The plants are rather small with aggregate or approxi- 
mate ovoid to pyriform and slightly compressed pseudo- 
bulbs which are enveloped by several imbricating sheaths 
of which the uppermost may be leaf-bearing. The one or 
more terminal leaves are linear to elliptical or narrowly 
lanceolate and subcoriaceous. The inflorescence, fre- 
quently precocious, emerges laterally from the basal 
bracts and is usually slender, arching, few-flowered, and 
racemose; occasionally it is rigid and erect, or many- 
Howered and paniculate, often conspicuously fractiflex. 
Key to Species 
Part of callus enclosed by the auriculate base 
of column adorned with a tuft of hairs . . . . . . . . . 2 
_ 
la. Part of callus enclosed by the auriculate base 
of column without a tuft of hairs . . . . . . . . 2. +. . 158 
8 Inflorescence rigid, erect, with more or less 
flexuous rachis . . . 0.0.0. ee ee ee ee SB 
Ya. Inflorescence flaccid, arcuate with sinuous 
PCN a ke RRS es ee RO eS ee 
3. Column with erect clinandrium, callus of lip 
keel-like, one-fourth to one-sixth of entire 
length of lip, triangular in lateral view, with 
a small, divaricately spreading lobe resembling 
nostrils on each side « « 6% 6 @ 6 se eee ee we & 
3a, Column with dorsally reclining clinandrium ; 
callus of lip keel-like, one-third of entire 
length of lip, triangular in lateral view consist- 
ing of three, parallel, distinct ridges of which 
the median is longer and nose-like without 
small spreading lobes on each side. . . . . 2. 2. 2 we OD 
4, Inflorescence racemose, rarely with a few short 
branches; sepals at least 16 mm. long; lip 30 
mm. long... 0... ee ee ee ee ee OF olivaceum 
var. olivaceum 
4a, Inflorescence paniculate with numerous, long, 
diffused branches; sepals up to 10 mm. long; 
lip up to20mm.long. . . . . . . 2 2. . . OW olivaceum 
var. giganteum 
[ 138 ] 
