Quang Binh Prov., Minh Hoa Distr., Thuong Hoa municipality, environs of Mo O O O village, around point 17°39′11.6”N 105°54′53”E.
Primary broad-leaved closed forest on very steep rocky slope of remnant mountain composed with highly eroded solid crystalline limestone at elevation 400-500 m a.s.l.
Treelet to 4 m tall along humid shady stream slope. Flowers yellowish. Very common.
CPC 3686 24 July 2011 Coll.: N.T.Hiep, L.Averyanov, N.S.Khang, N.Q.Vinh.