Polygonum coriarium Grig. in Acta Inst. Bot. Acad. Sci. URSS, Ser. 1 (Fl. Syst. Pl. Vasc.) 1: 101. 1933 [=Trudy Bot. Inst. Acad. Nauk SSR, Ser. (Fl. Syst. Vyss. Rast.) 1: 101. 1933. Polygonum bucharicum Grig. in Act. Inst. Bot. Acad. Sci. URSS, Ser. 1, 1: 102. 1933; Rech. f. & Schiman-Czeika in Rech. f., Fl. Iran. 56: 52. 1968; R.R.Stewart, Ann. Catal. Vasc. Pl. W. Pak. & Kashm. 104. 1972; Pleuropteropyrum bucharicum (Grig.) Nevski in Flora & System. Pl. Vasc. 4: 217. 1937; Aconogonon nuristanicum Kitam. in Act. Phytotax. Geobot. 17: 141. 1958 nom. illegit.; Aconogonon coriarium (Grig.) Sojak subsp. bucharicum (Grig.) Sojak in Preslia 46: 151. 1974; Aconogonon bucharicum (Grig.) Houlb in Folia Geobot. Phytotax. Praha 11: 80. 1976.

An erect, 1-1.5 (-2.5) m tall perennial herb. Stem somewhat divaricately and profusely branched, mostly glabrous or with few hairs usually below the nodes. Leaves (3.5-) 4-12 x 2-4.5 (-5) cm, ovate to ovate-lanceolate, petiole 3-4 mm long, acute to acuminate, broadly cuneate or rounded at the base, mostly entire, ciliate at the margin, glabrous above, sparsely to densely pubescent below. Ochrea 1.5 (-1.8)-2.8 (-3) cm long, ovate to orbicular, membranous, caducous, glabrous or pilose, brown. Inflorescence a branched terminal panicle with numerous dense flower clusters, 5-12 cm long, branches nodding in fruit. Flowers creamy white, 3.0-3.5 mm across, pedicel 2-5 mm long. Ochreolae ovate-orbicular, brown, membranous, pellucid, glabrous. Tepals 5, subequal, obovate, rounded or blunt at the apex, 3-5 (-6) x 1.5-3 (-3.5) mm. Stamens 8, filaments much longer than the anthers. Ovary, 3.0-4.0 x 1.75-2.75 mm, lanceolate ovate-trigonous with 3, very small styles; stigmas capitate. Nuts subsessile, ovate, trigonous, not beaked 3-5 x 2-3.5 mm, smooth, ± dull brownish, included or slightly exserted from the tepals.

Fl. Per.: June-July.

Type: Russia: Kazakhstan, Dzungarian Ala Tau, Kora river, Kopal Distr. Tobasch-bulak, Lipsky 2964 (LE).

Grows in between the altitudinal ranges of 1400-3500 m on damp slopes along with the streams; Distribution: Kazakstan, Tadzhikistan, Uzbekstan, Turkemenistan, Afghanistan and Pakistan.