Description from
Flora of China
Melampyrum ovalifolium Nakai, Bot. Mag. (Tokyo) 23: 6. 1909.
Leaf blade narrowly ovate, base shallowly cordate, rounded, or broadly cuneate, apex acuminate. Bract margins with long setoselike teeth, apex acuminate to narrowly acuminate. Flowers crowded. Calyx lobes narrowly acuminate to caudate. Fl. Jun-Aug.
Open slopes; below 900 m. Zhejiang (Tianmu Shan, Tiantai Shan) [W Japan, Korea].