27G 



CXXXIII. ORCHIDE^ (bROWn). 



[Disa. 



1. D. Carsoni. 



eruhescens. 

 zombica. 



2. B. 



3. JD. 



clavate, or narrowly ellipsoid. — Terrestrial herbs, with simple sessile 

 tubers. Leaves appearing with or before the flowers ; the larger foliage- 

 leaves often produced on a distinct growth from that which bears 

 flowers ; those of the flowering stem often reduced to sheaths. Flowers 

 large or small, solitary, corymbose, racemose, or in dense or lax spikes, 

 bracteate. 



Species about 130, mostly South African, a few in Madagascar. 

 *Dorsal sepal spathulate, with a distinct channelled claw. 

 Anther erect. 

 Dorsal sepal 1^-2 in. long. Apical part of petals 



linear, 2-3' times as broad as the middle part 

 Dorsal sepal about 1 in. long. Apical part of petals 



linear, scarcely broader than the middle part 

 Dorsal sepal 7-8 lin. long. Upper part of petals 

 linear-spathulate ...... 



**Dor8al sepal not ' spathulate and without a claw, but 

 sometimes cuneately narrowed to the base. 



Anther erect. Dorsal sepal concave or boat-shaped ; 

 spur 1^4| lin. long, pendulous from its base. 

 Lip linear with a tooth on each side at its base . 4. J), scutellifera. 

 Lip linear without teeth at its base. 

 Petals 2-lobed. 



Spike 5-8 in. long, f-1 in. thick. 



Posterior lobe of petals linear, sigmoid, 



obtuse 5. -D. Schimperi. 



Posterior lobe of petals linear-lanceolate, 



acute . . . • . . Q. D. ochrostachya. 



Spike 1-5 in. long, |-1| in. thick, very 

 dense. Posterior lobe of petals sub- 



spathulate or obovate . . . 7. 2>. Welwitschii. 



Petals entire, lanceolate, acute . . . 8. D. Beckenii. 



Anther horizontal. Dorsal sepal hood-shaped ; spur 



8-9 lin. long, pendulous from its base . . 9. J>. Stairsii. 

 Anther horizontal. Dorsal sepal helmet or ex- 

 tinguisher-shaped; spur usually with a broad 

 conical base, ascending, horizontal, or re- 

 curved (subpendulous in B. versicolor). 

 Lip entire. 



Spur slender, several times longer than its 

 apical diameter. 

 Spur straight. 



Flowers under f in, in diam. 



Spur 2|-3 lin. long. Petals oblong, 

 obtuse ..... 

 Spur 1 in. long. Petals obovate or 

 spathulate, obtuse 

 Flowers about 1 in. in diam. Spur 1-1^ 

 in. long, petals falcate, acute . 

 Spur curved or subpendulous. 



Flowers large, more than f in. in diam. 



Petals linear, falcate, obtuse 

 Flowers small. 



Petals obovate or spathulate, obtuse . 11. B. 

 Petals rhomboid-oblong, acute . . 14, B. 



10. B. saxicola. 

 . 11, B. Emini. 



12. B. robusta. 



13, B. Walleri. 



Emini. 

 hircicornis. 



