12 



KEY TO THE FAMILIES AND GENERA 



5, Pogonia Tribe. 



A. Fl-i. on a scaiX" with a terminal wliorl of If.-Uko 



bracts '. n. Isotria. 



AA. FIs. on a leafy st. 



B. Up crested 12. Pooonia. 



BB. Lip not crested 13. Triphora, 



6. Vanilla Tribe. 



Sts, rooting at nodes 14. Vanilki. 



7. Cephalanthera Tribe. 



A. Fls. with a chin; hp long 15. Cephalan- 



[thera. 

 A.V. Fls. chinless; lip round ' IG. Epipactis. 



8. Spiranthes Tribe. 



A. Dorsal sepal forming a hood with the petals. 



B. Infl. 1-sided; fls. without a chin 17. Spiranthes. 



BE. Infl. not 1-sided; tis. with a chin 18. Stenorrhyn- 



[chus. 

 AA. Sepals and petals spreading 19. Listera, 



9. Cranichis Tribe. 



Lip and petals inserted upon the elongated 



column 20. Fontkieoa. 



10. Physurus Tribe. 



A. Lip with a distinct spur. 



B. Lvs. green: Up concave above the spur 21. Physurus. 



BB. Lv;>. usually variegated: Up with a long 



fimbriate claw 22. Aiusdo- 



AA. Lip spurless or nearly so. [chilus. 



B. Column Straight; fls. symmetric. 



c. The Up not clawed 23. Goodyera. 



cc. The Up clawed 24. Dossinia. 



BB. Column twisted: fls. not symmetric. 



c. The column with 2 upright appendages in 



front 25. Maaxies. 



cc. The column without appendages 26. Hiemaria. 



11. Thunia Tribe. 



A. Fls without chin. 



B. Sts. without basal pseudobulbs 27. Thunia. 



BB. Sts. with basal pseudobulbs 28. BletUla. 



AA. Fls. with a distinct chin, formed of lateral 



sepals and column-foot 29. Trichosma. 



12. CcElogyne Tribe. 



A. Base of Up with sac-like hollow. 



B. Column short, winged above; sepals 6at 30. Pholidota. 



BB. Column slender; sepals sac-Uke, concave. .. .31. Neogyne. 

 AA. Base of Up flat. 



B. Column slender, without horns. 



c. Lvs. and pseudobulbs perennial 32. C'celogyne. 



cc. Lvs. and pseudobulbs annual 33. Pleione. 



BB. Column short, with 2 horns 34. Platyclinia. 



13. Liparis Tribe. 



A. Lvs. green: fls. without chin. 



B. Lip ahoe-shaped 35 Calypso. 



BB. Lip not shoe-shaped. 



c. Column short; Up turned upward 30. Microstylis. 



cc. Column slender; lip turned downward. . . .37. Liparis. 



AA. Lvs. wanting: fls. with chin 38. CoraUor- 



[rhiza. 



14. Polystachya Tribe. 



A. Lip Jipurred. 



B. Plant tuberous: spur slender 39. Tipularia. 



BB. Plant not tuberous: spur funnel-shaped 40. Galeandra. 



AA. Lip not spurred, 

 B. The Up ."J-lobed. 



c. Column short; chin distinct 41. Polystachya. 



cr. Column slender, curved; chin indistinct ..42. AnseUia. 



BB. The lip entire 43. Neoben- 



[thamia. 



15. Ponera Tribe 



A. Lip normal. 



B. r*t. •(lender, leafy; no pseudobulbs: poUinia 4 .44. TsorhHua. 



BB. St. a pseudobulb: p<'>IUnia H 45. Ccelia. 



AA. Lip forming a beaker-like cavity, with the 

 f-oliimn. or the former hollow at base. 



B. Young shoots at the apex of the old 40. Ilexixea. 



BB. Young shoots from base of old. 



c. Fls. in dense .spikes; poUinia 8 47. Arpophyl- 



[lum. 

 cc. Flfl. in short clusters; polUnia 4 48. Hartwegia. 



