TROPICAL AMERICAN ORCHIDS 
with but one distinct nerve. Dorsal sepal 4.8 mm. long in¬ 
clusive of the connate basal portion; free part about 4.2 mm. 
long, about 1.1 mm. wide above the middle, abruptly acute, 
with but one distinct nerve. Petals linear, adherent to and 
slightly shorter than the dorsal sepal, free part about 3.4 mm. 
long, obtuse or acute at the very oblique apex, 1-nerved. 
Labellum shortest of the perianth segments, narrowly pan- 
durate-lanceolate, acute, lightly constricted just below the 
apex, 4.2 mm. long, about 1.6 mm. wide near the middle, 
base unguiculate, lower portion with a pair of conspicuous 
fleshy nipple-shaped callosities. Disc 3-nerved, the anterior 
margins minutely cellular-ciliolate. Column short, with a 
bifid rostellum. 
An allied species is Spiranthes gujjanensis (Lindl.) Cogn., 
which has smaller flowers and a different lip. [Fig. 1: habit 
life size. 1, labellum, side view X 7. 2, labellum, front view 
X 7. 3, flower, side view X 4. 4, column with anther X 7. 
5, petals, dorsal sepal and one lateral sepal X 6.] 
Panama, Upper Chagres River Range, C. W. Powell 
377, January-February 1924. Terrestrial in woods where 
sun shines sparingly. Flowers white. (Type in Herb. Ames 
No. 27954.) 
Stenorrhynchus bracteosus A.&S.sp.nov. Herba ter- 
restris. Folia rosulata, oblique ovata, longipetiolata. Caulis 
vaginis paucis ornatus. Spica brevis, densa. Bracteae 
flores multo superantes. Sepala parte inferiore connata, 
lanceolata, trinervia. Petala spathulato-linearia. Labellum 
lanceolatum, prope medium dilatatum. Columna generis. 
Plant terrestrial. Roots fasciculate, stout, densely 
villous-lanuginose, 5-8 cm. long, about 5 mm. in diameter. 
Stem about 33 cm. long (from the sheathed base to the apex 
of the arcuate inflorescence), mostly glabrous, lanuginose 
below the inflorescence, sheathed below by the imbricate 
bases of the petioles, with five loose membranaceous sheaths 
above, the lower of which are tubular at base and lanceolate 
above (the largest 7.2 cm. long). Leaves rosulate, seven 
in our specimen; petioles 9-11.5 cm. long, slender and chan¬ 
nelled above, gradually dilated below into a membranaceous 
6 
