Description from Flora of China
Epilobium fischerianum Pavlov; E. palustre var. lavandulifolium Lecoq & Lamotte ex Haussknecht; E. palustre var. majus C. B. Clarke; E. palustre var. minimum C. B. Clarke; E. rhynchocarpum Boissier.
Herbs perennial, erect, with filiform stolons terminating in small fleshy turions that leave brown basal scales. Stems (5-)15-70 cm tall, simple or well-branched, strigillose throughout or subglabrous on lower part, rarely with lines decurrent from margins of petioles. Leaves sessile or petioles to 3 mm; cauline blade sublinear to narrowly lanceolate or elliptic, 1.2-7 × 0.3-1.2(-1.9) cm, sparsely strigillose adaxially and on abaxial veins or rarely glabrescent, base rounded or cuneate, margin entire to obscurely denticulate with 5-9 teeth per side, occasionally revolute, apex acute or obtuse. Inflorescence erect or slightly nodding in bud, densely strigillose, sometimes with glandular hairs; flowers erect. Sepals 2.5-4.5 mm. Petals white to pink, 3-7(-9) mm. Stigma clavate to subcylindric, entire. Capsules 3-9 cm, strigillose; pedicels 1-5 cm. Seeds brown, (1.1-)1.3-2.2 mm, finely papillose, with prominent chalazal collar 0.08-0.3 mm; coma dull white or rarely tawny, not easily detaching. Fl. Jun-Aug, fr. Aug-Sep. 2n = 36.
Wet places along streams, rivers, bogs, and marshes, often disturbed, and in subalpine meadows, widespread; 200-4500(-5000) m. Gansu, Hebei, Heilongjiang, Jilin, Liaoning, Nei Mongol, Qinghai, Shaanxi, Shanxi, Sichuan, Xinjiang, Xizang, Yunnan [India, Japan, Kazakhstan, Korea, Mongolia, Nepal, Pakistan, Russia; widespread in C, N, and SW Asia, Europe, and North America (including Greenland)].