CENTRAL AMERICAN ORCHIDS 
sepals up to 1.4 cm. long, 4 mm. wide, undulated, brown 
margined with yellow, unguiculate, oblong, obtuse, strongly 
carinate along the median nerve. Dorsal sepal 1.2 cm. 
long, about 5 mm. wide, unguiculate, oblong, acute, undulate, 
ecarinate, colored like the lateral sepals. Petals hardly 
unguiculate, oblong-elliptic, obtuse, 1.4 cm. long, 5 mm. 
wide, undulate. Labellum 1.4 cm. long, 1 cm. wide across 
the base, 1.3 cm. wide across the tip, pandurate, about 4 mm. 
wide near the middle; lateral lobes suborbicular, 2.5 mm. 
wide; middle lobe broadly obreniform or transversely el¬ 
liptical, emarginate, 8 mm. long, bright yellow heavily 
marked with brown on the isthmus. Crest basal, 5-lobed, 
puberulous, four of the lobes in pairs, the fifth one terminal 
and trilobulate, acute, porrect. (In dried specimens each 
member of the basal pair of lobes of the crest has a thickened 
lobule on its upper surface, the members of the anterior 
pair are affixed to the disc of the labellum and confluent with 
the ventral side of the trilobulate terminal lobe which is 
fleshy at the base and produced in front into a rostrate por¬ 
rect tip.) Column 5 mm. long, with dolabriform wings. 
The nearest ally of this species is Oncidium Suttonii 
Batem., which has a different crest on the labellum, some¬ 
what smaller flowers, and the branches of the paniculate 
raceme shorter. In the type specimen of Oncidium Suttonii 
the larger and more characteristic inflorescence has five 
flowers on each branch of the raceme. In 0. Lankesteri there 
are usually six or seven flowers on each branch. While it is 
true that the number of flowers is variable, and not a reliable 
guide to specific difference, it serves, with the other char¬ 
acters described, to make differentiation possible. 
Costa Rica, Irazu Volcano, Slopes in valley of Reven- 
tado, C. H. Lankester & Alfredo Sancho 415. Repulsively 
aromatic after sundown. Sepals and petals brown margined 
with yellow. Labellum bright yellow. 6000 feet altitude. 
(Type in Herb. Ames Nos. 23729, 23730, and 23731); Car- 
tago, C. H. Lankester K339. (Herb. Kew.) 
Chondrorrhyncha estrellensis Ames sp. nov. Herba 
epiphytica, acaulis. Radices elongatae, glabrae, in sicco 
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