guiculate with free, falcate, callose processes at base, not truly 
sagittate; blade conduplicate-arcuate with the lateral margins 
agglutinate to sides of column. Column rather short, stout, with 
an obliquely descending foot; stigmata 2, tightly approximate to 
confluent, bilobed (not free and separated as stated); rostellum 
cartilaginous, broadly triangular, acute at the more or less ob- 
scurely 3-lobulate to 3-dentate apex, with a large, V-shaped 
groove in front to accomodate the conspicuous viscidium. 
Anther ovate-cucullate, acute, cordate at base; pollinia clavate 
with a conspicuous, more or less elliptic viscidium. Ovary cylin- 
dric to obliquely fusiform, subsessile, more or less twisted. 
Terrestrial herbs, commonly leafless during anthesis. Roots 
fasciculate, fusiform, tuberous. Stem erect, completely enclosed 
by imbricating, sometimes almost foliaceous sheaths, terminated 
by a densely many-flowered, more or less cylindrical spike. 
Flowers small. 
TYPE: Stenorrhynchus Castillonii Haum. 
Five species native to Bolivia, Peru, Argentina and Chile. 
Index to species 
alticola Garay 
Castillonii (Haum.) Correa 
Odontorrhynchus chilensis (A. Rich.) Garay, comb. nov. 
Basionym: Spiranthes chilensis A. Rich. in Gay, Hist. Nat. Chile, Bot. 5: 
475, 1852. 
Odontorrhynchus chlorops (Rchb.f.) Garay, comb. nov. 
Basionym: Spiranthes chlorops Rchb.f., Xenia Orch. 3:20, 1878. 
Ghillanyi Pabst = Thelyschista Ghillanyi (Pabst) Garay 
variabilis Garay 
Ophrys L. 
aestiva Balb. = Spiranthes aestivalis (Poir.) L.C. Rich 
aestivalis Poir. = Spiranthes aestivalis (Poir.) L.C. Rich. 
aestivalis Michx. = Spiranthes vernalis Engelm. & Gray 
autumnalis Balb. = Spiranthes spiralis (L.) Chevall. 
cernua L. = Spiranthes cernua (L.) L.C. Rich. 
peregrina Sessé & Moc. = Dichromanthus cinnabarinus (Llave & Lex.) 
Garay 
peruviana Aubl. = Spiranthes torta (Thunb.) Garay & Sweet 
pubescens Sess¢ & Moc. = Stenorrhynchos aurantiacum (Llave & Lex.) 
Lindl. 
341 
