FLORA OF VIETNAM Orchidaceae Arundina caespitosa Aver. Type
Vietnam, Thua Thien – Hue Prov., A Luoi Distr., Huong Nguyen Municipality, in vicinities of Tra Ve forest protection station, around point 16°15′16′'N, 107°26′57′'E at elevation about 80 m a.s.l.
Open riparian shrubs along rocky Tra Ve river valley on sandstone and granite outcrops.
Lithophytic herb up to 0.4 m tall in crevices of wet rocky waterfall cliffs. Flowers purple, lip with white center. Very rare.