CampripGr, Massacnusetrts, Fesruary 19, 1935 
BOTANICAL MUSEUM LEAFLETS 
HARVARD UNIVERSITY 
ADDITIONS TO THE ORCHID FLORA 
OF BRITISH GUIANA 
BY 
CHARLES SCHWEINFURTH 
‘THE FOLLOWING CONTRIBUTION to our knowledge of 
the orchids of British Guiana consists of ten apparently 
undescribed members of the Pleurothallideae viz. : one 
species of Stelis, four species of Pleurothallis and five spe- 
cies of Octomeria. The collectors represented are EF. F. 
im Thurn, G.Jenman and N. Y.Sandwith. In general the 
descriptions are based on herbarium specimens, but in a 
few cases these were supplemented by water-color draw- 
ings. For the opportunity to describe these species, we 
are indebted to the Royal Botanic Gardens at Kew and 
to the New York Botanical Garden and extend our thanks 
to them for the loan of the material upon which the de- 
scriptions were based. 
Stelis perparva C. Schweinfurth sp. nov. 
Herba perparva, caespitosa, epiphytica. Radices fi- 
brosae, glabrae. Caules brevissimi, unifoliati. Folium 
obovato-ellipticum vel cuneato-spathulatum. Inflores- 
centia folia multo superans; pedunculus filiformis. Race- 
mus pluriflorus. Flores carnosi. Sepala intus minute 
papillosa. Sepala lateralia per dimidium inferius connata, 
parte libera oblique rotundato-ovata. Sepalum dorsale 
majus, acutum. Petala minuta, late cuneata, apice trun- 
cata. Labellum minutum, subrotundato-flabellatum. 
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