TROPICAL AMERICAN ORCHIDS 
below indicate greater length). Peduncle below the inflores¬ 
cence with about five inconspicuous scarious infundibuliform 
sheaths terminating at their base in a black-banded joint, 
about 1.5 mm. in diameter. Panicle with four to seven 
widely spreading branches which sometimes fork. Floral 
bracts minute, triangular, concave. Flowers small. Lateral 
sepals free, very obliquely obovate, about 6.5 mm. long, 
3.2-3.6 mm. wide, apex rounded and abruptly apiculate, 
gradually narrowed to a subunguiculate base, concave. 
Dorsal sepal obovate-spatulate, about 5.9 mm. long, 3.9 
mm. wide above, acute, strongly concave. Petals obovate- 
oblong, 5.2-5.9 mm. long, 3.15 mm. wide in the middle, 
abruptly and obliquely truncate at the apex with a minute 
apicule, somewhat narrowed toward the base, margins 
rather undulate. Labellum distinctly 3-lobed, 7-7.5 mm. 
long; lateral lobes small, ligulate, retrorse, abruptly sub- 
falcate or nearly straight near the acute or obtuse apex, 
densely and finely pubescent especially above the base; 
middle lobe very abruptly dilated from an isthmus 2-3 mm. 
long into a reniform lamina which is 6.8-7.8 mm. wide, in¬ 
conspicuously bilobed in the middle, and finely and densely 
pubescent; callus basal, large, fleshy, divided into two equal 
portions,—the posterior 3-lobed with the lateral lobes 
largest,—the anterior subquadrate-subtrilobed in outline. 
79 
