Epilobium royleanum Hausskn.

Herbs perennial, erect or ascending, with fleshy soboles that leave brown basal scales. Stems 10-60 cm tall, well-branched or simple, strigillose and usually glandular pubescent throughout, lacking raised decurrent lines. Petiole 2-7 mm; cauline leaf blade narrowly ovate to lanceolate, sometimes elliptic or oblong-lanceolate, 1.5-5.5(-7) × 0.5-2.5(-3.3) cm, subglabrous with faintly strigillose margin and midvein, base cuneate (subrounded), margin densely serrulate with 10-24 teeth per side, apex acute or subacuminate. Inflorescence and flowers erect. Sepals 3.8-6 mm. Petals pink to rose-purple, 5-7.2 mm. Stigma capitate to broadly clavate, entire. Capsules 3.5-7 cm, strigillose, glandular; pedicels 0.4-1 cm. Seeds light brown, 0.9-1.2 mm, papillose, with short chalazal collar; coma white, detaching easily. Fl. Jul-Sep, fr. Aug-Oct. 2n = 36.

It is a temperate plant. It grows in moist weedy places in valleys and along streams. In China it grows between 1,400-3,300 m above sea level. In Sichuan and Yunnan.

The leaves are cooked as a vegetable. They are also added to tea.