FLORA OF VIETNAM Menispermaceae Stephania longa Lour.
Quang Binh Prov., Minh Hoa Distr., Thuong Hoa Comm., Ban On Vill., Con Moong mt. (about 1 km N on walking trail from Ban On to Thuong Hoa), 17°40′59″N, 105°57′56″E, 250-280 m.
On vertical cliffs, edges of heavily logged primary and secondary closed evergreen broad-leaved forests and woodlands on foot of limestone mts. Perennial herbaceous vine, up to 4-7 m long. Rare.