N. Viet Nam. Ha Giang Province, Quang Ba District, at Sin Suoi Ho village on east side of Sin Suoi Ho river. Degraded forest along north slope and along ridge, exposed limestone rock outcrops at elev. about 1100 m (23°07′N 105°02′E). Lithophyte on flanks of rocks at ridgetop. Pedicels green, corolla all light clear orange. Occasionally. DKH 5010 3 April 2000