FLORA OF VIETNAM
Orchidaceae
Thrixspermum calceolus (Lindl.) Rchb.f.

Hoa Binh Prov., Lac Son Distr., Tu Do Municipality, Mon village, around point 20°24′52”N 105°19′41”E. Secondary evergreen dry broad-leaved forest on steep rocky slopes of remnant mountain composed with highly eroded marble-like solid crystalline limestone at elevation about 300 m a.s.l. Creeping epiphyte. Occasional.
CPC 1392b 23 March 2011
Coll.: L. Averyanov, T.Maisak, N.Q.Hieu, N.T.Hiep, P.K.Loc, P.V.The, N.T.Vinh, T.B.Ngan, N.Tap, D.D.Dao, V.T.Ha.

Fl. under cultivation at 10 June 2014 and 10 May 2016. Flowers very fragrant, light dull yellowish, median lip lobe yellow, at the base with small purple marks. Photos. L. Averyanov.