Lissochilus,^ 



CXXXIII. ORCHIDEiE (rOLFE). 



71 



ffPetals 3 lin. or more broad. 



Disc with three crenulate keels or lamellae. 

 Western species. 



Lip subpandurate or rhomboid-oblong. 

 Spur conical-saccate, 2| lin. long 

 Spur "cupulate, rounded," minute . 

 Lip 3-lobed ... 

 Eastern or Central African species. 



Bracts subobtuse .... 

 Bracts acute or apiculate 

 Disc of lip densely villous-scabridulous 

 **Sepal8 ligulate to elliptical-oblong, not distinctly 

 broadest towards the apex. 

 Keels of lip crested. 



Spur broadly conical ..... 

 Spur narrowly conical. 



Inner pair of keels gibbous at the base 

 Inner pair of keels semicircular and slender 

 at the base , . 



Keels of lip thickened or slender, but not crested 

 Keels of lip flexuose ..... 

 Keels of lip straight. 



Keels of lips thickened nearly to the apex. 



Lip tritid 24. L.fallax. 



Lip pandurate. 



Keels of lip about seven . . .25. 

 Keels of lip about three . . . 26. 



Keels of lip obscure or thickened only at 

 the base. 

 Spur over \ as long as the lip . . 27. 



Spur scarcely 5 as long as the lip . 28. 



Petals broadly ovate- orbicular or orbicular-elliptical 

 {see also 18. i. latus). 

 *Front lobe of lip usually flat or nearly so j petals 

 white or purple. 

 Bracts subulate-lanceolate, acuminate. 



Disc of lip with a pair of calli in front of the spur. 

 Leaves elongate-linear. 



Calli of lip obovate or oblong . . . 29. 



Calli of lip linear 30. 



Leaves lanceolate or linear-lanceolate. 

 Calli of disc quadrate. 



Sepals acuminate .... 31. 



Sepals subacute .... 32. 



Calli of disc styliform-capitato . . 33. 



Disc of lip without calli ..... 34. 



Bracts ovate or broad. 



Upper part of spur long and narrow or acute. 

 Bracts and sepals acuminate. 



Keels of lip rather dwarf and slender 



i. livlngstonianus. 

 L. affinis. 



L. cornigerv.s, 

 L. mediocris. 



L. arenarius. 

 L. Roscheri. 



L. dilectus. 

 L. Monteiroi. 

 L. stylites. 

 L. Buettneri. 



35. L. Horsfallii. 



Keels of lip elevated into tall crenulate 

 lamellae. 

 Spur acuminate ..... 36. 

 Spur acute . . . . .37. 



Bracts and sepals obtuse or apiculate. 



L. porphyroglossus. 

 L. Sandersoni. 



