Persicaria glabra (Willd.) M. Gomez, Anales Inst. Segunda Ensen 2: 278. 1896; Hara in Hara et al., Enum. Fl. Pl. Nep. 3: 176. 1982; Grierson & Long, Fl. Bhutan 1(1): 161. 1983; Fl. North Amer. @ eFloras.org vol. 5; Fl. Pak. @ eFloras.org Pakistan V. 205; Polygonum glabrum Willd., Sp. Pl. 2: 447. 1799; Meisn. in DC., Prodr. 14: 115. 1856; Hook. f., Fl. Brit. Ind. 5: 34. 1890; Cooke, Fl. Pres. Bomb. 3: 5. 1958 (Reprint ed.); Collett, Fl. Siml. ed. 2: 422. 1921 (Reprint 1980); Kaur & Sharma, Fl. Sirmaur 550. 2004; Maheshwari, Illustr. Fl. Delhi f. 188. 1966; Fl. China @eFloras.org 5: 288.

Perennial herbs, glabrous throughout. Stem erect, up to 1.5+ m tall, reddish at base, branched, rarely dilated at nodes, often rooting at nodes. Leaves alternate; petioles 8-10 mm long, broad at base; leaf blade lanceolate or oblong-lanceolate, 10-25 cm x 1-3 cm, base narrowly cuneate, margin entire, eciliate, apex narrowly acuminate; both surfaces gland-dotted, blade without dark blotch adaxially. Ochrea tubular, light brown, 10-30 mm, membranous, base inflated, mouth truncate, eciliate, surface glabrous, veins numerous. Inflorescences mostly terminal, sometimes also axillary, erect to slightly nodding, usually uninterrupted, spicate, 3-10 cm, usually with several dense spikes, aggregated and panicle-like, peduncle 1-5 cm, glabrous, ochreolae usually funnelform, not ciliate, usually each 3- or 4-flowered. Pedicels erect to spreading, longer than bract, 3-4 mm long, articulate at apex. Perianth pink, glabrous, campanulate, non-accrescent; tepals 5, connate ca. 1/3 their length, obovate or elliptic, 3-4 mm, margin entire, apex obtuse to rounded, veins slender, furcate at apex, not curved downward. Stamens 6-8, included; filaments ca. 2 mm long, free, outer ones adnate to perianth tube; anthers bithecous, ovate, ca. 7 mm long. Carpels 2 or 3, syncarpous; ovary ca. 1 mm long, biconvex; styles 2(-3), erect, ca. 2 mm long, connate below nearly to middle; stigmas capitate. Achenes included in persistent perianth, black-brown, shiny, ovoid, biconvex, 2-2.5 mm, not winged.

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