Description from Flora of China
Persicaria kuekenthalii H. Léveillé; P. viscosa (Buchanan-Hamilton ex D. Don) H. Gross ex Nakai; Polygonum kuekenthalii H. Léveillé; P. viscosum var. minus J. D. Hooker.
Herbs annual, odoriferous. Stems erect or ascending, 50-90 cm tall, much branched, densely hirsute and glandular hairy. Petiole short or nearly absent; leaf blade ovate-lanceolate or elliptical-lanceolate, 5-15 × 2-4 cm, both surfaces hispid, densely so along veins, margin entire, densely shortly ciliate; ocrea tubular, 1-1.2 cm, membranous, densely glandular hairy and hirsute, apex truncate, long ciliate. Inflorescence terminal or axillary, spicate, 2-4 cm, usually several spikes aggregated and panicle-like; peduncles densely hirsute and glandular hairy; bracts funnel-shaped, hirsute and glandular hairy, margin sparsely long ciliate, each 3-5-flowered. Pedicels longer than bracts. Perianth pinkish, 5-parted; tepals elliptic, ca. 3 mm. Stamens 8, included. Styles 3, connate to below middle. Achenes included in persistent perianth, black-brown, shiny, broadly ovoid, trigonous, ca. 2.5 mm. Fl. Jul-Sep, fr. Aug-Oct.
Roadsides, grasslands, by ditches; sea level to 1900 m. Anhui, Fujian, Guangdong, Guangxi, Guizhou, Heilongjiang, Henan, Hubei, Hunan, Jiangsu, Jiangxi, Jilin, Liaoning, Shaanxi, Sichuan, Taiwan, Yunnan, Zhejiang [India, Japan, Korea, Nepal, Russia (Far East)].