Ha Giang prov., Quan Ba distr., Cao Ma Po commune, Chin Chu Lin village, around point 23°05ʹ13.5ʺN 104°48ʹ30.2ʺE, rocky outcrops on steep rocky slopes composed with eroded karstic limestone at elevation 1750–1950 m a.s.l. Highly degraded remnants of primary evergreen broad-leaved very humid forest and evergreen secondary shrubs. Treelet 4-5 m tall on steep rocky slope. Flowers buds dull greenish. Occasional. 20 October 2018, L. Averyanov, Nguyen Sinh Khang, T. Maisak, Truong Duc Thieu, VR 1054 (HN, LE01054624).