KEY TO GENERA 



Lip jointed with base of column, not 



spurred. Flowers purple or rose 41. Bletia. 



Claw of lip connate with column, 

 forming a tube, spurred. Flowers 



white 40. Calanthe. 



Pollinia 4. 



Lip produced into a wide spur 18. Galeandra. 



Lip forming a chin between the lateral 

 sepals. Flowers greenish, with purple 

 lip... 42. Eulophia. 



Lateral sepals forming a chin. Flowers 



white 43. Govenia. 



iv. Leaves fleshy, linear, semi-terete. Flowers 



small, pink; lip 3-lobed 36. Tetramicra. 



II. Climbing Plants with fleshy 



Fruit 3. Vanilla. 



III. Plants growing on Trees, Rocks or Stones, 

 not in the Soil. 



(Sometimes it may be difficult to decide whether a plant should be 

 included under I. or III., as it may be growing amongst moss on rocky 

 ground and apparently terrestrial, but unless it is actually growing in 

 soil, it should be classed amongst the epiphytic orchids.) 



i. Leaves plaited. 

 Pollinia 8. 



Raceme from base of pseudobulb. Ovary 



3-winged. Pseusobulbs present 27. Ccelia. 



Flowers with large bracts in terminal 



heads or spikes. No pseudobulbs 38. Elleanthus. 



Pollinia 4. 



Peduncles several, with one flower on each. 



Flowers greenish. Pseudobulbs present 44. Lycastc. 

 Flowers whitish, with a blue variegated 



lip. No pseudobulbs 46. Zygoprtalum. 



Raceme with several flowers. Pseudobulbs 45. Xylobium. 



ii. Leaves not plaited. 



Lip on upper side of flower (see also some 

 species of Epidendrum and Oncidium). 

 Plant very small. Flowers in head with 



large bracts 11. Stenoptera. 



Plant not very small. Flowers in panicles, 



bracts small 19. Polystachya. 



Lip on lower side of flower (but some species 

 of Epidendrum and Oncidium have lip 

 on upper side). 



A. Pollinia 4. 



a. Column with foot, with which the 

 sepals more or less form a chin. 

 1. Lip free, jointed to foot of 

 column. 

 Flowers small, several, on 

 stalk from base of pseudo- 

 bulb 47. Bulbophyllum. 



