ORCHIDACEAE QUAEDAM AMERICANAE 
long, about fifteen-flowered. Floral bracts about 2 mm. 
long, embracing the rachis, infundibuliform, obliquely trun¬ 
cate. Pedicel and ovary about 3.5 mm. long, slender. 
Flowers nearly 4 mm. long, subdistichous, the lowermost 
ones 5-8 mm. apart. Lateral sepals 4 mm. long, united to 
about the middle, free portion 1 mm. wide, oblong, tapering 
to an acute tip, 3-nerved, prominently carinate. Dorsal 
sepal similar to the laterals, united with them to about the 
middle, 3-nerved, acute, carinate. Petals about 1 mm. long, 
oblong, obtusely 3-lobed at the tip, 1-nerved, membra¬ 
naceous. Labellum 2 mm. long, 3-lobed; lateral lobes erect, 
rounded in front, about 1 mm. long, with a large callus near 
the tip; middle lobe 1 mm. long, about 1 mm. wide, sub- 
orbicular, obtuse, fleshy, margin obscurely erose; disc very 
fleshy, 3-nerved. Column 3 mm. long including the concave 
foot, irregularly toothed at the summit. 
Closely allied to Physosiphon guatemalensis Rolfe, from 
which it differs conspicuously in having smaller flowers and 
different petals. 
Costa Rica, Cartago, Juan J. Cooper 481, May 1888. 
5000 feet altitude. (Type in U. S. Nat. Herb. No. 814957. 
Duplicate type in Herb. Ames No. 22527.) 
Stelis chihobensis Ames sp. nov. Herba caespitosa. 
Caules secundarii elongati, monophylli. Folium ligulatum, 
utrinque attenuatum. Pedunculus cum racemo folium 
excedens. Sepala lateralia ovata, obtusa, margine ciliolata. 
Petala subrhomboidea. Labellum carnosum, late reniforme, 
in medio disci callo ornatum. Columna usque ad apicem 
dilatata. 
Roots fibrous, about 1 mm. in thickness, whitish, 
smooth. Secondary stems caespitose, erect, about 2 mm. in 
diameter, up to 7 mm. long, longitudinally sulcate when dry, 
trivaginate. Sheaths brownish, prominently nerved, the 
lower one concealing the base of the stem, closely oppressed, 
tubular; middle sheath 16-20 mm. long, truncate; upper 
sheath from 2.5-3 cm. long, loosely oppressed, tubular, 
truncate, concealing the central portion of the stem. Leaf 
conspicuously petiolate; lamina 6-7 cm. long, about 1 cm. 
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