cure mentum. Petals agglutinate with dorsal sepals, with an 
oblique base. Lip sessile, from a cuneate-canaliculate base con- 
duplicate. The margins at base incrassate, in middle agglutinate 
with sides of column. Column rather fleshy, heavy, basally pro- 
duced ina short, oblique foot; stigmata 2, situated on a deeply 
cleft, biparted, well-separated, more or less cartilaginous plate; 
rostellum narrowly triangular, acuminate, pliable. Anther nar- 
rowly elliptic, obtuse; pollinia linear-clavate, separate, with a 
large, conspicuous, oblanceolate-obovate viscidium. Ovary ses- 
sile, obliquely fusiform, somewhat twisted. 
Terrestrial, tall plants. Roots fasciculate, fleshy. Leaves basal, 
rosulate, with cuneate-subpetiolate bases. Scape erect, vaginate, 
terminated by a subdensely many-flowered spike which is more 
or less cernuous at apex. Flowers rather large, suberect. 
TYPE: Odontorrhynchus Ghillanyi Pabst 
One species, so far known only from Brazil. 
Index to species 
Thelyschista Ghillanyi (Pabst) Garay, comb. nov. 
Basionym: Odontorrhynchus Ghillanyi Pabst in Bradea 2: 166, 1977. 
Trachelosiphon Schltr. 
actinosophila (Barb.Rodr.) Schltr. = Eurystyles actinosophila (Barb.Rodr.) 
Schltr. 
ananassocomos (Rchb.f.) Schltr. = Eurystyles ananassocomos (Rchb.f.) 
Schltr. 
Cogniauxii (Krzl.) Schltr. = Eurystyles Cogniauxii (Krzl.) Schltr. 
colombianum Schltr. = Eurystyles colombiana (Schltr.) Schltr. 
cristatum Schltr. = Eurystyles cristata (Schltr.) Schltr. 
Lorenzii (Cogn.) Schltr. = Eurystyles Lorenzii (Cogn.) Schltr. 
paranaénse Schltr. = Eurystyles paranaénsis (Schltr.) Schltr. 
Triorchis Petiver ex Nieuwl. 
Beckii (Lindl.) House = Spiranthes lacera (Raf.) Raf. 
cernua (L.) Nieuwl. = Spiranthes cernua (L.) L.C.Rich. 
gracilis (Bigel.) Nieuwl. = Spiranthes lacera (Raf.) Raf. 
Grayi (Ames) Nieuwl. = Spiranthes tuberosa Raf. 
laciniata (Small) House = Spiranthes laciniata (Small) Ames 
linearis (Rydb.) Nieuwl. = Spiranthes vernalis Engelm. & Gray 
longilabris (Lind|.) House = Spiranthes longilabris Lindl. 
ochroleuca (Rydb.) Nieuwl.= Spiranthes ochroleuca (Rydb.) Rydb. 
odorata (Nutt.) Nieuwl. = Spiranthes odorata (Nutt.) Lindl. 
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