310 



OBCHIDACEAE 



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 



base 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: 



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. 



pollinia unap- 



11. POGONIA. 



12. TRIPHORA. 



13. CARTERIA. 



14. ISOTRIA. 



15. ARETHUSA. 



16. VANILLA. 



17. SERAPIAS. 



18. PELEXIA. 



19. IBIDIUM. 



20. BEADLEA. 



21. STENORRHYNCHUS. 



22. OPHRYS. 



23. C RANI cms. 



24. PRESCOTTIA. 



25. PONTHIEVA. 



26. PHYSURUS. 



27. PERAMIUM. 



28. CORYMBIS. 



29. MALAXIS. 



30. LIPARIS. 



31. CORALLORHIZA. 



32. POLYSTACHYA. 



33. EPIDENDRUM. 



34. HORMIDIUM. 



35. LlMODORUM. 



36. TlPULARIA. 



37. HEXALECTRIS. 



