264 CXXXIII. ORCHIDEA (ROLFE). [Satyrium. 
Lip with basal fourth united to the 
lateral sepals ` : ` . 14. S. Krenzlinii, 
Bracts not reflexed after flowering (Angolan 
species) . S c S . 15. S. mechowianum. 
Lip 23-4 lin. long, somewhat membranous. 
Lip as broad as long < S SG . 16. S. coriophoroides. 
Lip longer than broad. 
Spurs as long as or longer than the lip. 
Sepals more or less distinctly longer 
tban the lip. 
Spikes dense (Eastern species). 
Lip 33-4 lin. long. 
Spurs twice as long as the 
sepals. S . 17. S. densum. 
Spurs slightly longer than the ` 
sepals S . 18. S. Buchanani. 
Lip 2-23 lin, long. 
Spurs not twice as long as the 
sepals, 
Lip strongly constricted be- 
low the reflexed apex . 19. S. Kirkii. 
Lip scarcely constricted below 
the suberect apex . 20, S. niloticum. 
Spurs twice as long as the sepals 
or more . 21. S. crassicaule. 
Spikes rather lax (Angolan species) 22. S. Ivantale. 
Sepals more or less distinctly shorter 
than the lip(Abyssinian species). 
Spurs 5-6} lin. long . =.  . 23. S. brachypetalum. 
Spurs 25-3 lin. long . : . 24. S. Schimperi. 
Spurs not or scarcely as long as the lip. 
Lip 3-4 lin. long. 
Lip over half as broad as long . . 25. S. zombense. 
Lip half as broad as long S . 26. S, occultum. 
Lip 2-23 lin. long . : : . 27. S. Nuttii. 
Lip 6 lin. long : ` ` : . 
a Are two short, obtuse sacs, much shorter than the 
imb. 
Sepals and petals 5-6 lin. long. 
Column 3 lin. long i : SE . 29. S. breve. 
Column 2-24 lin. long. 
Spurs 1-14 lin. long. |. í h . 80. S. leucocomos. 
Spurs scarcely 4 in. long . S . 31. S. paludosum. 
Sepals and petals 2 lin. long. S 2 . 32. S. longibracteatum. 
** Lip without a sac. S S S art . 33. S. Mechowit. 
28. S. Welwitschii. 
1. S. bifolium, A. Rich. in Ann. Sc. Nat. sér. 2, xiv. 273, t. 18, 
fig. 2. Tubers ovoid-oblong, 7-13 lin. long. Plant 14-1} ft. high, 
with two suborbicular horizontal leaves at the base, and five to seven 
oblong-lanceolate, subobtuse sheaths above. Leaves 2-4 in. broad. 
Racemes oblong, 24-41 in. long, rather dense. Bracts ovate or ovate- 
lanceolate, acute, 9-14 lin. long. Pedicels 5—6 lin. long. Sepals 7-9 
lin. long; odd one cuneate-oblong, obtuse; lateral much broader. 
Petals united for a fifth of their length to the sepals, narrower than 
