FLORA OF VIETNAM Orchidaceae Polystachya concreta (Jack.) Garay & Sweet.
Quang Tri Prov., Huong Hoa Distr., Huong Viet municipality around point 16°51′06”N 106°34′38”E.
Partially destroyed primary broadleaved evergreen forest on very steep rocky slopes of remnant hills composed with solid highly eroded crystalline limestone at elev. about 600-700 m a.s.l.
Epiphyte on old tree on rocky top of limestone hill. Not common.