FLORA OF VIETNAM
Orchidaceae
Dendrobium williamsonii Rchb.f.

Dien Bien Prov., Muong Cha Distr., Mua Ngai Municipality, around point 21°52′19”N 103°10′01”E.

Remnants of primary evergreen broad-leaved forest on very steep rocky slopes and on tops of remnant mountain composed with highly eroded marble-like solid crystalline limestone at elevation 1150-1250 m a.s.l.

Epiphyte on old mossy trees near top of ridge. Occasional.

CPC 1088c 18 December 2010
Coll.: L.Averyanov, P.K.Loc, P.V.The, N.T.Vinh.

Fl. et coll. under cultivation at 3 March 2011
Flowers with cucumber odor; sepals white with yellow tint toward apices; petals pure white; lip rich orange with white apex of epichile; column white; operculum white; column foot orange; spur dull light orange-pink; pedicel and ovary light green. L.Averyanov. Photos.