TROPICAL AMERICAN ORCHIDS 
Maxillaria albiflora A. & 5. sp. nov. Herba caes- 
pitosa. Pseudobulbi monophylli, anguste pyriformes, cur- 
vati, vaginis imbricantibus inclusi. Folia longe petiolata; 
lamina oblonga, acuta, basi cuneata. Pedunculus uni- 
florus, vaginis laxis obtectus. Flos grandis. Sepala later- 
alia longe lanceolato-triangularia, acuminata, obliqua. Se- 
palum dorsale lanceolatum, concavum. Petala sepalo dor¬ 
sad similia, minora. Labellum ovatum, unicallosum, medio 
incrassatum. 
Plant caespitose. Roots fibrous, flexuous, smooth and 
shining in the dried state. Pseudobulbs monophyllous, about 
4 cm. or less tall, narrowly arcuate-pyriform, complanate in 
the dried state, apparently finely rugose-striate, invested by 
distichous imbricating sheaths, the uppermost often leaf¬ 
bearing. Leaves very long petioled; petiole of the leaf on the 
pseudobulb about 8-11.5 cm. long (the petiole of the leaf 
borne on the sheath much shorter), conduplicate, channelled; 
blade oblong, about 16.7 (sheath-leaf) -28.4 cm. long, 2.85- 
4.1 cm. wide, acute, cuneate-narrowed below, many-nerved, 
the mid-nerve carinate beneath. Peduncle 1-flowered, ap¬ 
proximate to the base of the pseudobulb, about 5.6-7.5 
cm. long, concealed by loose scarious sheaths which are 
short and closely imbricating at the base and are longer and 
slightly imbricating above. Pedicellate ovary about 1.5 cm. 
long, exceeded by a concave scarious sheathing bract which 
is about 2.7 cm. long. Flower large, white, with spreading 
many-nerved perianth segments. Lateral sepals lanceolate- 
triangular, 3.05 cm. long, about 1 cm. wide at the base, long- 
acuminate, acute, with a short mucro from a dorsal sub- 
apical keel, oblique at the base. Dorsal sepal lanceolate, 
about 2.9 cm. long, 8.5 mm. wide near the base, long- 
acuminate, with a minute dorsal mucro, concave or navicu¬ 
lar. Petals similar to the dorsal sepal, about 2.55 cm. long, 
about 7 mm. wide in the middle. Labellum shorter than the 
other segments, simple or subsimple, in natural position re¬ 
curved, its sides contracted by a fleshy trilobulate median 
callus, about 1.65 cm. long; lamina ovate, 1.05 cm. wide near 
the base when expanded, rounded at the apex, which is 
minutely retuse, anterior margin denticulate-erose, entire 
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