FLORA OF VIETNAM
Carlemanniaceae
Sylvianthus tonkinensis

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 and cliffs of Svoi Lap remnant mountain composed with highly eroded solid marble-like limestone at elevation 500-600 m a.s.l.

Terrestrial and lithophytic undershrub to 2 m tall on wet shady rocky valley. Flowers white. Locally very common.

HAL 12723 17 February 2009
Coll.: L.Averyanov, P.K.Loc, N.T.Vinh, L.T.Son.