Leaf conspicuously petioled; lamina linear-oblong or 
elliptic-oblong to narrowly oblong-lanceolate, acute, 
cuneate below, 14-21.4 em. long, up to 2.9 cm. wide, 
subcoriaceous, with the mid-nerve sulcate above and con- 
spicuously carinate beneath: petiole long, slender, chan- 
nelled, 4-11 em. long. Seapes lateral, basal, several, 
short, slender, lax to erect-ascending, 1-flowered, the pe- 
duncle with the pedicellate ovary up to 14 cm. long; 
peduncle mostly or entirely concealed by several loose 
tubular sheaths which are smaller and imbricated below ; 
pedicellate ovary slender, concealed and slightly exceed- 
ed by a bract similar to the sheaths of the peduncle. 
Flower large, white and lilac-rose, with only slightly 
spreading segments. Dorsal sepal linear-lanceolate, long- 
acuminate, tubular-involute, up to 8.4 em. long and 7.6 
mm. wide across the concave basal part when expanded. 
Lateral sepals narrowly triangular-lanceolate, oblique 
and gently upcurved above, acuminate, adnate to the 
column-foot to form a prominent triangular mentum, up 
to 8.5 em. long and 1 cm. wide at the base. Petals very 
similar to the lateral sepals, gently upeurved with a long- 
acuminate apex, about 2.9 cm. long and 4.5 mm. wide 
below. Lip much shorter than the sepals and_ petals, 
erect, parallel to the column, lightly recurved and up to 
1.95 em. long in natural position with the sides of the 
lower portion erect, deeply 8-lobed near the apex, ses- 
sile, elliptic-oblong in outline, about 6 mm. broad when 
expanded; lateral lobes long and narrow with a short 
ovate-rounded free apex; mid-lobe elliptic-lanceolate, 
obtuse, very fleshy through the middle, suleate above 
and carinate beneath, with strongly undulate margins, 
about 6 mm. long; disc with an oblong-lanceolate sul- 
‘rate callus in the middle, lightly pubescent and ecallose 
in the center near the base. Column short, stout, abrupt- 
ly clavate and lightly arcuate when viewed from the side, 
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