neate below, marginate, chartaceous, with the mid-nerve 
prominently exserted beneath, about 2.3-3.8 cm. long 
and 6-9 mm. wide. Racemes one to three, erect or nearly 
so, conspicuously surpassing the leaf, up to 10 cm. long, 
many-flowered, densely flowered above. Floral bracts 
small, shallowly infundibuliform, acute or apiculate. 
Flowers very small, membranaceous, dull yellow, gla- 
brous. Sepals connate at the base, prominently 3-nerved. 
Dorsal sepal ovate, acute, about 2.5 mm. long and 1.5 
mm. wide. Lateral sepals suborbicular-ovate, lightly 
oblique, subacute, about 2.1 mm. long and 1.75 mm. 
wide. Petals much smaller, transversely oval, broadly 
rounded and fleshy-thickened above, 3-nerved, about 0.5 
mm. long and 1 mm. wide. Lip about equally long with 
the petals, transversely ovate, subcordate on each side of 
the sessile base, broadly rounded in front, about 0.5 mm. 
or more long and 0.75 mm. wide; disc with a prominent 
fleshy transverse bilobed keel near the base. Column 
minute, characteristic of the genus. 
This species resembles the Central American Stelis 
parvula Lindl., but differs in having less conspicuous 
floral bracts, a narrower dorsal sepal and a smaller lip. 
Puno: Prov. of Carabaya, Ollachea (abajo), at 2500 meters alti- 
tude, December 30, 1947, C. Vargas 6947 (Tyrr in Herb. Ames No. 
65205). 
Stelis ascensor C. Schweinfurth sp. nov. 
Herba mediocris, rhizomatosa. Rhizoma adscendens, 
vaginis tubulatis obtectum. Caules graciles, valde ad- 
scendentes, vaginis tubulatis tribus tecti. Folium petio- 
latum ; lamina saepissime anguste elliptico-oblonga, apice 
acuta, infra cuneata; petiolus gracilis. Racemi unici (raro 
bini), folium multo superantes, subdense multiflori. 
Flores parvi, bilabiati, membranacei. Sepala trinervia. 
Sepalum dorsale elliptico-ovatum, subacutum. Sepala 
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