Arabidopsis yadungensis K. C. Kuan & Z. X. An; Arabis alpina Linnaeus var. purpurea W. W. Smith; A. latialata Y. C. Lan & T. Y. Cheo.

Herbs biennial or short-lived perennial, (10-)20-60(-80) cm tall, densely or rarely sparsely hirsute, primarily with simple trichomes, these often mixed at least distally with long-stalked, forked or rarely stellate ones. Stems erect, simple from base, simple or branched above. Basal leaves rosulate; petiole often absent, rarely distinct and to 4 cm; leaf blade spatulate, oblanceolate, narrowly obovate, or oblong, (1-)2-7(-9) × (0.5-)1-2(-3) cm, base attenuate, margin dentate, serrate, or rarely entire, often ciliate, apex obtuse or acute. Middle cauline leaves sessile, oblong, elliptic, or ovate-lanceolate, (1-)2-4(-5) cm × (2-)4-10(-15) mm, hirsute, with predominantly simple trichomes, base auriculate, cordate, or rarely amplexicaul, margin dentate or entire, apex obtuse or acute. Racemes ebracteate. Fruiting pedicels erect or rarely ascending, often subappressed to rachis, 4-10(-16) mm, slender, straight. Sepals oblong or sublanceolate, 2.5-3.5 × 1-1.5 mm, often glabrous, not saccate. Petals purple, pink, or rarely white, oblong or narrowly oblanceolate, 6-9 × 2-3 mm, apex obtuse. Filaments 3.5-5 mm; anthers oblong, 0.6-1 mm. Ovules 40-80 per ovary. Fruit (2.5-)3-5(-6) cm × 1.5-2 mm, erect, appressed to rachis; valves with a prominent midvein extending full length, torulose, glabrous; style 0.5-1 mm. Seeds brown, orbicular to ovate-orbicular, 1-1.6 mm in diam., uniseriate, broadly winged all around; wing (0.1-)0.2-0.4 mm wide. Fl. (Mar-) May-Jul, fr. Jun-Oct.

The above first record from Sichuan is based on Wilson 3215 (A) and Guan Kejian & Wang Wencai 239 (MO, PE); the above first record from Yunnan is based on K. M. Feng 1239 & 2473 (A).

Arabis alpina var. purpurea was listed in FRPS as a synonym of A. paniculata. However, an examination of the type collection of the former (Forrest 13977; holotype, E; isotypes, K, P) clearly shows that it is indistinguishable from plants of A. pterosperma. The type collections of A. latialata and Arabidopsis yadungensis represent fruiting and flowering material, respectively, of A. pterosperma.

Roadsides, woodlands, grassy slopes, alpine meadows; 2900-4300 m. Qinghai, Sichuan, Xizang, Yunnan [Bhutan, India, Kashmir, Pakistan, Nepal, Sikkim].