Son La Prov., Van Ho Distr., Xuan Nha Municipality, Muong An village, territory of Xuan Nha natural reserve. Primary broad-leaved evergreen humid forest on very steep slopes and cliffs of remnant mountain composed by solid highly eroded crystalline limestone at elevation 800-1000 m a.s.l. around point 20°45’06.5’’N 104°46’37.8’’E. Tree 5-10 m tall in open place at mountain foothill. Syconia dull green. Common.