ceteris multo majus, panduratum vel trilobatum; lobi 
laterales semiovato-triangulares cum angulis exterioribus 
late rotundatis; lobus anterior reniformi-flabelliformis, 
apice latissime rotundato emarginatus; discus callo bi- 
seriato, basi cuneato, crasse pluridentato ornatus, cum 
parte apicali conspicue tridentata. Columna parva, cum 
alis latis, subquadratis superne ornata et crassificatione 
divaricatim bilobata inferne praedita. 
Plant large, sprawling, very variable, terrestrial or 
climbing. Rhizome stem-like, more or less stout, simple 
or virgately branched at one of the nodes, entirely con- 
cealed by close, tubular, scarious, evanescent sheaths, 
occasionally producing at remote intervals long, simple, 
fibrous roots. Pseudobulbs about 3-13 cm. apart, cylin- 
dric to narrowly pyriform, commonly 2- (rarely 3-) leaved 
near the summit, about 2-6.4 cm. long, provided below 
with several narrow, scarious, evanescent sheaths of which 
one is produced into an oblong-lanceolate blade. Leaves 
lanceolate to narrowly oblong-lanceolate or narrowly 
elliptic-lanceolate, acute and apiculate, papyraceous, 4— 
14.6 cm. long, up to 1.6 em. wide. Inflorescences much 
surpassing the leaves, arising from the base of the pseudo- 
bulb, very loosely paniculate above, about 44.5-117.5 
cm. long, suberect, often diffuse above; peduncle pro- 
vided with several remote, small, inconspicuous sheaths, 
up to 73.5 cm. long; rachis more or less fractiflex with 
the horizontal or decurved branches loosely 8- to 7- 
flowered above. Flowers small, with widespreading seg- 
ments, pale greenish or cream-colored to pale yellow with 
irregular brownish or purple bands. Dorsal sepal shortly 
and narrowly clawed, oblong-ovate or oblong-oval, acute 
to rounded at the apex, 8-nerved, about 6—6.8 mm. long 
and 3.2—4.5 mm. wide. Lateral sepals obliquely obovate- 
oblong or oblong-oblanceolate, rounded to acute at the 
apex, 4-nerved, narrowed to an indistinctly clawed base, 
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