6 ORCHIDS OF JAMAICA 



KEY TO GENERA. 



I. Terbesteial Plants (growing in soil). 



Anther-cells distant, diverging, with the stalks of 

 the pollinia in special tubes and each ending 



in a naked gland •. 1. Bahenaria. 



Anther-cells closely approximate. 



i. Leaves membranous, not plaited. Pollinia 



granular (i.e. breaking up into granules 



oi?i removal), 2 or 4. 



Anther deciduous, opercular, on the matgin 



bf the clinandrium. Pollinia 2. Leaves 



along the stem or wanting 2. Pogonia. 



Anther persistent, parallel to the back of the 

 long rostelluni. PoUinia 2 or 4. Leaves 

 generally radical. 

 &. Lip on the lower side of the flower. 

 Lateral sepals combined into a spur. 

 Spur enclosing the elongated base 



of the lip 4. Pelexia. 



Spur not enclosing ba^e of lip. 



Bracts coloured 5. Stenorrkyncos. 



Lateral sepals free. 



Lip not spurred 6. Spiranthes. 



Lip spurred 7. ErytJirodes. 



b. lAp on the upper side of the flower. 

 Lateral sepals forming a spur. 



Spur short. Leaves wanting 8. WuUschlcegelia. 



, Spur very long. Leaves present ... 9. Pseudocentrum. 

 v Lateral sepals not forming a spur. 



Lip inserted at base of column, free 10. CranicMs. 

 Lip inserted on the cup formed by 



the base of the sepals, which have . 



grown together , 12. Prescottia, 



Lip and petals inserted on the Wng 



column 13. Ponthieva. 



ii. Leaves membranous, not plaited. Pollinia 

 waxy (not breaking up into granules), 4. 

 Colmnn long, curved. Anther terminal, 



opercular, incumbent, deciduous 17. Lipdris. 



Column short, erect. Anther enclosed by 



the clinandrium, persistent 16. Malaxis. 



ill. Leaves papery, plaited. 



Flowers small, in terminal and axillary 

 panicles. Pollinia 2, granular. 

 Sepals cohering into a tube. Lip linear 



from base. Column long 14. Corymborchis. 



Sepals, lateral connate into a short chin. 



Lip saccate at base. Column short... 15. Tropidia. 

 Flowers large, racemose on a scape. Pollinia 

 4 or 8, waxy. 

 Pollinia 8. 



[Lip continuous with base of column, 



spurred. Flowers white and brown... 39. Phaius.'} 



