Description from Flora of China
Phyteuma japonicum Miquel, Ann. Mus. Bot. Lugduno-Batavi 2: 192. 1866; Campanula japonica (Miquel) Vatke.
Roots fleshy, up to 20 cm, up to 1.5 cm in diam., branched or not. Stems single, erect, more than 60 cm tall, simple or branched above, glabrous or very rarely sparsely hirsute toward base. Lower cauline leaves with petiole up to 4 cm; upper cauline leaves almost sessile; blade ovate, lanceolate, or elliptic from below toward apex, 3-12 × 1.4-5.5 cm, abaxially glabrous, adaxially sparsely puberulent, base cuneate or obtuse, margin serrate, apex acute to acuminate. Flowers glabrous except on filaments and style. Calyx tube globose or campanulate; lobes linear, 4-8 mm. Corolla purple-blue or blue-purple; lobes 8-14 mm. Style 9-15 mm. Capsule globose, base truncate or concave, ca. 5 mm in diam. Seeds yellow to brown, ovoid, ellipsoid, or oblong, ca. 1 mm. Fl. Jul-Aug, fr. Sep. 2n = 28.
Forests, rarely meadows. Heilongjiang (Huachuan), Jilin (E of Jingyu), Liaoning [Japan, Korea, Russia (Far East)].