72. 27. ORCHIDACEAE. 



Rostellum with elongated side lobes which carry the anther 



channels. I2. 



I2. Rostellum with a small tooth-like front lobe. 21 HABENARIA 



Rostellum with a cucullate front looe. 22 BONATEA. 



13- Glands of rostellum transversely connate. Lip spurred. 



Petals longer than the sepals. 17 HOLOTHRIX. 



Glands of rostellum free. I4. 



14. Petals clawed, concave, fimbriate. Lip not spurred. 



18 HUTTONAEA. 

 Petals not clawed. 15. 



15. Rostellum forming a narrow fold between the anther cells. 16. 

 Rostellum broad, triangular below the anther cells. 17. 



16. Column short. Lip spurred or saccate. 



(Gymnadenia R.Br.) 16 SCHIZOCHILUS. 

 Column long. Lip not spurred nor saccate. 



14 BRACYCORYTHIS. 



17. Lip saccate or spurred. 15 PLATANTHERA. 

 Lip not spurred. 20 STENOGLOTTIS. 



18. Pollinia soft, granular or powdery. 19. 

 Pollinia firm waxy. 2I. 



19. Pollinia without stipes or gland. 13 POGONIA. 

 Pollinia with linear caudicle and gland. 2O. 



20. Pollinia connected with rostellum gland by a strap-shaped 



stalk. Front lobe of lip clawed. 11 ZEUXINE. 



Pollinia adhering directly to rostellum gland. Front lobe 



of lip not dilated nor clawed. 12 PLATYLEPIS. 



21. Pollinia 4 or 8 united by a viscid appendage, free from the 



rostellum. Anther 2 celled. 22. 



Pollinia 2 or 4 attached to a stipes and gland of the ros- 

 tellum. Anther cells usually confluent. 24. 



22. Column produced into a foot at the base. Inflorescence 



axis dilated, almost leaflike. Pollinia 4. Epiphytic. 



2 MEGACLINIUM. 

 Column footless. Inflorescence not dilated. Terrestrial. 23. 



23. Pollinia 4. Flowers small, greenish. 1 LIPARIS. 



Pollinia 8'. Flowers showy. 3 CALANTHE. 



24. Terrestrial. Leaves plicate, acute. Column with a distinct 



foot. 25. 



Epiphytic. Column footless or leaves distichous and bilobed. 26. 



25. Sepals narrow and less coloured than petals, usually re- 



flexed. £ LISSOCHILUS. 



Sepals and petals equal or nearly so, spreading. 



4 EULOPHIA. 



26. Lip not spurred or saccate. Leaves plicate acute. 27. 

 Lip spurred or saccate at base. Leaves distichous, cor- 

 iaceous aad variously bilobed. 28. 



