Epilobium platystigmatosum C. B. Robinson

Herbs perennial, loosely clumped with leafy basal soboles. Stems (9-)15-70 cm tall, usually branched throughout, densely leafy, strigillose throughout, lacking raised lines. Petiole 1-4 mm; cauline leaf blade sublinear to narrowly lanceolate, 1-4.5 cm × 1.5-5 mm, glabrous with strigillose margin and midvein, base attenuate to narrowly cuneate, margin weakly denticulate with 3-8 teeth per side, apex acute or obtuse. Inflorescence slightly nodding before anthesis; flowers erect. Sepals 2.5-3.2 mm. Petals white or pink, rarely rose-purple, 3-5 mm. Stigma capitate to broadly clavate, entire. Capsules 2.3-5 cm, glabrescent or sparsely strigillose; pedicels 0.8-2.2 cm. Seeds brown, 0.8-0.9 mm, coarsely papillose, with inconspicuous chalazal collar; coma dingy white, easily detaching. Fl. Aug-Oct, fr. Sep-Nov. 2n = 36*.

Gansu, Guangxi, Hebei, Henan, Hubei, Qinghai, Shaanxi, Sichuan, Taiwan, Yunnan [Japan, Philippines].

Moist, often disturbed places along streams and rivers in mountains; (400-)1000-2000(-3500) m.

Epilobium cephalostigma Haussknecht var. linearifolium Hisauti; E. formosanum Masamune; E. sohayakiense Koidzumi.