18.5 cm. or less high. Roots fibrous, filiform, glabrous, 
very numerous. Rhizome abbreviated (incomplete in our 
specimen). Stems caespitose, slender, 1-leaved at the 
apex, about 4.7—9.5 cm. long, provided with two or three 
very close tubular sheaths of which the uppermost is 
elongate and separated from the other sheaths. Leaf 
erect-ascending, long-petioled, 5.7—10.3 cm. long; lamina 
narrowly elliptic, acute with a sharply tridenticulate 
apex, cuneate below, chartaceous, long-petioled, about 
4.5-7 cm. long, 9-15 mm. wide; petiole slender, chan- 
nelled, up to 2.5 cm. long. Racemes apparently always 
two to each stem, axillary, more or less shorter than the 
leaf, erect to diffuse, loosely several- to many-flowered, 
about 8.6 cm. or less long, subtended by a long slender 
long-acuminate spathe. Floral bracts small, infundibuli- 
form, acute or apiculate. Flowers small, glabrous, mem- 
branaceous. Sepals connate near the base, concave, 3- 
nerved. Dorsal sepal elliptic-ovate, acute, about 8 mm. 
long and 1.6—1.9 mm. wide. Lateral sepals round-ovate, 
obtuse to subacute, about 2.5 mm. long and 1.75—2 mm. 
wide. Petals much smaller than the sepals, rhombic, 
fleshy-thickened above, strongly obtuse or rounded, 
about 0.75 mm. long and subequally wide, 1-nerved. 
Lip about equaling the petals, ovate, cordate at base, 
rounded at the apex, about 0.75—-0.9 mm. long and 0.6- 
0.75 mm. wide; disc mostly occupied by a large fleshy 
sulcate thickening. Column small, dilated above, a little 
shorter than the petals. 
This species is apparently allied to the Venezuelan 
Stes philargyrus Reichb.f., but lacks the apiculate se- 
pals and tridentate lip of that species. 
Cuzco: Proy. of Paucartambo, “‘laderas de Pillahuata, ceja de la 
montafia,’’ at 3000 meters altitude, epiphytic in rain-forest, perianth 
yellow, October 12, 1943, C. Vargas 3665 (Tyrer in Herb. Ames No. 
65208). 
[13 ] 
