BOTANICAL MUSEUM LEAFLETS 
HARVARD UNIVERSITY 
CamsBripGr, Massa 
Vor. 10, No. 7 
CHUSETTS, JULY 8, 1942 
ORCHIDACEAE PERUVIANAE IV 
BY 
CHARLES SCHWEINFURTH 
THE PRESENT ARTICLE is the fourth of the series de- 
scribing novelties in the orchid flora of Peru. It contains 
twelve species and three varieties which seem to be new. 
Pleurothallis brevispicata C. Schweinfurth sp. nov. 
Herba parva, epiphytica, caespitosa. Caules graciles, 
vaginis tubularibus arctis lepanthiformibus omnino tecti. 
Folia elliptica vel oblongo-elliptica, acuta, infra sensim 
angustata. Racemi unici vel quinque, folio subaequales, 
pauciflori, demum arcuati. Flores parvi, membranacei. 
Sepalum dorsale ovatum vel ovato-lanceolatum, acutum 
vel breviter acuminatum, concavum, trinervium. Sepala 
lateralia lanceolata vel anguste lanceolata, obliqua, acu- 
minata, uninervia, carinata, apice recurva. Petala multo 
breviora, oblongo-obovata, apice late rotundata, uniner- 
via. Labellum recurvum, expansum ovato-oblongum, 
apice rotundatum, parte basali bicarinatum. Columna 
perbrevis, pedata. 
Plant small, epiphytic, caespitose, up to 12 cm. high. 
Roots fibrous, glabrous. Stems slender, rarely super- 
posed, entirely concealed by close tubular sheaths, up to 
10 cm. long, erect or spreading. Cauline sheaths lepan- 
thiform, commonly five to seven, longitudinally nerved, 
terminating in spreading ovate marginate hispid mouths. 
Leaf small, gradually narrowed into a more or less dis- 
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