TROPICAL AMERICAN ORCHIDS 
acuminate, rather fleshy, 3-nerved. Petals obliquely lanceo¬ 
late-oblong, 1.15-1.32 cm. long, 2.6 mm. wide, acuminate, 
3-nerved. Labellum elliptic-lanceolate with the upper por¬ 
tion recurved, 1-1.1 cm. long, about 4.5 mm. wide across the 
middle, complicate-acute at the apex, dorsally carinate at 
the tip. Disc,—on its lower half,—with a pair of approxi¬ 
mate high fleshy pubescent keels whieh are about 5 mm. 
long; near the apex of each keel there is an outwardly- 
leaning tooth. Column short, stout, about 5 mm. high at 
the back, toward its base with a pair of broad porrect 
semiovate wings which surround the base of the lip-keels. 
Brassia parviflora is a close ally of B. chlorops Reichb. 
f., judging by the description of the latter. It is separable, 
however, in that the peduncles are much shorter than the 
leaves and the prominent floral bracts much surpass the 
pedieellate ovaries. 
Costa Rica, Cascajal, Anastasia Alfaro s. n., October 
24, 1924. 1700 metres altitude. Flowers green with dark 
spots. (Type in Herb. Ames No. 29010.) 
Oncidium ebrachiatum A. & S. sp. nov. Planta 
mediocris. Pseudobulbi minuti, monophylli. Folia teretia, 
canaliculata. Inflorescentia laxe paniculata, quam folium 
brevior. Flores flavi. Sepala lateralia oblique obovata, 
obtusa. Sepalum dorsale suborbiculare, valde concavum, 
apice rotundatum. Petala oblonga vel obovato-oblonga, 
apice valde truneata. Labellum trilobatum, lobi laterales 
oblongi, apiee falcato in isthmum sensim angustatum; lobus 
medius flabellato-reniformis, profunde bilobatus; discus basi 
quadricallosus. Columna ebrachiata. 
Roots fibrous, numerous, longitudinally sulcate when 
dry, minutely puberulent. Pseudobulbs minute, mono- 
phyllous, concealed by sheaths, about 5 mm. long and 6.5 
mm. in diameter. Leaf terete and longitudinally grooved, 4.1 
dm. or more long, 8-10 mm. wide in the dried state, base 
(together with the peduncle) clasped by several imbricating 
fibrous sheaths. Infloreseence flexuose-erect, loosely pan¬ 
iculate, shorter than the leaf, about 34 cm. long. Peduncle 
glabrous, with five small scarious tubular sheaths which ter- 
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