82 



OBCHIDACEAE. 



Anther, at least the body, about as long as the rostel- 

 lum and not appressed to it, when beaked, the 

 beak sometimes exceeding the rostellum. 

 Pollinia not in distinct masses. 

 Lip turned outward. 



Lateral sepals united at the base into a 



long spur. 

 Lateral sepals free. 



Flowers in a 1-sided spike which is 

 sometimes spirally twisted, the peri- 

 anth spreading or noddjng ; lip not 

 saccate. 

 Flowers in a many-sided spike, the peri- 

 anth ascending or erect ; lip saccate at 

 the base. 

 Lip turned upward. 



Sepals united at the base; lip adnate to the 

 sepal-tube, the base free from the short 

 column. 

 Sepals free: lip free from the sepals, the 

 base adnate to the elongate column. 

 Pollinia in several distinct masses. 

 Leaves duplicate. 



Leaf-blades not plaited. . . 



Leaves not articulated near the base; pollinia un- 



appendaged. 

 Leaves articulated near the base ; pollmia with tail- 

 like appendages. , , ^ 

 Column with a distinct foot; lip and lateral 



sepals about equal in size. 

 Column without a foot; lip much larger than 

 the lateral sepals. 

 Ovary not produced into a hollow neck. 

 Pollinia 4. 



Plants without pseudobulbs. 



Flowers axillary to bracts borne 



along a rachis. 

 Flowers in a terminal raceme or 

 panicle or solitary. 

 Plants with pseudobulbs. 



Lip 3-lobed. longitudinally crested 

 or appendaged ; sepals and 

 petals not attenuate. 

 Lip deeply 3-lobed, the middle 

 lobe broad ; pseudobulbs 

 terete ; scape without a 

 long basal sheath. 

 Lip obscurely 3-lobed, the mid- 

 dle lobe minute ; pseudobulbs 

 flattened ; scape with a long 

 basal sheath. 

 Lip entire, or undulate, neither 

 crested nor appendaged. 

 Lip concave, shell-like. 

 Lip nearly linear. 

 Pollinia 8. 

 Ovary produced into a hollow neck. 

 Leaf-blades plaited. 

 Flowering stem or peduncle lateral. 



Leaves convolute; column elongate. , .« r.-p 



Column without a foot; lip attached to the base of 



the column: lateral sepals free. 

 Column with a distinct foot : lip attached to the apex 

 of the foot ; lateral sepals adnate to the column-foot. 

 Leaves duplicate ; column very short. 



3. Pelewia. 



4. Ihidium. 



5. Stenorrhynchus. 



6. Prescottia. 



7. Ponthieva. 



8. Physurus. 



9. MaJaxis. 



10. Polystachya. 



11. Spathigcr. 



12. Auliza. 



13. EncycUa. 



14. Epiclacliiim. 



Id. Anacheilium. 

 10. Nidema. 

 17. Tetramicra. 

 IS. Laeliopsis. 

 19. Limodorum. 



20. Bletia. 



21. Govenia. 



22. OnckUum. 



1. CAETERIA Small, Torreya 10: 187. 1910. 

 Caulescent terrestrial orcliids ^ith clustered, fleshy tubers and erect simple 

 stems. Leaves various, the basal ones firm, narrow, with plicate blades, the 

 cauline ones mere sheathing scales. Flowers several, erect, axillary to scale- 

 like bracts. Perianth colored. Sepals nearly equal, narrow, longer than the 

 petals. Petals decidedly narrower than the sepals. Lip short, sessile, slightly 



