match morphologically with those of §. pardipes, but 
differ in color. The Peruvian collections referred to 5S. 
triseta are noted as having white and dark pink or whitish 
yellow flowers, whereas those of S. pardipes are usually 
described as greenish wine-color, though rarely yellowish. 
It seems apparent that these two concepts cannot be 
upheld as separate species. Stelis triseta is characterized 
by commonly proliferating stems, acute or subacute 
leaves that are short-cuneate at the base, and white and 
pink or whitish yellow flowers. The second concept, here 
designated as var. pardipes, has usually simple stems, 
obtuse leaves that are more or less gradually cuneate at 
the base, and flowers that are usually green or green and 
red to purple. 
Another concept which is surely to be regarded as 
closely related to Stelis triseta is the Ecuadorian Stelis 
pugiunculi Lindl., distinguished by narrower linear or 
linear-lanceolate leaves and acute petals. 
Stelis uninervia C. Schweinfurth sp. nov. 
Herba mediocris, gracilis, saxicola. Rhizoma abbre- 
viatum ut videtur. Caules caespitosi, gracillimi, vaginis 
tubulatis arctissimis obtecti, unifoliati. Folium breviter 
petiolatum; lamina anguste elliptico-oblonga, obtusa 
infra cuneata. Racemi numerosi, plusminusve stricti, 
subdense multiflori. Flores perparvi, membranacei, gla- 
bri. Sepala persimilia, ovata, acuta, conspicue uninervia. 
Petala multo minora, obovato-ovalia, subacuta, uniner- 
via. Labellum petalis paulo majus, valde concavum, 
suborbiculari-ovatum, acutum. Columna comparate con- 
spicua, e basi gracili valde clavato-dilatata. 
Plant medium-sized, slender. Rhizome apparently 
abbreviated. Roots fibrous, filiform, glabrous, numerous. 
Stems caespitose, sometimes in pairs enveloped at the 
base by two or more imbricating scarious sheaths, very 
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