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JUN 1 1938 
BOTANICAL MUSEUM LEAFLETS 
HARVARD UNIVERSITY 
PRA N 
CaMBRIDGE, MassacuusetTts, JUNE 1, 1938 VoL. 6, No. 2 
STUDIES IN STELIS. VII 
BY 
Oakes AMES 
Two sPpEcIES OF STELIS from Costa Rica receive at- 
tention here, one a member of the section characterized 
by stigmatic lobes on the gynostemium, the other a mem- 
ber of the section in which the stigmas are more or less 
confluent beneath the triangular rostellum. Both species 
were collected by Alexander F. Skutch. 
Krom our present knowledge of the orchid flora of 
Middle America, Stelis is preponderantly Costa Rican. 
With the addition of the species described below, the 
genus is now known to be represented in Costa Rica by 
forty-two species. 
Stelis planipetala Ames sp. nov. 
Caules secundarii graciles, caespitosi, monophylli, 
vaginis tubularibus vestiti. Folium anguste oblongo- 
lanceolatum, utrinque attenuatum, apice conspicue tri- 
dentatum. Racemus gracilis, cum pedunculo folium 
excedens, multiflorus. Sepala lateralia ovato-elliptica, 
trinervia, intus glandulosa. Sepalum dorsale simile. Pe- 
tala membranacea, subquadrata, leviter apiculata, uni- 
nervia. Labellum a latere visum triangulum, superne ex- 
‘avatum, infra medium callo vel septo membranaceo 
ornatum. Columna petala aequans, antice utrinque lobo 
carnoso elliptico stigmatifero instructa. 
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