FLORA OF VIETNAM Plants of Nam Xuan Lac Species/Habitat Rubiaceae Ophiorrhiza sp. Bac Kan prov., Cho Don Distr., Ban Thi Municipality, Phia Khao Village, around Lung Trang site, magnolias mts., coordinate ca. 22°17′05″ N, 105°30′51″ E, 855 m, limestone mts. On slopes of logged primary closed evergreen broad-leaved forests with deep soils. Perennial herbs, flowers white