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

1. Arabis amplexicaulis Edgeworth, Trans. Linn. Soc. London, Bot. 20: 31. 1851.

抱茎南芥 bao jing nan jie

Herbs biennial or short-lived perennial, (20-)30-60(-70) cm tall, densely to sparsely hispid or hirsute, with primarily simple subsetose trichomes to 1.7 mm, these mixed with much fewer, smaller, stalked 2-4-forked ones. Stems erect, often single from base. Basal leaves rosulate; petiole 0.5-5 cm; leaf blade lanceolate-obovate, oblong, or oblanceolate, 3-9(-11) × 1-2(-3) cm, base attenuate, margin dentate or entire, ciliate, apex obtuse or rounded. Middle cauline leaves sessile, oblong or ovate, (1-)1.5-5(-8) × 0.6-2.5(-4) cm, base cordate or amplexicaul, margin dentate or entire. Racemes ebracteate. Fruiting pedicels divaricate, 0.6-1.5 cm, slender, straight, glabrous. Sepals oblong, 4-6 × 1.2-1.5 mm, glabrous, lateral pair saccate. Petals white, oblong or narrowly oblanceolate, (0.7-)0.9-1.2 cm × 2-3.5 mm, apex obtuse. Filaments 3.5-6 mm; anthers oblong, 0.8-1 mm. Ovules 50-70 per ovary. Fruit (2.5-)3.5-6.5(-7) cm × 1-1.5 mm, erect, divaricate, or rarely reflexed; valves with a distinct midvein, torulose, glabrous; style 1-1.5 mm. Seeds brown, oblong, 1.2-1.5 × 0.8-1 mm, uniseriate, narrowly winged apically. Fl. Apr-Jun, fr. May-Jul. 2n = 16.

Forest margins, shady places; 1800-3200 m. Xizang [Afghanistan, Bhutan, India, Kashmir, Nepal, Pakistan].

The description of Arabis amplexicaulis in FRPS and the material so named that was examined by the present authors in various Chinese herbaria represent misidentifications of A. paniculata. However, the occurrence of true A. amplexicaulis in China (Xizang) is here confirmed based on Qinghai-Tibet Team 6886 (PE).


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