TROPICAL AMERICAN ORCHIDS 
Inflorescentiae singulae, uniflorae, e bracteariim axillis. Flos 
parvulus. Sepala lateralia ovato-lanceolata, acuta, mentum 
distinctum formantia. Sepalum dorsale simile. Petala 
, ovato-oblonga, acuta. Labellum expansum panduratum, 
parte inferiore anguste elliptica medio callosa, parte ter¬ 
minal! cuneata leviter retusa. Columna in pedem latum 
extensa. 
Plant caulescent. Stem entirely concealed by densely 
imbricating sheaths and leaf-bases which are distichous with 
a membranaceous border. Pseudobulbs monophyllous, ovate- 
oblong in outline, strongly complanate and rugose-striate in 
the dried state, about 2.5 cm. long, about 4 cm. apart, base 
concealed by sheaths and leaf-bases. Leaf oblong-elliptic, 
with a short petioled conduplicate base; blades 5.8-9.7 cm. 
long, 1.3-2.2 cm. wide, apex rounded and minutely bilobu- 
late, coriaceous, with the mid-nerve sulcate above and cari¬ 
nate beneath. Sheaths sometimes leaf-bearing. Flowers 
^ small, campanulate, solitary in the axils of the sheaths. 
Lateral sepals ovate-lanceolate, about 1.22 cm. long, 5.6 
mm. wide near the concave oblique base, acute, 9-nerved, 
forming a distinct short mentum with the column-foot. 
Dorsal sepal similar, concave. Petals ovate-oblong, 1.05 cm. 
long, 5.9 mm. wide below, acute, oblique, 3-5-nerved with 
the lateral nerves branching. Labellum sessile, the sides 
erect and more or less conduplicate in natural position, 
lamina when expanded oblong-pandurate, about 1 cm. long; 
basal portion narrowly elliptic, 4-4.9 mm. wide, with the 
centre occupied by a broad elevated oblong callus; anterior 
portion somewhat cuneate, lightly retuse, about as wide 
across the rounded apex as at the base of the labellum; 
entire disc minutely cellular-papillose. Column arcuate, 
triquetrous in cross section, about 6 mm. long dorsally, ex¬ 
tended into a short broad foot. 
Maxillaria diuturna is an ally of M. chiriquensis Schltr., 
but has broader leaves, broad flattened pseudobulbs, and a 
differently shaped lip. 
' Panama, Cativa-Porto Bello Trail, C. W. Powell 376, 
February 1924. Sea level. Grows in considerable sunlight. 
“• . . . from seed capsules must have been in flower for a 
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