FLORA OF VIETNAM
Asclepiadaceae
Byttneria sp.

N.Vietnam, Ha Tinh Prov., Huong Son Distr., Son Kim Municipality, Rao
Bun stream around Rao An FPD station at 18°25′18′'N, 105°13′15′'E.
Primary and secondary broad-leaved evergreen closed wet forest on very
steep shale slopes of river canyon at elevation about 200-300 m a.s.l.

Woody vine 8-10 m long. Flowers dull light green, disc brown-purple.
Not rare.

HAL 5138 6 May 2004

Collectors: P.K.Loc, L.Averyanov, P.V.The, N.T.Vinh.