mm. long and 2mm. wide. Lip subequaling the petals, 
ovate to rhombic-ovate, obtuse, with upcurved sides, 
about 1.25 mm. long and equally wide in natural posi- 
tion; disc mostly occupied by a large transverse fleshy 
deeply bilobed callus. Column minute, strongly dilated 
upward. 
This species appears to be allied to Stelis flacca 
Reichb.f., but differs in having a prominent rhizome 
and a dissimilar lip. 
Cuzco: Prov. of Quispicanchis, Cachubamba, Marcapata, at 2800 
meters altitude, epiphyte in forest, December 12, 1943, C. Vargas 
3816 (Type in Herb. Ames No. 65251). 
Stelis gracilispica C. Schweinfurth sp. nov. 
Herba mediocris, gracilis, caespitosa. Caules numerosi, 
approximati, vaginis duabus vel quattuor tubulatis arctis 
tecti. Folium unicum, erectum, conspicue petiolatum; 
lamina elliptico-oblonga, acuta vel obtusa, infra cuneata. 
Racemi unici vel duo, folium saepissime valde superantes, 
dense multiflori. Flores perparvi, bilabiati, secundi, sub- 
membranacei. Sepala trinervia. Sepalum dorsale elliptico- 
ovatum, subacutum vel obtusum. Sepala lateralia in lam- 
inam valde concavam bidentatam connata, cum sepalo 
utroque quam sepalo dorsali paulo minore. Petala multo 
minora, transverse rhombico-suborbicularia. Labellum 
petalis minus, transverse obovato-rhombicum, callo trans- 
verso carnoso bilobato ornatum. Columna generis. 
Plant medium-sized, slender, caespitose, about 23 cm. 
or less high. Roots fibrous, filiform, glabrous, very nu- 
merous. Stems numerous, approximate, suberect, slen- 
der, about 4-9 em. high, clothed with two to four sheaths 
which are close tubular and maculate, the uppermost 
being separated and much the longest. Leaf solitary, 
erect, distinctly petioled, 6-7.2 cm. long; lamina elliptic- 
oblong (often narrowly so), acute to obtuse or rounded 
with a minutely tridenticulate apex, cuneate at base, 
Ltr 
