ORCHIDACEiE. 267 



CONSPECTUS OP THE TRIBES AND GENERA. 



Tribe 1. MALAXIDEiE. Pollen cohering in waxy masses, without any of the cellular substanco by 

 which the grains are connected, remaining under the form of a distinct gland lying upon the 

 Etigma, or of a transparent caudicula between the pollen masses and the gland. 



1. MiCROSTYLis. Lip flat, sagittate or deeply cordate. Column very small, round. Anther terminal. Pollen-macses 4. 



2. CoRALi.ORHiZA. Sepals and petals connivent. Lip mostly produced behind. Column free. Masses of pollen 4, 



oblique (not parallel). 



3. Aplectrcm. Sepals and petals connivent, equal. Lip with a claw, not produced at the base. Anther below the 



summit of the column. Masses of the pollen 4, oblique. 



4. LiPiRis. Sepals spreading. Lip flat, expanded, entire. Column winged. Pollen-masses 4. 



Tribe 2. VANDE^. Pollen cohering in waxy masses. Caudicles separating along with the glands of 

 the stigma, and forming a close adhesion to the pollen-masses. Anther terminal, rarely dorsal, 

 opercular. 



5. TiPTTLARiA. Sepals spatulate, spreading. Lip spurred underneath at the base. Column projecting. Pollen-masses 



4, parallel. 



Tribe 3. OPHRYDEjE. Pollen cohering in very numerous grains which are collected on a cobweb-like 

 tissue, and fixed to the glands of the stigma. Anther terminal, erect or resupinate, persistent ; 

 the cells complete. 



t Flower ringent. Lip with a spur at the base underneath. Follen-masses stalked, with a gland at the base. 



6. Orchis. Glands of the stalks of pollen-masses in a common little pouch. 



7. Gymnadenia. Glands of the stalk of the pollen-masses approximated, naked. 



8. Platanthera. Cells of the anther widely separated. Glands of the pollen-masses naked. 



Tribe 4. ARETHUSEiE. Anther opercular, terminal. Pollen-masses farinaceous, or consisting of 

 loosely cohering grains. 

 0. Arethcsa. Lip united at the base with the column, cucuUatc above, crested inside. Pollen angular. 



10. PoGONiA. Perianth without glands. Lip cucullatc, crested inside. Pollen farinaceous. 



11. Calopogon. Lip at the back of the flower, unguiculate, bearded on the face. Pollen angular. 



Tribe 5. NE0TTIE.,E. Anther parallel with the stigma, erect. Pollen as in the preceding tribe. 



12. Spiranthes. Spike spiral. Lip sessile, beardless, the base covered by the two lateral exterior sepals. Column 



wingless. Pollen farinaceous. 



13. GooDTERA. Lip entire at the extremity, the base gibbous and included in the lateral exterior sepals. Pollen 



angular. 



14. LiSTERA. Lip 2-lobed. Column wingless. Anther fixed by its base. Pollen farinaceous. 



Tribe 6. CYPRIPEDIEjE. Anthers 2, with a dilated petaloid lobe between them. Lip large, inflated 

 and saccate. 



15. Ctpripedicm. Character that of the tribe. 



Tribe I. MALAXIDEjE. Lindl. 



Pollen cohering in masses of a waxy texture, without any of the cellular connecting tissue, 

 or of a transparent tail-like process. Anther terminal or operculate. 



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