trilobatum, columnae adpressum et cum ea in tubum 
adnatum; lobi laterales subdolabriformes, margine irreg- 
ulariterdenticulato ; lobus medius subsimilis,emarginatus 
cum apiculo obtuso interjecto; discus prope apicem 
columnae conspicue bicallosus, per medium leviter cari- 
natus. Columna sectionis. 
Plant 4.5-6 dm. high. Roots whitish, smooth, 
coarsely fibrous. Stems slender, erect, about 4 mm. in 
diameter near the base, concealed by the tubular closely 
appressed sheaths with which the leaves are articulated. 
Leaves numerous, distichous, the lower ones 3—6 cm. 
long and 1 cm. wide, lanceolate, acute, their sheathing 
bases 3.5-5.5 em. long, tinged with violet-purple, the 
upper ones up to 16 cm. long, 1—1.7 em. wide, linear- 
lanceolate, acute, chartaceous when dry, 1.5—2 em. apart 
on the stem. Inflorescence erect, subpaniculate, termi- 
nal, 6.5-12 em. long. Peduncle with the rachis 5.5—11 
em. long, provided with one or more sheathing acute 
scarious bracts. Flowers 5 to7, fleshy. Pedicels about 
8 mm. long, smooth, slender. Bracts of the panicle 
3.5-10mm. long, usually much shorter than the pedicels, 
linear to triangular, strongly coneave. Ovary about 5 
mm. long, smooth. Lateral sepals 10-11 mm. long, 
2.75 mm. wide, oblong, acute, spreading, margins 
strongly revolute. Dorsal sepal similar, 12 mm. long, 
erect. Petals 11-11.5 mm. long, 2-3 mm. wide, spatu- 
late, acute. Labellum distinctly 3-lobed, including the 
basal part that is adnate to the column 11-12 mm. long; 
free portion up to 8 mm. long, 10 mm. wide across the 
lateral lobes, with a more or less clearly defined central 
keel on the upper surface, and with 2 hemispherical 
complanate calli on the dise in front of the apex of the 
column; lateral lobes sub-dolabriform, about 5 mm. 
wide with an irregularly dentate or crenulate margin; 
middle lobe up to 11.5 mm. wide, about 3.5 mm. long, 
9 
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