bicuspidate. Anther ovate, acute; pollinia clavate with narrowly 
elliptic viscidium. Ovary arcuately cylindric, twisted. 
Terrestrial, small plants with fasciculate, fusiform roots. Leaf 
cordate, basal, horizontal on soil. Stem erect, pilose, terminated 
by a subdensely many-flowered spike. Flowers small, glandulose- 
pilose. 
TYPE: Spiranthes scopulariae Rchb.f. 
One species, native to Panama, Venezuela, Trinidad and 
Brazil. 
Index to species 
scopulariae (Rchb.f.) Schltr. 
Dithyridanthus Garay, gen. nov. 
Etymology: Di- = prefix, two, thyridos = small windows and 
anthos = flower, describing the two lateral open- 
ings formed by the dorsal and lateral sepals at 
the base of the flower. 
Sepala subsimilia, conniventia, leviter arcuata, ad basin 
urceolatim extensa, utrinque aperturam quasi fenestram basa- 
lem formantia; sepala lateralia inter se breviter connata, ungue 
labelli dorsaliter adnata, et cum eo saccum didymum satis con- 
spicuum formantia. Petala margine interiore sepalo intermedio 
agglutinata, linearia. Labellum carnosum, satis longe unguicula- 
tum, ungue ad basin columnae arcuatim decurvo, sepalis latera- 
libus adnato et cum ils mentum prominens ostendenti; lamina 
labelli unguem rectangulariter inserta, conduplicata, apice re- 
curva, basi excavato-gibbosa, margine in medio utrinque lateri- 
bus columnae modice agglutinata. Columna apici ovarii rec- 
tangulariter inserta, satis brevis, arcuata, basi obliqua sed 
apoda, dorsaliter sepalo intermedio adnata, facie puberula; 
stigmata 2, longitudinaliter elliptica, confluentia, apice biloba; 
rostellum satis rigidum, oblongo-lineare acuminatum, satis 
elongatum. Anthera ovata, umbonata, acuta; pollinia clavata, 
glandula lineari-oblonga affixa. Ovarium cylindricum, paululo 
tortum, apice arcuato-colliforme. 
315 
