310 



OECHIDACEAE 



Flower typically solitary: stem with a 



single leaf. 

 Flowers several: stem with several leaves. 

 Lip clawed: column elongated: stigma 

 obscurely 3-lobed, with the middle 

 lobe reflexed, not thick and spongy 

 at the base: anther-connective con- 

 spicuous. 

 Lip sessile: column short: stigma prom- 

 inently 3-lobed, with the middle lobe 

 curved upward, thick and spongy 

 at the base: anther-connective mi- 

 nute. 

 Plants scapose: bracts foliaceous, whorled at the 

 top of the scape. 

 Lip grown to the base of the elongated column, 

 turned upward, with a short spur. 

 Lip enclosing the column: anther inclined to upright: 

 seed covered with a crust: vines. 

 Lip with a distinct sac at the base. 

 Anther as long as the rostellum or rarely with a long beak 

 and exceeding the rostellum. 

 Leaves fleshy; blades net-veined, seldom parallel- 

 veined, not plaited. 

 Pollinia not in distinct masses. 

 Lip turned outward. 



Median sepal and petals forming a hood. 



Lateral sepals united at the base into a long 



spur. 

 Lateral sepals free. 



Flowers in a one-sided inflorescence: 

 lateral sepals somewhat oblique, 

 the perianth horizontally spread- 

 ing. 

 Lip merely adherent to the column 

 or free and not embracing it: 

 stigma 2-cleft. 

 Lip adnate to the column and em- 

 bracing it: stigma entire. 

 Flowers in a uniform inflorescence: peri- 

 anth with a distinct spur. 

 Median and lateral petals similarly spreading, 

 free. 

 Lip turned upward. 



Lip and petals free, or adnate only to the 

 l^ase of the column. 

 Sepals free: petals not dilated above: lip 



narrow. 

 Sepals united at the base: petals dilated 

 above: lip broad. 

 Lip and petals with claws wholly adnate to the 

 column. 

 Pollinia in several distinct masses. 



Lip with an extended spur or sac between the lateral 



sepals: column short. 

 Lip spurless or with only a short sac which is sur- 

 rounded by the lateral sepals. 

 Leaves firm; blades plaited. 

 Leaves duplicate in the bud. 



Sepals similarly developed with the petals. 

 Leaves not plaited. 



Leaves commonly not articulated: pollinia unap- 

 pendaged. 

 Stem leafy: column with a foot. 



Anther upright: column short: lip turned 



upward. 

 Anther inclined, deciduous: column long. 

 Stem without leaves: foot of the column forming 

 together with the lateral sepals a sac. 

 Leaves commonly articulated to the petioles or 

 sheathing bases: pollinia with tails or stipes. 

 Column with a distinct foot; pollinia 2 or 4, wax- 

 like, attached to the glands by very short stipes. 

 Column without a foot, the lip much larger than the 

 sepals. » 



Lip partially adnate to the column. 

 Lip free from the column. 

 Leaves plaited or wanting. 



Stem slender, from a bulb or corm: leaves present: 



lip with small lateral lobes and a broad or long 

 middle lobe. 

 Flowering stem not scaly: lip not spurred, with a 



broad middle lobe: capsule erect. 

 Flowering stem scaly: lip spurred, with a narrow 

 middle lobe: capsule nodding. 

 Stem stout, from ringed, somewhat coralline, rootstocks: 

 leaves wanting: lip with large lateral lobes. 



11. POGONIA. 



12. Triphora. 



13. Carteria. 



14. ISOTRIA. 



15. Arethusa. 



16. Vanilla. 



17. Serapias. 



18. Pelexia. 



19. Iridium. 



20. Beadlea. 



21. Stenorrhynchus. 



22. Ophrys. 



23. Cranichis. 



24. Prescottia. 



25. ponthieva. 



26. Physurus. 



27. Peramium. 



28. corymbis. 



29. Malaxis. 



30. LiPARis. 



31. CORALLORHIZA. 



32. POLYSTACHYA. 



33. Epidendrum. 



34. Hormidium. 



35. I>IMODORUM. 



36. TiPULARIA. 



37. Hexalectris. 



