FLORA OF VIETNAM
Acanthaceae Phu Tho Prov., Tan Son Distr., Xuan Son Municipality, Du village, around point 21°02′55”N 104°56′51”E.

Primary broad-leaved forest on very steep rocky slopes of remnant mountain composed with highly eroded solid marble-like limestone at elevation 400-500 m a.s.l.

Terrestrial herb in wet shady place along rocky stream canyon. Flowers white. Not common.

HAL 12727 17 February 2009
Coll.: L.Averyanov, P.K.Loc, N.T.Vinh, L.T.Son.