FLORA OF VIETNAM
Carlemanniaceae
Sylvianthus tonkinensis ? Hoa Binh Prov., Lac Son Distr., Ngoc Son Municipality, Khu Village, Ngoc Rac Mt., around point 20°27′15”N 105°19′37”E.

In wet secondary scrub near heavily logged closed primary and secondary evergreen broad-leaved forest foot of shale mts., at elevation about 600-650 m a.s.l.

Undershrub, 2-3 m tall. Flowers white-reddish. Occasion common.

CPC 1676 28 March 2011 Coll.: N.Q.Hieu, L.Averyanov, N.T.Hiep, P.K.Loc, P.V.The, N.T.Vinh, T.B.Ngan, N.Tap, D.D.Dao, V.T.Ha.