贺兰山南芥 he lan shan nan jie

Arabis holanshanica Y. C. Lan & T. Y. Cheo.

Herbs perennial, (3-)8-20(-30) cm tall, scapose; caudex branched, covered with stramineous, persistent petioles of previous years; trichomes simple, subsetose, to 1.5 mm, rarely mixed with short-stalked, forked ones, often restricted to leaf margins and adaxial surface of sepals. Stems erect or ascending, leafless or few leaved. Basal leaves rosulate; petiole 0.5-3.5(-5) cm, narrowly winged, ciliate, persistent; leaf blade oblanceolate, spatulate, or obovate, (0.6-)1.5-4.5(-6) cm × (3-)5-10(-14) mm, base attenuate, margin entire or sparsely serrulate distally, ciliate, apex acute. Cauline leaves 1-3 or absent, narrowly oblong or lanceolate, sessile. Racemes ebracteate or rarely lowermost 1-3 flowers bracteate. Fruiting pedicels 2-10(-20) mm, divaricate, straight, slender. Sepals oblong, 2.5-4 × 1-1.5 mm, abaxially sparsely pubescent, rarely glabrous, not saccate. Petals white, pink, or purplish, spatulate, 6-9 × 2-3 mm, apex obtuse. Filaments 4-7 mm; anthers oblong, 0.7-1 mm. Ovules 12-26 per ovary. Fruit (1.5-)2.5-5(-7) cm × 1.5-2 mm; valves glabrous, slightly torulose, with a prominent midvein extending full length; style slender, 1-3 mm. Seeds brown, oblong, 1.4-2.5 × 0.8-1.4 mm, uniseriate, winged distally. Fl. May-Jun, fr. Jun-Jul.

* Calcareous slopes, forest margins, streamsides; 2300-4200 m. Gansu, Nei Mongol, Ningxia, Qinghai, Shanxi, Sichuan.

The above first record from Shanxi is based on Smith 7449 (UPS).