Gesneriaceae

Petrocodon ainsliifolius W.H. Chen et Y.M. Shui

Thanh Hoa Province, Quan Hoa District, Nam Dong Conservation Area (20°18'82''N 104°53'60''E), primary evergreen mixed and coniferous dense wind-formed forest on rocky mountains tops and ridges, composed of solid marble-like limestone at elevation 900–1100 m a.s.l., herb perennial, flowers purple, very rare, 30 June 2019, Cuong Huu Nguyen, Ly Van Nguyen, Luc Van Le, CLL 514.