Rumex angulatus Rech. fil.

R. angulatus is a close relative of R.longifolius DC. and R. pseudonatronatus Borb.; both are northern species.

Herbs perennial. Stems erect, purple-red, 40-60 cm tall, glabrous, grooved. Basal leaves: petiole 3-5 cm; leaf blade oblong-lanceolate, 15-20 × 3-5 cm, both surfaces glabrous, base cuneate, apex acute; cauline leaves shortly petiolate, lanceolate; ocrea fugacious, membranous. Inflorescence terminal, paniculate, dense; rachis slightly zigzagged. Flowers bisexual. Pedicel filiform, slender, articulate below middle. Inner tepals enlarged in fruit; valves orbicular-cordate, ca. 5 × 4 mm, all without tubercles, net veined, base cordate, margin nearly entire or irregularly minutely crenate, apex obtuse. Achenes yellow-brown, shiny, ovoid, trigonous, ca. 3 mm. Fl. Jun-Jul, fr. Jul-Aug.

Perennial with tap root, plant often tinged purplish. Stem strict, erect, 40-80 (-110) cm high, sometimes flexuous, with short arcuate-erect flowering and fruting branches, not fasciculate, unbranched, forming a rather narrow condensed fruiting panicle. Basal leaves not known; lower stem leaves with short petiole, up to 15 x 4 cm, lanceolate, broadest in the middle, shrotly tapering towards the base, longer towards the apex, with ± indistinctly cordate base, flat; stem leaves gradually smaller and with short petioles, uppermost subtending the lowest inflorescence branches sometimes narrowly linear. Flower whorls many-flowered, all very densely congested. Pedicels very thin, equalling or up to 1.5 times longer than the valves, indistinctly articulate below the middle. External perianth segments 1.5 mm long, appressed to the base of the valves. Valves about 5 mm long and broad, very finely reticulate, orbiculate-cordate, entire or subentire, grainless or the anterior sometimes with a very small grain. Nut ± 2.5 mm long, pale brown, subequally attenuate at boath ends.

Xizang [Afghanistan, Kashmir, Pakistan].

Distribution: Ladakh, W. Xizang, Indus Valley, Kashmir, Chitral and Afghanistan.

Watersides, moist valleys; 3000-4200 m.

R. orientalis Hook.f., Fl. Brit. Ind. 5: 58. 1890 p.p. nec Bernh. 1830.

Rumex angulatus là một loài thực vật có hoa trong họ Rau răm. Loài này được Rech. f. miêu tả khoa học đầu tiên năm 1949.

紫茎酸模（学名：Rumex angulatus），为蓼科酸模属下的一个种。