Lustrostachys. } CXXXIII. ORCHIDEÆ (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 racemose 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. ïn its pollinary appara- 
$ S is intermediate between Angraecum and Mystacidium, though distinct from 
oth. 
Flowers large 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. Jong 
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 14-15 in. broad; bracts 
1. L. caudata. 
2. L. chailluana. 
9-11 lin. long. d . 3. L. acuminata, 
Leaves 3-3? in. broad; bracts 
3—4 lin. long - ` . 4, D. Hookeri. 
Eastern species. 
Leaves 3 in. or more broad. 
. 18. L. Wittmackit. 
Bracts 4—5 lin. long 5. L. Sedeni. 
Bracts 8-9 lin. long 6. L. Whytei, 
Leaves 4 in. broad 7. L. Erythree. 
Rostellum short and not E 8. L. ringens. 
Spur much curved or hooked near the 
apex. 
Spur bent in the middle, forming a 
loop. 
Leaves 3—14 in. broad . 5 . 9. L. bistorta. 
Leaves 5-6 iin, broad . . 10. Z. Aschersoni. 
Spur suddenly hooked near the apex . 11. L. trachypus. 
Racemes o longer than the leaves. 
Spur curved, 14—14 in. long . ; . 12. L. Monteire. 
Spur straight, about 11 lin. Kee . . 13. L. buchholziana. 
Leaves narrowly linear . > . 14. L. henriquesiana, 
**Spur slender from the base. 
Leaves narrowed at the apex S 15. L. engleriana. 
Leaves with broad obtuse apex. . . 16. L. muscicola, 
Spur 5 lin. long. 
Spur hooked about the middle . S : . 17. L. rhipsalisocia. 
Spur nearly straight 
