Polystachya?[ cxxxiii. orchidile (rolfe). 107 



Front lobe of lip suborbi- 



cular . . . 54. P. lawrenceana. 



ft Leaves 4 in. or more long, 

 or proportionally nar- 

 row. 

 Pseudobulbs ovoid or nar- 

 row (unknown in 

 57). 

 Callus of lip absent . 55. P. Jlolsiii. 

 Callus of lip carinate. 

 Inflorescence pube- 



rulous . . 56. P. KirJcii. 



Inflorescence villous 57. P. villosa. 

 Callus of lip senii- 



quadrate . . 58, P. dixantha, 



• Pseudobulbs dorsally flat- 



tened . . .59. P. affinis. 



Scapes 1-Jloioered . . . . . 60, P. ccesjpiiifica. 



Flowers over f in. long. 



Lip nearly straight 61. P. grandifiora. 



Lip abruptly reflexed about the middle . 62. P. reflexa. 

 Crest of lip large, 4-6-lobed. 



Plant 3-6 in. high ; flowers paniculate . . 63. P. Preussii. 



Plant about 2 in. high ; flowers solitary . . 64. P. alpina. 



Ehachis zigzag. 



Stems with a single oblong-linear leaf . . 65. P. diaiicha. 



Stems with oblong-lanceolate leaves , . . QQ. P. caloglossa. 



Lip very long, narrow, and doubly curved . . . 67. P. elastica. 



Pseudobulbs or steins slender, superposed. 

 Flowers paniculate. 



Leaves oblong or oblong-lanceolate . . . 68. P.fuxiformis. 



Leaves linear or lanceolate-linear . . . . 69. P. superposita. 



Flowers racemose. 



Claw of lip densely setose . . . . .70. I*, spatella. 



Claw of lip smooth. 



Stems and leaves 2\-i> in. long . . . 71. P. jElliotii. 



Stems and leaves \~1\ in. long . . . 72. P. ruioenzoriensis. 



Pseudobulbs ovoid, distantly arrangred on a 

 slender creeping- rhizome. 

 Petals minutely tubereulate ; front lobe of lip larger 



than the side lobes . . . . . . 73. P. lidhophylloides . 



Petals minutely setose; front lobe of lip nearly 



obsolete ........ 74. P. micropetala. 



1. P. leonensis, Reichb. /. Otia Bot. Hamh. ii. 112. Pseudobulbs 

 globose, depressed, J' in. diam., closely arranged along the rhizome; 

 roots densely white-velvety ; apex about 3-G -leaved. Leaves lanceolate 

 or oblong-lanceolate, acuminate, 3-8 in. long, G-13 lin. broad. Scapes 

 G-9 in. long, puberulous ; racemes simple, lax, many-flowered. Bracts 

 acuminate from a broad triangular base, f-1 lin. long. Pedicels 4-5 

 lin. long. Flowers light-green, sometimes suffused with brownish- 

 purple ; lip white, with some purple on the side lobes behind. Dorsal 

 sepal ovate, obtuse, 1^-2 lin. long; lateral broadly triangular, ovate, 

 obtuse. Petals oblong, obtuse, 2 lin. long. Lip trilobed, 3 lin. long ; 



