FLORA OF VIETNAM Begoniaceae Begonia rigidifolia Aver., sp.nov. Type
Quang Binh Prov., Tuyen Hoa Distr., Lam Hoa municipality, Chuoi village, around point 17°56′51”N 105°49′18”E.
Primary broadleaved evergreen dry forest on very steep slopes and on tops of rocky ridge composed with highly eroded crystalline limestone at elev. 200-250 m a.s.l.
Lithophytic rosulate herb on shady vertical cliffs. Flowers light pinkish, anther and stigmas yellow, leaves dark to light green with irregular dirty brownish or dark green irregular palmate markings above, light green, nearly white below, with unclear dirty purple marks. Petioles dull brownish-purple. Not rare.