TROPICAL AMERICAN ORCHIDS 
to an obliquely bilobed apex with a minute apicule between 
the lobes, mid-nerve sulcate above and markedly carinate 
beneath, slightly narrowed below to a complicate base in the 
dried specimen; the younger leaves (on the branches) small 
to minute, 2-26 mm. long, 4-8.5 mm. wide. Inflorescences 
single, 1-flowered, in the axils of sheaths. Peduncles about 
3.5 cm. long, with two loose inflated tubular sheaths. Pedi¬ 
cellate ovary concealed and surpassed by a loose condupli- 
cate sheath which is 12.5 mm. long. Perianth segments 
apparently spreading. Lateral sepals oblanceolate-oblong, 
acute on account of a dorsal mucro, 1.7 cm. long, 6mm. wide, 
lightly oblique, very slightly narrowed toward the base, 11- 
nerved (five nerves being more prominent). Dorsal sepal 
elliptic-oblong, about 1.7 cm. long and 5.8 mm. wide, acute 
with a very conspicuous dorsal mucro which terminates an 
apical keel, 7-nerved with several additional inconspicuous 
nerves. Petals oblong-oblanceolate, about 1.46 cm. long, 
5 mm. wide above the middle, acute, 5-nerved. Labellum 
distinctly shorter than the sepals, 1.2 cm. long,3-lobed, with 
the sides ereet and apparently conduplicate in natural po¬ 
sition; lamina (when expanded) pandurate in outline, about 
8 mm. wide across the lateral lobes; lateral lobes small, sub- 
orbicular, gradually narrowed toward the base, contracted 
between them by a fleshy subbilobed transverse callus; 
middle lobe suborbicular, about 7.1 mm. wide, abruptly 
dilated from a short broad isthmus, a deep keel beneath 
especially conspicuous near the apex, margin irregularly 
crenulate. Column short, stout, arcuate, about 4 mm. 
long dorsally. 
Other imperfect flowers have smaller floral dimensions. 
Maxillaria vagans has the habit of M. alba Lindl. 
Panama, Province of Chiriqui, “Palo Alto,” C. W. 
Powell348, November 1923. 4500-5000 feet altitude. “Grows 
in straggling bunches in considerable sunlight. Flowers 
white, labellum edged with pink, side lobe pink.” (Type 
in Herb. Ames No. 27460.) 
Ornithidium conduplicatum A. & S. sp. nov. Herba 
crassa. Pseudobulbi magni, ovoidei, monophylli, rugosi. 
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