— 601 — 



2. Lobus intermedius et laterales laceri v. finibri- 

 ati V. lobi plus niinus confluentes, petala lacera 

 V. integra (Bor.-Americ.) (Species 2 — 10.) 



Sect. 2. FhnLriakiG. 



3. Lobi labelli onnies integri, petala quam sepala 

 paulum longiora. (Species 2 Madagascarienses.) 

 (Spec. 11 — 12.) Sect. 3. Pneudoholothrlx. 



B. Labellum subsimplex. 



3. Labelhim maximum quam sepala et petala nuilto 

 majus. (Sp. 13 — 17.) Sect. 4. Galeandrlfoniies. 



4. LabeHiim quam sepala petalatiue longius antice 

 trilobulum v. tridentatum. (Species 18 — 22.) 



Sect. 5. Virides. 



C. Labellum omnino simplex. 



5. Caulis basi foliis 1 v. 2 v. 3 majoribus vestitus, 

 calcar plerumque longum, racemus pauci— pluii- 

 rarius nmltiflorus. (Species 23—47.) 



Sect. G. Bifolia. 

 G. Caulis elongatus foliosus, racemus elongatus 

 nmltiflorus, calcar liaud v. rarissime elongatum. 

 (Species 48 — 55.) Sect. 7. Dolichostachijae. 

 II. H e t e r b 1 a s t a e. 



Caules breves folio 1 (v. 2) magno instructi a caulibus 

 tloriferis parvifoliis bene distincti. (Species 5G— 58.) 



Sect. 8. Mecosa. 



Sect. 1. i?usauiia. 

 Labellum excavatum longe calcaratum trilobum, lobi late- 

 rales magni Habellati margine profunde incisi, lobus iiiter- 

 medius multo minor integer lanceolatus. Planta maxima. — 

 Indica, 



1 . P 1 a t a n t li e r a S u s a n n a e Lindl. Tuberibus 7 

 — 10 cm longis, caule elato robusto ad 80 — 100 cm alto folioso, 

 foliis ovati-oblongis v. oblongi-lauceolatis acutis acumiiiatisve 

 supremis vaginantibus in bracteas magnas foliaceas decrescen- 

 tibus, racemo paucifloro, floribus maximis generis 10 cm diam. 

 Sepalis latissime oblongis obovatis (subciuadratisj antice ob- 



