ORCHIDACEJE. 181 



Side-lobes of lip small 



or none ; spur narrow 



and cylindric, or short 



and widely saccate ; 



mouth naked or fim- 



briate ; caudicle of 



pollinia very narrow 18. SACCOLABIUM. 



Spur within partially or 



tf completely occluded by 



calli : 



Spur occluded by a dorsal 



scale or by calli on 



the anterior or posterior 



walls, fyut without a 



septum . . .19. CLEISOSTOMA. 

 Spur within partially 



occluded by calli and 



divided by a vertical 



antero-posterior septum 



into two lateral 



chambers . . .20. SARCANTHU'S. 



Pollinia powdery or lamellate, not waxy : 



Anther terminal, pollinia 2 or 4 ; leaf solitary, 



radical, appearirg alter the flowers . 21. POQONIA. 



Anther dorsal ; pollinia 2, bipartite ; 

 leaves several, appearing with the flower, 

 racemes drooping ; lip with a concave 

 or saccate much depressed hypochile 

 jointed at a right angle to the epichile . 22. EPIPACTIS. 



Stigma single, anticous ; lip saccate, the 



sac usually setose within . . . 23. GOODYERA. 



Stigmas two. distant, lateral ; pollinia 

 bipartite; lip saccate, the sac with 

 calli of lamina- within . . .24. ZEFXINE. 



Anthers two, each with one perfect cell ; cells 

 sessile on the column, remote or contiguous, 

 always separate ; pollinia 2. often bipartite, 

 adnate with or without caudicles to separate 

 glands ; leaves flat, membranous. Terrestrial 

 herbs . . 25. HABENARIA. 



