1516 CXXVII. ORCHIDB^. 



Sepals and petals ereeto-patent, subequal. Labellum sessile, broad froaj, 

 the base, ventricose, erect, almost complicate. Stems short, leafy, and 

 leafless scapes arising from a stout subtuberous rootstook . . . . . 16. Geodok0M. 



Sepals and petals spreading. Pollen-masses after removal attached to 2 

 distinct stipes. Stems leafy or leafless. Pseudo-bulbs none .... 17. Dipodium. 



SuBTMBE 3. Sarcanthese. — Stems willimit pseudo-hulbs, rooting. Leaves distichoiis. 

 {rarely none) not plaited. Peduncle lateral or axillary. 



Sepals and petals not spreading widely. Labellum not jointed at the base 

 usually larger than the sepals. Stipes of the pollen-masses oval-flat. 

 Leaves terete ; flowers in short spikes 18. LnisiA. 



Labellum shortly incumbent or adnate to the base of the column, blade 

 fleshy, top often inflexed, gibbous or shortly spurred. Stipes of the 

 pollen-masses linear or oblong. Flowers usually small, racemose . . .19. Saecochilus.. 



Spur of the labellum almost closed with a callus or lamella. Flowers 



small, crowded in simple or branched racemes . 20. Cleisostoma. 



Sepals spreading ; lateral connate at the base of the claw of the labellum 

 and together with it forming a spur. Labellum broadly 2 or 3-lobed 

 often fimbriate. Stipes of the pollen-masses strap-shaped. Flowers 

 small, in simple or branched racemes 21. Obnithoohilus.. 



Sepals conniveut or subpatent, bases often connate. Pollen-masses 4, 

 distinct'; stipes short. Dwarf herbs, leafless or few-leaved. Flowers 

 minute ....'- 22. T^niophyllum. 



TiiiEE III. Neottleee. — Stem not bulbous {roots often btdbous). Anther 1, posticons,. 

 operculate or erect and persistent ; cells distinct, parallel. Pollen granular or powdery or in 

 small masses, 



SuBTEiBB 1. Vanilles. — Stems tall erector climbing, often branched. Racemes or panicles- 

 terminal or terminal and axillary. Anther subopercvlate, incumbent on a short rostellum. 



Climbers. Leaves none or on flowerless branches.- Sepals spreading or 

 broadly concave. Labellum broad, concave, loosely investing the 

 column . . • 23. Galeola. 



Sbbteibe 2. Corymbeae, — Stem tall, sometimes branched. Leaves broad. Baceihes or 

 jyanicles terminal. Anther erect, parallel to the erect rostellum. 



Sepals and petals narrow, cohering in a tube. Labellum linear, column 



elongate. Flowers in a loose panicle 24. Coeyhbis. 



StTBTEiBE 3. Spirantheae. — Stem simple. Roots usually thick tuberlike fibres. Leaves- 

 membranous or wanting. Anthers erect or inclined forward, parallel to the elongate rostellum.. 



Claw of the labellum long, spreading, fimbriate ; blade 2-lobed, clinandrium 



cupular. Leaves subradical, ovale, often coloured 25. Anjectochilus. 



Dorsal sepal and petals together forming a hood ; lateral and column 

 deourrent on the ovary or spike, lax or dense-fid, often secund or 

 spiral 26. Spieakthes. 



Stem with 2 opposite or subopposite leaves^ Sepals and petals free, 



spreading 27. Listeea. 



Sepals free. Labellum sessile, erect, entire. Clinandrium cup-shaped . 38. Goodyeea. 



Sepals free or connate below. Labellum at the baee more or less adnate 

 to the column, entire or with 2 spreading lobes ... 29. Het.ekia. 



Subteibe 4. Diuridese. — Stem simple, erect from an underground tuber. Anther erect or- 

 inclined forward ; rostellum usually short. 



Flowers racemose. Sepals petals and labellum all alike and spreading. 



Column-wings connected at the base in front 30. Thelymitea. 



Flowers racemose. Lateral sepals narrow-linear and long, the dorsal 



embracing the column at the base, erect and open at the end . . . 31. Diukis. 

 Flowers racemose, reversed. Sepals usually narrow. Labellum undivided. 

 Labellum dilated and enclosing the column at the base. Leaves flat. 



Flowers large. No caudicel 32. Ceyptostylis.. 



Labellum contracted or clawed rarely gibbous at the base. Leaves terete. 



Flowers otten small. Caudiole linear 33. Pkasophylltjm.. 



Flowers spicate small and green, not reversed, Labellum entire or 2-lobed. 



Lateral lobes of the column very small. Leaves terete. No.caudicle .34. Mioeotis. 

 Column short. Labellum tubular, erect under the hoodshaped dorsal 

 sepal, with or without a reflexed lamina, lateral sepals and petals very 

 narrow or minute. Small plants with 1 broad leaf and 1 large flower . 35. Coeysanthes.. 

 Column elongate (longer than the anther) semiterete or longitudinally 

 winged. Stems simple, with 1 rarely 2 or 3 or no leaves. Ehizome 

 with annually renewed tubers. 



