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FOC | Family List | FOC Vol. 8 | Brassicaceae | Alyssum

9. Alyssum canescens de Candolle, Syst. Nat. 2: 322. 1821.

灰毛庭荠 hui mao ting ji

Alyssum canescens var. abbreviatum de Candolle; Ptilotrichum canescens (de Candolle) C. A. Meyer.

Herbs perennial, often pulvinate, (1-)2-9(-12) cm tall, silvery canescent throughout, with short-stalked, stellate trichomes rhomboid in outline and with (3 or)4, branched, principal rays from stalk apex. Stems usually erect or ascending, often several from woody base, sterile shoots often several. Cauline leaves fleshy, sessile; leaf blade oblong or linear, 4-12(-15) × 0.5-2(-3) mm, often grooved adaxially, base attenuate, apex obtuse or subacute. Fruiting pedicels ascending, (3-)4-7 mm, slender, often curved, base subappressed. Sepals oblong, 1.5-2.2 × 1-1.5 mm, deciduous, stellate. Petals white, obovate, 2-3(-3.5) × 1.5-2.5(-3) mm, glabrous outside, caducous, apex rounded; claw often pink, minutely papillate at base. Filaments 1.5-2 mm, dilated and papillate at base, neither winged nor appendaged, lateral pair often minutely dentate above base; anthers ovate, 0.4-0.5 mm. Ovules 1 per locule. Fruit broadly ovate or elliptic-ovate, (2-)4-5 × (1.5-)2-3 mm, apex acute; valves not veined, slightly flattened, densely stellate; style 0.5-2 mm, slender, glabrous. Seeds 1 per locule, ovate, 1.4-1.8 × 0.8-1.1 mm, compressed, not margined. Fl. Jun-Sep, fr. Jul-Oct.

Dry rocky slopes, grassy areas, grasslands, river banks, rock crevices, gravel, alpine steppe; 1000-5000 m. Gansu, Hebei, Heilongjiang, Jilin, Nei Mongol, Ningxia, Qinghai, Shaanxi, Shanxi, Xinjiang, Xizang [Kashmir, Kazakhstan, Mongolia, Russia (Siberia)].


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