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 of limestone areas. Shoots regenerated from cut trunk, ca. 2-3 m tall; bud scales long, to 8-10 cm, hairy outside