1. Sisymbrium irio Linnaeus, Sp. Pl. 2: 659. 1753.
水蒜芥 shui suan jie
Arabis charbonnelii H. Léveillé.
Herbs annual, (10-)20-60(-75) cm tall. Stems erect, branched below and above, glabrous or sparsely pubescent at least basally. Basal leaves not rosulate; petiole (0.5-)1-4.5(-6) cm; leaf blade oblanceolate or oblong in outline, runcinate-pinnatisect, (1.5-)3-12(-15) × (0.5-)1-6(-9) cm; lateral lobes (1 or)2-6(-8) on each side of midvein, smaller than terminal, oblong or lanceolate, entire, dentate, or lobed. Uppermost cauline leaves smaller than basal, entire or 1-3-lobed. Fruiting pedicels divaricate or ascending, slender, much narrower than fruit, (5-)7-12(-20) mm. Sepals oblong, erect, 2-2.5 × 1-1.5 mm. Petals yellow, oblong-oblanceolate, 2.5-3.5(-4) × 1-1.5 mm; claw subequaling sepals. Filaments yellowish, erect, 2.5-4 mm; anthers oblong, 0.5-0.9 mm. Ovules 40-90 per ovary. Fruit narrowly linear, slender, terete, (2.5-)3-4(-5) cm × 0.9-1.1 mm, straight or slightly curved inward, younger ones overtopping flowers; valves glabrous, slightly torulose; style 0.2-0.5 mm; stigma prominently 2-lobed; septum membranous. Seeds oblong, 0.8-1 × 0.5-0.6 mm, inserted in depressions of septum. Fl. May-Aug, fr. Jun-Sep. 2n = 14.
Rocky slopes, orchards, roadsides, fields, pastures, waste grounds, prairies, disturbed sites; near sea level to 1700 m. Nei Mongol, Taiwan, Xinjiang [Afghanistan, India, Kashmir, Nepal, Pakistan, Tajikistan, Turkmenistan, Uzbekistan; W Asia, Europe].
The above first record from Nei Mongol is based on Liu 12 (MO).