N.Vietnam, Bac Kan Prov., Cho Don Distr., Ban Thi Municipality, Phia Khao village, Cau Muc locality 22°17′32′'N 105°31′27′'E.
Primary closed evergreen wet broadleaved and mixed forest with Pinus kwangtungensis on very steep slopes and cliffs of remnant mountains composed with highly eroded crystalline limestone near the top of ridge at elev. 900-1000 m a.s.l.
Tree 3-5 m hg on tops of ridge. Very common.
HLF 810 26 Dec. 2002.
Coll. Phan Ke Loc, L.Averyanov, Nguyen Anh Duc, To Van Thao, Mai Van Xinh, Nguyen Tien Vinh. Grant from Henry Luce Foundation.