Tuyen Quang Prov., Na Hang Distr., Sinh Long Municipality, central of Nam Duong Vill., around point 22 35′07″ N, 105 22′14″ E, 344 m In completely logged closed primary evergreen broad-leaved lowland forests on stream banks and on rocks in middle of limestone streams Prostrate undershrub. "Chiu dong nuoc chay xiet"