16. Cattleya Tribe. 



A. Anther not toothed, nor in an excavation. 

 B. PoUinia 4. 



c. Lip adnatc to the column, at least at its 

 base. 



D. Ovary produced into a hollow neck 49. Broughlonia. 



DD. Ovary not so produced 50. Epiden- 



CC. Lip free. [drum. 



D. The lip flat, with 2 elevations on upper 



side 5L Diacrium. 



DD. The lip enroUed about column, with 



no elevations 52. Cattleya. 



BB. PolUnia 5-7, some of them often abortive 53. Lselio- 



BBB. PoUinia 8. {cattleya. 



c. Stigma pitted upon the front of the 

 column; anther inclined. 

 D. Base of Up gradually merging into 

 blade. 

 E. Lip distinctly surrounding the 

 column ; sepals and petals not 



wavy 54. haelia. 



EE. Lip not as above; sepals and petals 



distinctly wavy 55. Schom- 



DD. Base of lip tightly encompassing col- [burgkia. 



umn, suddenly broadened into the 



broad blade 56. Brassavola. 



CC. Stigma running up on 2 extensions of the 



column-apex; anther erect 57. Sophronitis 



AA. Anther 2-toothed below, in an excavation in 



the column 58. Leptotes. 



17. Sobralia Tribe. 



A. St. many-lvd., not bulbous at base: lip not 



bearded 59. Sobralia. 



AA. St. 1- or 2-lvd. , bulbous at base : Up bearded ... 60. Calopogon. 



18. Pleurothallis Tribe. 



A. Lip turned upward ; lateral sepals united 



into a boat-shaped hood 61. Scapho- 



AA. Lip turned down. [sepalum. 



B. Sepals united 62. Masdevallia. 



BB. Sepals free, or the lateral only united. 



c. Dorsal sepal and petals attenuated into a 



club-shaped apex 63. Restrepia. 



cc. Dorsal sepal and petals not as above. . . .64. Pleurothallis 



19. Phajus Tribe. 



A. Lvs. not articulated to petiole. 



B. Lip free, encompassing the column .65. Phajus. 



BB. Lip adnate to column, the blade spreading. .66. Calanthe. 

 AA. Lvs. articulated to petiole. 

 B. Sepals and petals spreading. 



c. Lip with its base tightly inclosing the 



column, the blade spreading 67. Limatodes. 



cc. Lip not inclosing column. 



D. Fls. with distinct chin 68. Chysis. 



DD. Fls. without chin. 

 E. PolUnia 8. 



F. Middle lobe of Up not clawed 69. Bletia.. 



FF. Middle lobe of Up clawed 70. Spatho- 



[glottis, 



EE. PolUnia 4 71. Aplectrum. 



BB. Sepals and petals erect 72. Acantko- 



[phippium. 



20. Cyrtopodium Tribe. 



A. Fls. spurred or with sac-like base. 



B. Sepals narrower and less colored than petals. 73. Lissochilua. 



BB. Sepals and petals aUke or nearly so 74. Eulophia. 



AA. Fls. not spurred nor saccate. 



B. Lip only inserted on column-foot 75. Cyrtopodium. 



BB. liip and lateral sepals inserted on column- 

 foot. 



c. Chin distinct, rectangular 76. Warrea. 



cc. Chin indistinct, round 77. Eulophiella. 



21. Catasetum Tribe. 



A. FIs. perfect; column twisted 78. Mormodea. 



AA. Fls. of 2 or 3 forms; column not twisted. 



B. Column stout, straight; fls. with antennffl. . .79. Catasetum. 

 BB. Column slender, curved; fls. without 



antennee 80. Cycnochea. 



22. Lycaste Tribe. 



A. PolHnia upon a single stalk. 



B. Fls. globose 81. Anguloa. 



BB. Fls. with spreading sepals and petals. 



c. Stalk of polUnia long and narrow; fls. 

 1 to few. 

 D. Infl. of a single erect fl.; Up turned 



down 82. Lycaste. 



