478 ORCHIDACE.E. (ORCHIS FAMILY.) 



Synopsis. 



I. Anthers solitary, fixed to the apex of the column like a lid, deciduous. 



TRIBE I. MAL/AXIDE^E. Pollen in smooth waxy masses, without stalks or connect- 

 ing tissue. Roots tuberous. 



* Stems leafy. 



1. MICROSTYLIS. Lip cordate or sagittate. Column minute, 2-toothed at the apex. 



2. LIPAKIS. Lip entire. Column elongated, incurved, margined at the apex. 



* * Stems sheathed. 



3. CORALLORHIZA. Spur of the lip short and aduate to the ovary. Root branching, 



toothed. 



4. APLECTRUM. Lip spurless. Root of two solid connected tubers, bearing a single leaf. 



TRIBE II. EPIDENDRE^E. Pollen in smooth waxy masses connected by elastic 

 tissue. 



5. EPIDENDRUM. Pollen masses 4. Claw of the spurless lip adnate to the column. 



6. TIPULARIA. Pollen masses 4. Lip free, spurred. Stem sheathed. 



7. BLETIA. Pollen masses 8. Lip free, hooded, spurless. 



8. HEXALECTRIS. Pollen masses 8. Lip free, obovate, 5 - 6-crested, 3-lobed. Stem 



leafless. 



TRIBE III. VANDEJE. Pollen in smooth waxy masses, fixed by an elastic stalk to the 

 gland of the stigma. 



9. DENDROPHYLAX. Pollen masses 2. Lip with two long spreading lobes. Epiphytes. 



10. POLYSTACHYA. Pollen masses 4. Petals smaller than the sepals. Epiphytes. 



11. CYRTOPODIUM. Pollen masses 2. Petals and sepals equal. Terrestrial. 



TRIBE IV. ARETHUSE.35. Pollen in loose powdery masses. Lip crested. 



12. CALOPOGON. Pollen masses 2, bipartible. Column incurved, winged at the apex. 



13. POGONIA. Pollen masses 2. Column wingless, club-shaped. 



14. ARETHUSA. Pollen masses 4. Column petal-like. Root a solid tuber. 



15. VANILLA. Pollen masses 2. Stem climbing. Flowers in axillary racemes. 



II. Anther solitary, adnate to the column, erect, persistent. 



TRIBE V. OPHRYDE.^. Anther adnate to the apex of the column, the cells separate. 

 Pollen cohering in numberless waxy grains, which are collected by elastic tissue into 

 a large mass, and attached to a gland of the stigma by an elastic stalk. Lip spurred. 



16. ORCHIS. Anther cells contiguous, parallel. Glands of the stigma covered with a com- 



mon hood-like fold of the stigma. 



17. GYMNADENIA. Anther cells contiguous, parallel. Glands of the stigma naked. 



18. PLATANTHERA. Anther cells diverging from the base. Glands of the stigma naked. 



19. HABENARIA. Anther cells diverging. Glands naked. Throat of the stigma furnished 



with variously shaped appendages. 



TRIBE VI. NEOTTIEJE. Anther attached to the back of the column, parallel with 

 the stigma ; the cells approximate. Pollen powdery. 



* Pollen masses 2. 



20. SPIRANTHES. Lip nearly entire, clasping the column, obtuse. 



21. GOODYERA. Lip sessile, entire, contracted above the middle, slender-pointed. 



22. PHYSURUS. Lip sessile, dilated above. Column very short. Stem leafy. 



23. LISTERA. Lip 2-cleft. Stem with a pair of ovate opposite leaves. 



* * Pollen masses 4. 



24. PONTHIEVA. Claws of the petals and lip adnate to the column. 



III. Anthers two, fixed beneath the lateral lobes of the column. 

 TRIBE VII. CYPRIPEDIE^E. Column appendaged by the petal-like sterile stamen. 



25. CYPRIPEDIUM. Lip large, inflated. Leaves large, plaited. 



