FLORA OF VIETNAM Orchidaceae Phreatia formosana Rolfe ex Hemsl. var. continentalis (Gagnep.) Aver.
Ha Giang Prov., Bac Me Distr., Phieng Luong municipality, around Phieng Day village.
Degraded primary broad-leaved humid evergreen forest along rocky canyon of small stream at the base of mountains composed with solid crystalline highly eroded limestone at elevation 900-1000 m a.s.l. around point 22°38′43.8″N 105°19′19.8″E.