永宁酸模 yong ning suan mo

Herbs perennial. Stems erect, 70-120 cm tall, branched, glabrous, grooved. Basal leaves elliptic, 7-15 × 3-5 cm, abaxially minutely papillate along veins, adaxially glabrous, base cuneate, margin entire, apex acute; cauline leaves small; petiole short or nearly absent; ocrea fugacious, brown, thinly membranous. Inflorescence terminal, paniculate; rachis erect. Flowers bisexual. Pedicel filiform, 6-8 mm, articulate at base. Inner tepals enlarged in fruit; valves triangular-cordate, ca. 5 × 4 mm, all without tubercles, net veined, base deeply cordate, margin nearly entire, apex obtuse. Achenes brown, shiny, narrowly ovoid, ca. 2.5 mm, apex acute. Fl. Jun-Jul, fr. Jul-Aug.

* Mountain slopes, valleys; 2500-3000 m. NW Yunnan (Yongning).

One of us (Grabovskaya-Borodina) believes that this is better placed near Rumex aquaticus, after R. popovii.