15-17 mm. long and about 6 mm. broad, linear-oblong 
in outline, constricted above the base and again below 
the apex; terminal portion ovate, crenulate, obtuse or 
acute; basal portion concave; disc pubescent. Column 
of the section Sarcoglottis. 
Mexico: Barranca del Laurel, Moralia, State of Michoacan, altitude 
2000 m., ““9.5.1912,’? Arséne 9026 (Type in U.S. Nat. Herb.). 
Spiranthes congestiflora resembles several of the species 
of the Sarcoglottis section of Spiranthes, but does not 
match any one known to me. The congested inflores- 
cence is distinctive. 
Spiranthes falcata L. O. Williams sp. nov. 
Herbae terrestres, graciles, 17-85 cm. altae. Inflores- 
centia brevis, pauciflora. Sepalum dorsale lanceolatum, 
acutum vel obtusum, trinervium. Sepala lateralia lin- 
eari-lanceolata, acuta vel obtusa, trinervia. Petala ellip- 
tico-lanceolata, faleata, acuta vel obtusa, trinervia. La- 
bellum oblongo-panduratum ; lobus terminalis subrotun- 
datus, obtusus; lobi laterales acriter angulati. Columna 
generis. 
Small, erect, terrestrial, slender herbs, 17-35 em. tall. 
Stems slender, more or less covered with scarious, hya- 
line, striated, semiamplexicaul bracts. Leaves withered 
at anthesis, apparently elliptic and 4-8 cm. long, basal or 
nearly so. Inflorescence short, few-flowered ; floral bracts 
similar to the cauline bracts, lanceolate to ovate-lanceo- 
late, acuminate. Dorsal sepal about 5 mm. long and 2 
mm. broad, lanceolate, acute or slightly obtuse, 3-nerved. 
Lateral sepals about 5 mm. long and 1.5 mm. broad, 
linear-lanceolate, acute or obtuse, 3-nerved. Petals about 
5 mm. long and 1.5 mm. broad, elliptic-lanceolate, fal- 
cate, acute or obtuse, 8-nerved, lightly adnate to the 
dorsal sepal. Lip 6-7 mm. long and 8-3.5 mm. broad, 
oblong-pandurate, somewhat attenuated at the base; 
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