N. Viet Nam. Ha Giang Province, Quang Ba District, at Sin Suoi Ho village and river. Degraded agricultural land among limestone rocks to ridgetop of exposed limestone under light canopy with many epiphytes and lithophytes on north and east facing slopes, at 23°06′57″N, 105°01′48″E, at 514-900 m. In deep shade, among rocks. Inflorescence stalk with white hairs, young fruit dull green, calyx light cream-green with white hairs, corolla white. Occasional.