1. Polygonum biaristatum Aitch. & Hemsl. in J. Linn. Soc., Bot. 18: 90. 1881; Kom., Fl. URSS 5: 607. t. xxxix. f. 5. 1936; Kitamura, Fl. Afgh. 89. 1960; Rech. f. & Schiman-Czeika in Rech. f., Fl. Iran. 56: 68. 1968; R.R.Stewart, Ann. Cat. Vasc. Pl. W. Pak. & Kashm. 204. 1972.
Prostrate, branched from base, branches up to 12 cm long, glabrous, smooth, perennial undershrub. Stems many, woody, with thick, woody rhizome, internodes short. Leaves 7-10 x 1-2 mm, elliptic-obovate, acute-acuminate or mucronulate, sessile or subsessile, subcoriaceous, margins revolute. Ochreae 1-2.5 mm long, ovate-lanceolate, tubular, membranous, bifid, each with strong veins extending with 2 strong ferruginous awns/aristae. Inflorescence axillary, 1-2-flowered. Flowers 1-2 mm across, shortly pedicellate or sessile. Ocrheolae small, tubular, ovate, lacerate. Tepals red, 5, parted, almost half of their length, equal, 2-3 x 0.5-0.75 mm, oblanceolate, obtuse. Stamens 8, filaments long, equal, slightly broader at base. Ovary 1.5-3.0 x 1.0-1.5 mm, trigonous, with 3 styles and capitate stigmas. Nuts 2-3.5 x 1.75-2.5 mm, ovate, trigonous, glabrous, black.
Fl. Per.: June-September.
Type: Seratigah, at 12000 ft; a dense woody minature shrub, July 19th, 1879, J. E. T. Aitchison 816 (BM!, K!).
Grows on dry stony slopes between 3000-4000 m. Not a common species in our area; Distribution: Central Asia (Pamir-Alai, Tien Shan), Afghanistan and Pakistan.