FLORA OF VIETNAM Begoniaceae Begonia arachna Aver., sp.nov.
Ha Giang Prov., Bac Me Distr., Phieng Luong municipality, around Phieng Luong village.
Primary broad-leaved humid evergreen forest on very steep slopes and along rocky ridge composed with solid crystalline highly eroded limestone at elevation 1100-1150 m a.s.l. around point 22°38′07.1″N 105°19′22.1″E.
Lithophytic rosulate herb on shady vertical cliffs. Flowers light pink to almost white, ant hers and stigma yellow, Fruits purple. Leaves green, dark red-purple below, petioles dull purple. Very common.