BOTANICAL MUSEUM LEAFLETS 
HARVARD UNIVERSITY 
VoL. 16, No. 3 
CampripGcre, Massacuusetts, May 15, 1953 
STUDIES ON PERUVIAN PLEUROTHALLIS 
BY 
CHARLES SCHWEINFURTH 
THe following notes on Pleurothallis in Peru include 
two new species and six new varieties, as well as other 
nomenclatural discussions. 
Pleurothallis angustipetala C. Schweinfurth sp. 
nov. 
Herba mediocris, epiphytica, cum rhizomate repenti. 
Caules graciles, unifoliati, vaginis pluribus ornati. Folium 
breviter petiolatum ; lamina oblongo-elliptica, obtusa vel 
acuta, basi cuneata. Inflorescentia unica, folio multo 
longior, supra subdense multiflora. Flores minores, se- 
cundi, cum segmentis patentibus. Sepala similia, lanceo- 
lata vel anguste lanceolata, supra longe angustata, later- 
alia leviter recurva. Petala circiter duplo breviora, line- 
aria, acuta. Labellum petalis paulo longius, lateraliter 
visum sigmoideum, pandurato-oblongum, obtusum vel 
subacutum; pars basalis carinis binis humilibus ornata; 
pars anterior paulo major, oblongo-ovata. Columna par- 
va, cum ala terminali tridentata. 
Plant medium-sized, epiphytic, slender. Rhizome 
creeping, concealed by blackish sheaths. Roots fibrous, 
glabrous. Stems apparently in pairs, slender, about 4-11 
em. long, unifoliate, bearing three or four close, tubular 
sheaths, the uppermost being longest and commonly 
separated. Leaf petioled, up to 7.2 em. long; lamina 
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