S. Vietnam, Khanh Hoa province, Hon Ba nature reserve, Hon Ba Mountain, around point 12?06?658N 108?56?394E,evergreen mountain forest at elev. about 1467 m a.s.l., lithophyte along the stream, flowering time: January, February (less flower), May, June, 2015, Truong Ba Vuong, BV 130 / AL 86.