nosum, canaliculatum, dorso carinatum. Sepala lateralia 
lineari-oblanceolata, acuta vel acuminata, faleata, canal- 
iculata, dorso carinata. Petala linearia vel oblanceolata, 
acuta vel acuminata, obliqua, dorso carinata. Labellum 
erecto-patulum, in positu naturali supra medium arcuato- 
decurvatum, in laminam lineari-spathulatam expansum, 
acutum, canaliculatum, dorso carinatum; discus bicallo- 
sus, calli intramarginales lineares. Columna clavellata. 
Capsula cylindracea. 
Plant simple, tall, stout, erect, up to 2 meters high, 
leaf-sheaths peduncles and lower surface of the young 
leaves usually lepidote with brownish scales. Stem terete, 
occasionally geniculate at the base. Leaves large, crowded 
on the upper part of the stem, elliptic-lanceolate to nar- 
rowly lanceolate, long-acuminate, distichous, sessile, pli- 
cate and conspicuously many-nerved, 15-45 cm. long, 
3-7.5 ecm. wide. Inflorescences one to three lax corym- 
bose panicles, arising in the axils of the uppermost leaves, 
up to 12 cm. long; peduncle slender, usually somewhat 
lepidote, up to 8.5 em. long. Floral bracts ovate-trian- 
gular to lanceolate, acute to acuminate, concave and 
clasping at the base, 3-18 mm. long, 2-8 mm. wide near 
the base, those subtending the branches of the inflores- 
cence longest. Flowers greenish white or white, arcuate, 
spreading. Sepals canaliculate, fleshy-thickened, conspic- 
uously dorsally carinate along the mid-nerve; dorsal sepal 
linear to linear-oblanceolate, acute or shortly acuminate, 
incurved, 12-19 mm. long, 2—-2.5 mm. wide above the 
middle; lateral sepals linear-oblanceolate, acute or abrupt- 
ly and shortly acuminate, in natural position prominently 
faleate-recurved, 10-15 mm. long, 2—2.5 mm. wide above 
the middle. Petals obliquely linear to oblanceolate, acute 
or abruptly and shortly acuminate, somewhat dilated and 
concave at the apex with the margins crisped, thinner 
than the sepals, conspicuously dorsally carinate along the 
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