Ha Giang prov., Quan Ba distr., Tung Vai commune, Lung Kho village, around point 23°02ʹ55.0ʺN 104°56ʹ01.4ʺE, steep rocky slopes near hill top composed with stratified highly eroded limestone at elevation 900–980 m a.s.l. Remnants of primary evergreen broad-leaved very humid forest. Giant herb with leaves 4–5 m tall in open wet place. Common. 18 October 2018, L. Averyanov, Nguyen Sinh Khang, T. Maisak, Truong Duc Thieu, VR 962 (HN, LE01054153, LE01054154).