12 
a 
12a. 
12. 
13a. 
14, 
14a, 
7a. 
18a. 
19a. 
20. 
late, and the third in the center originating 
from the base of the lip between the column- 
WINGS: 2 6 oo Se 
Median keel much shorter than the beens ones 
Median keel as long as the lateral ones . 
Column slender; clinandrium low, 
clinandrium high, cucullate 
Column stout; 
Flowers rather small: lip when expanded 
distinctly pandurate, i.e., 
middle; midlobe of lip truncate to cuneate 
OCDASE 4 ce Se ee Ee 
Flowers medium to large, lip when expanded 
never pandurate, but constricted above the 
middle; midlobe of lip transversely reniform, 
constricted in 
deeply cordate at base . 
Lip when flattened truncate to subcordate at 
BOR % ee & 6 4 Re eS ee ee eS 
Lip when flattened cuneate at base 
Midlobe of lip sessile, transversely elliptic 
to cordate-reniform ew we ee 
Midlobe of lip cuneate to cuneate-flabellate 
Sepals and petals conspicuously muricate- 
papillose dorsally, especially towards base; 
petals distinctly mucronate at the more or 
less emarginate apex... ae ae 
Sepals and petals glabrous ee oe petals 
neither mucronate nor emarginate at apex 
Lateral lobes of lip ovate-oblong, forming an 
acute to subacuminate, open sinus with 
median lobe; callus large, basally produced 
into a retrorse, conical point . . . . . . . 
Lateral lobes of lip subrotund to obliquely 
obovate with rounded lobes, often imbricating 
the base of median lobe ; callus small without 
a retrorse, conical point . ........ 
Flowers medium size; lip 15-17 mm. long; 
callus quadrate in outline, porrect, composed 
of three ridges . . . . .. ee 
Flowers large: lip 22-24 mm. eee eallus 
transversely rectangular-oblong, distinctly 
curved upwards in front without any ridges 
but slightly depressed. . .....25.-. 
Petals with transverse bars; lateral lobes of 
(140 | 
marginate . 
12 
0. Dayanum 
O. tripterygium 
O. andigenum 
14 
O. sanguinolentum 
O. mimelicum 
O. azuayense 
O. nubigenum 
. O. aequinoctiale 
O. alticola 
O. tarquiense 
