332 ORCHIDACEAE. 
Leaves 2-3, lanceolate. Upper sepal broad, concave; lateral 
narrow. Lip broad, papillose or ridged. Column not winged .. 15. LyPHRANTHUS. 
Leaves 2, radical, oblong. Upper sepal broad, coneave; lateral 
narrow-linear. Lip broad, with raised glands on the dise. 
Column winged, wings produced into 2 erect lobes at the top .. 17. CHILOGLOorTTts. 
*** Leaf solitary, broad. 
Flower solitary, large, purple. Upper sepal broad, concave ; 
lateral and petals long and filiform or minute, Lip large, broad, 
involute. Column very short is on ra 
Flower solitary. Upper sepal narrow, concave ; lateral and petals 
lanceolate. Lip 3-lobed ; disc with raised glands. Column long, 
winged above ; wing produced upwards into 2 toothed lobes .. 18. ADENOCHILUS. 
Flowers 1 or 2. Upper sepal broad, concave ; lateral lanceolate. 
Petals minute. Lip broad, undivided; disc smooth. Column 
long, equally winged, wings not produced upwards .. 19. Townsonta. 
Flowers several. Sepals and petals narrow, acuminate. Lip 
spreading, broad, concave. Columnlong . . ara 
Flowers 2-3. Sepals and petals linear, obtuse. Lip spreading, 
narrow, flat. Column long, winged above is oa 
20. CORYSANTHES. 
12. ACIANTHUS. 
13. CYRTOSTYLIS. 
**** Leafless. Stem tall, with brown sheathing scales. 
Sepals and petals united into a 5-lobed ventricose tube .. .. 21. GasTRopia. 
The above clavis is purely artificial, and is solely intended to facilitate the deter- 
mination of the genera. The following arrangement, which is adapted from Hooker 
and Bentham’s “ Genera Plantarum ” and Engler’s “‘ Pianzenfamilien,” is more natural 
and shows the sequence adopted in this work :— 
Tribe I. EprmpENDREAE.—Anther lid-like, usually deciduous; cells parallel, distinct. 
Pollinia waxy, 1-4 in each cell, free, or those of each cell connected by a viscid. 
appendage, not attached by their bases or by a caudicle to the rostellum. 
1. DENDROBIUM. 2. BULBOPHYLLUM. 3. EARINA, 
Tribe II. Vanprar.—Anther lid-like, usually deciduous, resting on the rostellum ;. 
cells usually confluent. Pollinia waxy, usually 2 or 4 in. superposed pairs, attached 
singly or in pairs to a gland or process of the rostellum, which comes away with 
them when they are removed. 
4, SARCOCHILUS. 
Tribe II. Nzorrrman.—Anther lid-like or erect and persistent; cells distinct, parallel. 
Pollinia granular or powdery. 
| Subtribe 1. Spirantheae. 
5. SPIRANTHES. 
Subtribe 2. Thelymitreae. 
6, THELYMITRA. 
Subtribe 3. Diurideae. 
7. OrnTHOCERAS. §. Microtis. 9. PRASOPHYLLUM. 
Subtribe 4. Pterostylideae, 
10. CaLHaNnaA. 11. PrerRosryris. 
Subtribe 5. Caladeniae. 
12. AciANTHUS. 13. Cyrtostyzis. 14. CALOCHILUS. 15. LyPERANTHUS. 16 CALA- 
DENIA. 17. CHILoGLorris. 18. ADENOCHILUS. 19. TOWNSONIA. 
Subtribe 6. Pogonieae. 
20, CORYSANTHES. 
Subtribe 7. Gastrodieae. 
21. GaAsTRODIA. 
