2-)2-7(-10) × (0.5-)1-2.5(-3) cm, base deeply cordate-amplexicaul, margin entire, apex shortly mucronate; basal auricles ovate or lanceolate, to 1.5 cm. Fruiting pedicels slender, (4-)7-12(-15) mm, erect-ascending, subappressed to rachis, minutely papillate adaxially or rarely glabrous. Sepals linear, ascending, 3-4.5 × 0.5-1 mm, subequal, not saccate at base. Petals white or creamy white, with purplish veins extending to apex, oblong, 5-7 × 1.5-2 mm, apex obtuse; claw broad, 3-4 mm. Filaments slender, median pairs 3-4.5 mm, lateral pair 2-2.5 mm; anthers 1-1.2 mm. Ovules 24-44 per ovary. Fruit linear, latiseptate, (3-)3.5-8.5(-10) cm × 1.3-2 mm, erect or ascending, straight or rarely slightly curved, torulose, subsessile; valves obscurely veined; style 0.5-1.2(-2) mm; stigma entire. Seeds brown, oblong, 1.5-2 × 0.7-1 mm; cotyledons nearly incumbent. Fl. May-Jun, fr. Jun-Aug. 2n = 14.

Mountain slopes, sandy deserts, steppe; 300-3600 m. Xinjiang, Xizang [Afghanistan, India, Kashmir, Kazakhstan, Kyrgyzstan, Mongolia, Pakistan, Russia, Tajikistan, Turkmenistan, Uzbekistan; SW Asia].