Alyssum tortuosum Waldst. & Kit. ex Willd.

The above description is based on non-Chinese material. The Xinjiang plants examined by the present authors are tentatively assigned to this species.

Herbs perennial, cespitose, 6-30(-50) cm tall, often woody at base, canescent throughout, with sessile, 10-18-rayed stellate trichomes. Stems tortuous at base, slender, several from caudex, sterile shoots often absent at flowering. Cauline leaves subsessile; leaf blade narrowly obovate or oblanceolate, 0.5-2(-2.5) cm × 1-3(-5) mm, gradually smaller upward, base attenuate, apex acute to subacuminate. Racemes corymbose, in a panicle terminating each stem. Fruiting pedicels divaricate or rarely ascending, (2-)3-6(-8) mm, slender, straight or slightly curved upward, uniformly stellate. Sepals oblong, 1.2-1.8 × 0.5-0.6 mm, deciduous, stellate. Petals yellow, spatulate, 1.5-3 × 0.7-1 mm, glabrous or stellate outside, caducous, base attenuate, apex often obtuse or rounded. Filaments 1-1.5 mm; median pairs unilaterally broadly winged, apically 1- or 2-toothed; lateral pair with a lanceolate basal appendage apically acute; anthers ovate, 0.2-0.3 mm. Ovules 1(or 2) per locule. Fruit elliptic to elliptic-obovate, 2.5-4(-4.5) × (1.5-)1.8-2.5 mm, apex obtuse to subacute; valves not veined, often asymmetrically inflated on 1 side, flattened on other, densely covered with stellate trichomes; style 0.5-1.5 mm, slender, glabrous or sparsely with stellate trichomes basally. Seeds 1(or 2) per locule, ovate, 1.1-1.4 × 0.8-1.1 mm, compressed, not margined. 2n = 16, 32.

Xinjiang [Kazakhstan, Russia, Turkmenistan; SW Asia, Europe].

Alyssum alpestre Linnaeus var. tortuosum (Willdenow) Fenzl.

Alyssum tortuosum là một loài thực vật có hoa trong họ Cải. Loài này được Willd. mô tả khoa học đầu tiên năm 1800.

扭庭荠（学名：Alyssum tortuosum）为十字花科庭荠属的植物。分布在中国大陆的欧洲、西伯利亚等地，目前尚未由人工引种栽培。