Description from Flora of China
Stellaria nemorum Linnaeus var. stubendorfii Regel, Bull. Soc. Imp. Naturalistes Moscou 35(1): 270. 1862.
Herbs perennial. Stems ascending or erect, 50--80 cm tall, simple or branched, with 1 line of multicellular hairs. Leaves ovate, ovate-oblong, or ovate-lanceolate, 4--8 × 2--3(--4 ) cm, both surfaces nearly glabrous, base nearly cordate, rounded, or cuneiform, margin with multicellular hairs, apex acuminate; proximal cauline leaves petiolate, distal leaves sessile. Flowers in terminal cymes; bracts ovate, herbaceous, ciliate. Pedicel 1--3 cm, densely glandular hairy. Sepals 5, narrowly ovate-oblong to ovate-lanceolate, 4--5 mm, with soft hairs, midvein inconspicuous, apex slightly obtuse-acute. Petals 5, slightly longer than sepals, 2-cleft nearly to base. Stamens 10, nearly as long as sepals. Styles 3. Capsule ovoid, slightly longer than persistent sepals, 6-valved. Seeds blackish brown, compressed reniform, ca. 1.2 mm in diam., densely tuberculate. Fl. Apr--Jun, fr. Jul--Aug.
The typical variety differs from var. stubendorfii in its pubescent stems and flowers, ovate sepals, petals 1.5–2 × as long as sepals, and tuberculate seeds.
Mixed woods, grassland slopes; ca. 1500 m. Jilin [Japan, Korea, Russia; Europe].