Listrostachys.~\ 



CXXXIII. ORCHIDE^ (rOLFE). 



151 



wings, footless ; clinandrium truncate, entire. Anther terminal, oper- 

 culate, incumbent, convex, often produced in front, scarcely 2 -celled ; 

 pollinia 2, globose, sulcate, situated upon a pair of usually slender 

 stipites, distinct or only united at the base, where they are attached to a 

 single variously-shaped gland. Capsule oblong or fusiform. — Epiphytic 

 herbs. Stems leafy, usually short, not thickened into pseudobulbs. 

 Leaves distichous, coriaceous or fleshy, articulated to a persistent 

 sheath. Peduncles lateral, simple. Flowers i-acemose or capitate, very 

 various in size. Bracts small or medium-sized. 



A genus of 60 or more species, most numerous in Tropical Africa, with one South 

 African representative and several in the Mascarene Islands. In its pollinary appara- 

 tus it is intermediate between AngrcBciim and Mystacidium, though distinct from 

 both. 



Flowers larg-e or medium-sized (unknown in 7). 

 Spur long -and slender, or tapering to the apex, 

 rarely reduced to 5 lin. long. 

 Spur 9-10 in. long ...... 



Spur 4-5^ in. long ...... 



Spur 1-3 in. long. 

 *Spur tapering to the apex from a stout base. 

 Leaves oblong or linear-oblong. 



Racemes equalling or scarcely exceeding the 

 leaves. 

 Spur slightly curved. 

 Rostellum beaked. 

 Western species. 



Leaves 1|— 1^ in. broad ; bracts 



9-11 lin. long 

 Leaves ^f in. broad; bracts 

 3-4 lin. long 

 Eastern species. 



Leaves f in. or more broad. 

 Bracts 4-5 lin. long 

 Bracts 8-9 lin. long 

 Leaves \ in. broad 

 Kostellum short and not beaked . 

 Spur much curved or hooked near the 

 apex. 

 Spur bent in the middle, forming a 

 loop. 

 Leaves |— 1^ in. broad . 

 Leaves 5-6 lin. broad 

 Spur suddenly hooked near the apex . 

 Racemes distinctly longer than the leaves. 



Spur curved, l^j-lf in. long . . . 12. 



Spur straight, about 11 lin. long . . 13. 



Leaves narrowly linear ..... 14. 



**Spur slender from the base. 



Leaves narrowed at the apex , .15. 



Leaves with broad obtuse apex . . .16. 



Spur 5 lin. long. 



Spur hooked about the middle , . . . 17. 



Spur nearly straight ..... 18. 



L. caudafa, 

 L. chailluana. 



L. acuminata. 

 L. HooJceri. 



L. Sedeni. 

 L. Whyiei. 

 L. Erythrcece. 

 L. ring ens. 



9. 

 10. 

 11. 



L. historta. 

 L. Aschersoni. 

 L. trachypus. 



L. Monteirce. 

 L. huchholziana. 

 L. henriquesiana. 



L. engleriana. 

 L. muscicola. 



L. rhipsalisoeia, 

 L. Wiftmackii. 



