ORCHIDACEAE QUAEDAM AMERICANAE 
the base, 1.8 mm. long, ovate-acute, 3-nerved, greenish 
yellow. Dorsal sepal 2 mm. long, similar to the laterals. 
Petals about as long as the labellum, 1-nerved, flabellate, 
with a rounded apex, apical margin much thickened. 
Labellum .6 mm. long, basal half quadrate, much thick¬ 
ened by a large callus which is truncate in front; apical 
half triangular-trulliform, acute, concave, membranaceous. 
Column stout, with a large, rounded lobe on each side at 
the apex. 
Allied to Stelis Trianae Schltr., but separable from it by 
the obtusely angled petals and acute labellum. 
Colombia, State of Cauca, Headwaters of Rio Lopez, 
Rio Palo basin, Tierra Adentro, H. Pittier 1061, January 
1906. Flowers greenish yellow. 2500-3000 meters altitude. 
(Type in U. S. Nat. Herb. No. 531263.) 
Pleurothallis araguensis Ames sp. nov. Caules 
secundarii elongati, rigidi, monophylli. Folium oblongo- 
ellipticum. Flores inter se distantes in racemo laxo dis- 
positi. Sepala lateralia usque ad apicem cohaerentia. Se- 
palum dorsale ovatum, lanceolatum. Petala incrassata, 
lanceolata. Labellum in circuitu suborbiculare, bicallosum. 
Roots coarse, 2 mm. thick, whitish, fasciculate. Sec¬ 
ondary stems about 22 cm. long, 2.5 mm. in diameter, bi- 
vaginate; sheaths about 3 cm. long, closely oppressed. Leaf 
about 15 cm. long, 3 cm. wide near the middle, oblong- 
elliptic, gradually tapering toward the base, subacute, 
coriaceous, nervose when dry. Peduncle slender, with the 
few-flowered raceme 5-10 cm. long, arising from a rigid 
complanate sheath. Flowers 2 cm. apart. Pedicel and 
ovary 5-10 mm. long, subtended by a slender, loosely op¬ 
pressed infundibuliform bract which is about 5 mm. long. 
Flowers greenish purple, with purple longitudinal stripes. 
Lateral sepals coherent to the tip, forming an ovate lamina 
1 cm. long, about 7 mm. wide, 6-nerved; nerves purplish. 
Dorsal sepal 1 cm. long, about 5 mm. wide, ovate-lanceolate, 
acute, 3-nerved. Petals 7 mm. long, narrowly lanceolate, 
very fleshy, apex thickened, 3-nerved. Labellum 4.7 mm. 
long, suborbicular when spread flat, acute, sharply deflexed 
