FLORA OF VIETNAM Polygalaceae Polygala tonkinensis Chodat
Quang Binh Prov., Minh Hoa Distr., Thuong Hoa municipality, around point 17°41′28”N 105°53′42.7”E.
Wet primary evergreen broad-leaved forest on shady humid slope of narrow rocky stream canyon composed with solid crystalline limestone at elevation around 582 m a.s.l.
Undershrub to 1.5 m tall in rather open place. Flowers yellow-green, median tepal purple.