152 



CXXXIII. ORCHIDE^ (rOLFE). 



[Listrostachys. 



Flowers small or rarely mediiixn-sized (un- 

 known in 48). Spur usually more or less clavate 

 or vesicate at the apex, seldom ^ in. long. 

 *Stems more or less elongated and climbing (unknown 

 in 21). 

 Lip pandurate or subpandurate. 



Spur clavate, slightly longer than the sepals . 

 Spur slender, nearly twice as long as the sepals 20 

 Lip ovate-oblong or obovate. 

 Lip truncate-emarginate 

 Lip acute or cuspidate. 



Spur slender ..... 

 Spur subclavate .... 

 Lip very broad, shortly trilobed in front 

 Lip orbicular or suborbicular 

 **Stems usually short and stout, or not climbing. 

 fLeaves flat. 



Flowerg in elongated racemes. 



26. 

 27. 



L. pertusa. 

 L. clandestina. 



28. L. gahonensis. 



29. L. muliijlora. 



Flowers and bracts alternate. 

 Racemes dense. 



Spur strongly clavate. 



Lip entire, flat or nearly so . 

 Lip trilobed with erect side lobes 

 Spur scarcely thickened upwards. 

 Leaves 10 lin. broad . , 

 Leaves 4 lin. broad 

 Racemes lax. 



Spur not, or scarcely, exceeding the 

 lip. 

 Disc of lip with a small basal tooth 30. L. pellucida. 

 Disc of lip without a basal tooth . 31. L. dimtijlora. 

 Spur twice as long as the lip. 

 Spur 4r-5 lin. long. 



Leaves l|-2 in. broad . . 32. 



Leaves 5-7 lin. broad . . 33. 

 Spur 8 lin. long . . . 34. 



Flowers and bracts opposite. 



Spur more tlian twice as long as the 

 segments ..... 

 Spur about as long as the segments. 

 Sepals and petals 5-6 lin. long, acu- 

 minate. 

 Spur abruptly dilated on one side, 



l.j lin. broad 

 Spur clavate, 1 lin. broad . 

 Sepals and petals 3 lin. long, acute . 

 Flowers and bracts verticillate 

 Leaves very narrow, 1-1 ^ li"- broad. 

 Sepals ovate or triangular 

 Sepals very narrow and acuminate . 

 Flowers in dense, capitate heads. 

 Leaves 7-8 in. long. 

 Lip cuneate at the base 

 Lip hastate ..... 



L. ragans. 

 L. thomensis. 

 L. ichneumonea. 



35. L. vesicata. 



36. L.fragrantissima. 



37. L. Welwitschii. 



38. L. Kirkii. 



39. L. urostachya. 



40. 

 41. 



Virgula. 

 graminifolia. 



42. L. capitata. 



43. Z. cephalotes. 



