Unknown family 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 Undershrub, 1-1.5 m tall; flowers white; fruits with two "sung", opened. "Chiu dong nuoc chay xiet"