cxxxiii. ORCHiDEiE (rolfe). [LissochUits, 



Spur conical. 



Disc of lip three-keeled. 



Disc of lip without basal calli . . 38. i. roseus. 

 Disc of lip with a pair of semicircular 



calli behind . . . . 39. Z-. Ephippilum. 



Disc of lip with a single dwarf callus 



behind ..... 40. L. Alexandri, 



Disc of lip five-keeled . . . .41. L.Nyasce. 



Spur inflated underneath near the base . 42. L. macranthus . 

 Upper part of spur rather short and blunt. 

 Keels of lip rather dwarf and entire. 



Petals f-1 in. broad ; front lobe of lip 



4r-6 lin. broad . . . . . 43. L. elatus. 



Petals 1-1:1^ in. broad ; front lobe of lip 8-9 



lin. broad ..... 44. L. giganteus. 



Keels of lip elevated into tall crenulate lamellee. 



Front lobe of lip longer than broad, subacute 45. L. Welwitschii. 

 Fropt lobe of lip broader than long, obtuse. 



Disc of lip with five lamella) . . . 46. L. Schiceinfurthii. 



Disc of lip with three lamellae . . 47. L, Elliotii. 



^Front lobe of lip convex or with reflexed sides ; petals 

 usually bright yellow, sometimes marked with 

 brown or red. 

 Disc of lip with a pair of erect calli in front of the 



spur ....... 48. L. congoensis. 



Disc of Up with a transverse membrane at the base 



of the front lobe ...... 49. L. Frederici. 



Disc of lip smooth or longitudinally keeled. 

 fSepals as long as the petals, or nearly so. 



Bracts broadly ovate and subobtuse . . 50. L. Oatesii. 



Bracts oblong or lanceolate and acute. 



Spur slender, acute . . . . . 51. i. malanganus. 



Spur rather stout, subobtuse. 

 Spur straight, or nearly so. 

 J Expanded flowers 1 in. or more diani. 

 Spur 2 lin. long, nearly as long as 

 the side lobes of the lip. 

 Sepals about half as broad as long. 

 Spur tapering almost to the 

 apex. 

 Petals rhomboid-ovate (West- 

 ern or central species). 

 Side lobes of lip broadly 

 oblong or snborbicular- 

 oblong . . . 52. L. paivceanus. 



Side lobes of lip ligulate . 53. L. renschianus. 

 Petals ovate (Eastern species) 54. L. papilionacetts. 

 Spur stout to near the apex . 55. L. Carsoni. 

 Sepals more than half as broad as 



long 56. i. Grantii. 



Spur about 1\ lin. long, half to a 

 third as long as the side lobes. 

 Expanded flowers 1\ in. diam. 

 Disc of lip three-keeled to near 



the apex , . . h7. L. ErythrcecB. 



