Description from Flora of China
Coriaria japonica A. Gray subsp. intermedia (Matsumura) T. C. Huang; C. summicola Hayata.
Shrubs small, 1-2 m tall, much branched; branchlets purplish red, 4-angled, lenticular-lenticellate; bud scales ovate, 2-3 mm, membranous. Leaves opposite; petiole to 1-2 mm, inflated into pad at base; leaf blade ovate-lanceolate, (2.5-)3.5-6.5(-7) × (1-)1.3-2.2(-3) cm, membranous or papery, both surfaces glabrous, 3-veined to apex, veins raised abaxially, slightly impressed adaxially, lateral veins slightly impressed adaxially, base broadly cuneate or subrounded, margin entire, apex acuminate. Raceme axillary, 2-4 cm, with numerous triangular bud scales at base. Pedicel 2-3 mm. Sepals ovate-orbicular, ca. 2.5 × 2 mm, margin fringed denticulate at apex, apex obtuse. Petals linear-oblong, small, 0.5-1 × ca. 0.5 mm. Filaments linear, ca. 5 mm, inflexed; anthers linear-oblong, ca. 2.5 mm. Female flowers with or without sterile stamens; carpels 5, laterally compressed, auriculate, ca. 0.7 × 0.5 mm, adaxially ± united at middle part; styles erect, ca. 1 mm; stigma pink, ca. 1.5 mm. Fruit red when mature, globose, 3-4 mm in diam. Fl. Jan-Apr, fr. May-Nov. 2n = 40.
Forests, thickets; below 2500 m. Taiwan [Philippines].