TROPICAL AMERICAN ORCHIDS 
slightly spreading. Lateral sepals narrowly triangular- 
lanceolate, 2.04 cm. long, about 7.2 mm. wide at the oblique 
base (measured along the column-foot), abruptly acute at 
the very apex, many-nerved, forming with the column-foot 
a prominent mentum which is about 7 mm. long. Dorsal 
sepal similar, triangular-ligulate, about 2 cm. long, 4.9 mm. 
wide near the base, acutish, concave below. Petals similar 
to the lateral sepals but smaller, lanceolate, about 1.8 cm. 
long, 3.7 mm. wide below, obliquely inserted on the col¬ 
umn. Labellum relatively small, in natural position erect 
with its sides upcurving, when expanded obovate-oblong in 
outline, sharply 3-lobed near the apex, 1.21 cm. long, 6 mm. 
wide near the apex, in the middle a fleshy Ungulate sulcate 
callus which extends in two lines toward the base; lateral 
lobes semiobovate, broadly rounded with irregular margins 
above; terminal lobe suborbicular-quadrate, about 2.6 mm. 
long and a little broader, with a large fleshy thickening in 
the centre of the under surface. Column extended into a long 
foot; free part very short and stout, about 4 mm. long, a 
short narrow fimbriate-lacerate wing at the summit. 
Maxillaria confusa has several very close allies. It has 
considerably smaller flowers than and somewhat different 
lip characters from M. pachyacron Schltr., which appears 
doubtfully separable (differing apparently only in absence of 
papillae on the lip) from M. Reichenheimiana Endres & 
Reichb. f. It also has flowers which are different in color 
from those of M. Reichenheimiana. From M. ringens 
Reichb. f. (in which species the flowers are similar in size to 
those of M. pachyacron and M. Reichenheimiana) M. confusa 
is distinguishable by its smaller flowers, long mentum, 
shorter callus on the lip, and by its lacerate-margined an- 
droclinium. 
Costa Rica, Peralta, C. H. Lankester 908, June 25, 
1924. Flower white. Common in forest zone of the Atlantic 
slope. (Type in Herb. Ames No. 28689.) 
Maxillaria diuturna A. & S. sp. nov. Herba caulescens, 
cauli vaginis distichis imbricantibus dense obtecto. Pseudo- 
bulbi monophylli, in sicco ancipites. Folia oblongo-elliptica. 
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