prominently cucullate clinandrium, while the remainder 
have only a low collar which partially encircles the anther. 
The lip is the most conspicuous part of the flower in 
each species and contributes greatly to the overall size. 
Most species have a variously constricted lip with a well- 
defined isthmus or with a cuneate base to the midlobe 
suggesting a trend toward an isthmus. Otherwise, the 
midlobe is sessile and cordate, precluding an isthmus as 
in O. nubigenum. 
The most important non-floral character within the 
section is found in the inflorescence. Only O. cucullatum, 
O. Kennedyi and O. oltvaceum have a long, erect, rigid 
peduncle with a fractiflex rachis, while all others have a 
flaccid, arcuate peduncle with a sinuously flexuous rachis. 
This character alone is sufficient to separate the three 
species mentioned from the rest in the section. 
Section Cucullata A7vz/. in Pflanzenr. Heft 80: 
128: 1922. 
Type: Oneidium cucullatum Vind). 
The flowers range between 2 to 4 cm. vertically and 
have attractive color patterns. The sepals and petals are 
subsimilar, ovate-oblong, sessile, acute, and often con- 
cave. The color is variable, frequently mottled, often 
solidly colored with a well-defined margin. The lateral 
sepals are variously connate, always shorter than, and 
hidden by, the lip. The lip is conspicuous, usually con- 
stricted in the middle, with or without a well-defined 
isthmus; the side lobes subquadrate to rounded and often 
deflexed. The midlobe is spreading, emarginate, vari- 
ously maculated, occasionally on both sides. The crest 
consists of an odd number of keels or tumors with or 
without a hirsute base. The column is short, glabrous, 
occasionally with a cucullate clinandrium, and a thick- 
ened base; the rostellum is short. 
[ 137 ] 
