FLORA OF VIETNAM
Begoniaceae
Begonia truncatiloba Irmscher

Ha Giang prov., Quan Ba distr., Tung Vai commune, Thung Pang village, around point 23°04ʹ28.9ʺN 104°55ʹ32.0ʺE, steep rocky slope to large deep cave composed with highly eroded marble-like white limestone at elevation 900–1000 m a.s.l. Secondary evergreen broad-leaved very humid forest with bamboo. Lithophytic herb on rocks in deep cave shady. Leaves dark velvety green, fluorescent with bright blue. Petioles dull reddish. Not common, found only in cave shade. 17 October 2018, L. Averyanov, Nguyen Sinh Khang, T. Maisak, Truong Duc Thieu, VR 935 (HN, LE01049752, LE01049792).