TROPICAL AMERICAN ORCHIDS 
2.5 mm. wide, conspicuously complicate-acute, dorsally car¬ 
inate (only near the tip), 3-nerved. Petals broader, oblong- 
lanceolate, 10-11.5 mm. long, 3.4-3.8 mm. wide, conspicu¬ 
ously complicate-acute and dorsally carinate at the apex, 
5-nerved. Labellum pandurate in outline, 9.5 mm. long, 
5.2-6 mm. wide near the base, about 6.8 mm. wide across 
the anterior third; basal portion quadrate-triangular, with 
a rounded subcuneate base, then gradually constricted; an¬ 
terior portion abruptly dilated, transversely oval, broadly 
rounded in front with an abrupt apicule from the dorsal 
keel which is at the apex. Disc with a fleshy indistinctly 
tricarinate callus at the base, often with a shorter keel on 
each side. Column short, about 5 mm. long at the back 
(longer in front), wingless, but with a pair of conspicuous 
shallowly-triangular dilations on the anterior basal portion. 
Oncidium panduriforme is apparently without any close 
allies. 
Costa Rica, Cachi, Anasiasio Alfaro s. n., August 16, 
1924. Lip white. (Type in U. S. Nat. Herb. No. 1205933. 
Duplicate Type in Herb. Ames No. 29015.) 
Oncidium teres A. & S. sp. nov. Herba mediocris. 
Radices fibratae. Pseudobulbi subnulli, monophylli. Folium 
longum, teres, canaliculatum. Inflorescentia folio brevior, 
paniculata. Flores flavidi, brunneo signati. Sepala lateralia 
oblique obovata, apiculata. Sepalum dorsale obovato- 
spathulatum, acutum, valde concavum. Petala obovato- 
oblonga, abrupte et late truncata. Labellum trilobatum; 
lobi laterales retrorsi, ligulati; lobus medius unguiculatus, 
abrupte reniformi-dilatatus. Discus basi callo lobato or- 
natus. Columna brachiis binis, oblongis et incurvis. 
Roots fibrous, flexuous, glabrous, numerous. Pseudo¬ 
bulbs minute, monophyllous, 3-3.5 mm. long, 5 mm. or more 
wide. Leaf fleshy, terete, longitudinally channelled or sul- 
cate, about 35.6 cm. long, 1 cm. across before drying, in¬ 
vested at base (together with the pedicel) by several tri¬ 
angular imbricating scarious sheaths the upper of which are 
successively larger. Inflorescence shorter than the leaf, 
paniculate, about 26.5 cm. long (several panicles broken off 
78 
