TROPICAL AMERICAN ORCHIDS 
with its strongly and abruptly elevated centre extending to 
the mucronate obtusish apex and with a porrect-spreading 
fmger-like tubercle on each side of its very base. Column 
short, finely pubescent above, about 2.8 mm. long, with a 
pair of oblong fleshy incurved shortly-pubescent wings. 
Oncidium teres is closely allied to 0. ascendens Lindl., but 
has smaller flowers, ligulate side lobes of lip, and truncate 
petals. [Fig. 7:1, flower, front view X about 3. 2, labellum 
and column, front view X about 4.] 
Panama, Province of Veraguas, San Francisco, C. W. 
Powell 383, February 1924. 1000 feet altitude. “Grows in 
sunny locations. Flowers yellow trimmed with brown.” 
(Type in Herb. Ames No. 27950.) 
Lockhartia triangulabia A. & S. sp. nov. Caulis 
folds dense imbricantibus omnino obtectus. Folia disticha, 
equitantia, leviter falcata. Inflorescentiae duae ut videtur, 
subapicales, axillares. Sepala lateralia ovalia, mucronata. 
Sepalum dorsale ovatum, mucronatum. Petala oblongo- 
ovata vel oblongo-elliptica, apice rotundata. Labellum in 
circuitu late quadrato-triangulare, quinquelobatum; lobi 
basales triangulari-lanceolati, retrorsi; lobi intermedii breves, 
triangulares; lobus terminalis quadratus, bilobatus. 
Plant more than 25.3 cm. tall (broken off below). Stem 
completely concealed by imbricating leaves and leaf-bases. 
Leaves distichous, equitant, up to 2.7 cm. long on the lower 
edge and 6 mm. wide near the base, lightly falcate-incurved, 
obliquely acute, subcoriaceous; the upper leaves gradually 
smaller and the ten to twelve uppermost suddenly decreasing 
in size (about 11 mm. long, 3.5 mm. wide). Inflorescences 
arising from two of the upper leaf-axils, paniculate. Rachis 
about 1.5 cm. long. Peduncle and pedicels with small cor¬ 
date nervose bracts. Flower small membranaceous when 
dry. Lateral sepals oval, 5.4 mm. long, 3.1 mm. wide, more 
or less oblique, rounded at the apex, 5-nerved, dorsally 
mucronate at the tip. Dorsal sepal ovate, 5.4 mm. long, 
about 3 mm. wide below, dorsally mucronate at the tip, 4- 
nerved. Petals oblong-ovate, about 5.4 mm. long, 3 mm. 
wide, narrowed toward the base, broadly rounded at the 
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