FLORA OF VIETNAM Begoniaceae Begonia “arachna” 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. 13 November 2014 CPC 7391 Photos. Coll.: L.Averyanov, N.T.Hiep, N.S.Khang, T.Maisak, L.Osinovetz