NEW OR NOTEWORTHY ORCHIDS 
Among the Central American species of the genus 
Stelis Siandleyi is most closely allied to the Costa Rican S. 
Tonduziana Schltr. Aside from the 3-nerved sepals which 
constitute a differentiating character, the flowers of A. Stand- 
ley i are materially smaller than those of S. Tonduziana. 
The number of nerves in the sepals of Stelis flowers has 
been regarded as a serviceable differentiating character. I 
have some doubt about this, as recent studies of a large col¬ 
lection of Stelis parvula Lindl. have brought to light a speci¬ 
men in which the nerves of the sepals varied in number from 
three to five. 
Costa Rica, Province of Cartago, La Estrella, Paul C. 
Standley 39483, March 26, 27, 1924. On tree; flowers dark 
purple. (Type in Herb. Ames No. 29144.) 
Stelis triangulabia Ames sp. nov. Radices elongatae, 
valde fibratae. Caules secundarii dense aggregati, caespitosi. 
Folium anguste elliptico-lanceolatum, in petiolum elonga- 
tum contractum. Pedunculus cum racemo gracilis, folium 
superans. Sepala usque ad medium connata, trinervia, usque 
ad apicem sensim rotundata, apice plus minusve acuto. 
Petala cuneata, supra medium incrassata, carnosa, trinervia. 
Labellum breviter unguiculatum, supra unguem distincte 
triangulare. Discus minute glandulosus, prope basim trans¬ 
verse incrassatus. Columna generis. 
Roots whitish, smooth, elongated, fibrous, 1 dm. more 
or less long. Secondary stems densely caespitose, erect, 2-4 
cm. long, with several closely appressed tubular sheaths be¬ 
low the middle, monophyllous. Leaf narrowly elliptic-lan¬ 
ceolate, contracted into a slender petiole; lamina 2-3 cm. 
long, about 4 mm. wide at the middle, tridenticulate at the 
apex; petiole up to 12 mm. long. Peduncle with the raceme 
about 6 cm. long, much exceeding the leaf, arising from the 
axil of the leaf, sheathed at base by a strongly complanate 
spathaceous bract. Raceme 3-4 cm. long, slender, about 
20-flowered, more or less secund. Bracts of the inflorescence 
shortly tubular at base, 2-3 mm. long, with the free portion 
subacute or acute, more or less concave, exceeding the pedi- 
23 
