Holothrix. | CXXXIII. ORCHIDEE (ROLFE), 195 
Flowers white, 14—14 in.long. Sepals triangular, acuminate, 1-nerved ; 
margin ciliate. Petals much longer than the sepals, basal part linear, 
4 in. long; upper part divided into many filiform segments. Lip a little 
longer, and twice as broad, in other respects similar to the petals, the 
entire base and the segments each 7-8 lin. long; spur short, slightly 
recurved, obtuse. Column broad, acute; base with a pair of broad 
lamelle. 
Lower Guinea. Angola: Huilla, Muscha, in dry soil, Newton. 
Only known to me from the original description, but must be nearly allied to the 
preceding. 
14. H. Lastii, Rolfe. Scapes 9 in. or more long (base not seen), 
ferruginous, pubescent. Racemes 2 in. long, few- to many-flowered. 
Bracts ovate-lanceolate, acuminate, 3-4 lin. long. Sepals ovate-lanceo- 
late, acuminate, 2 lin. long. Petals cuneate-oblong, 7—8 lin. long, the 
upper half broken up into about 7 long, subfiliform segments. Lip 
similar, but broader and with more numerous segments. Column short 
and stout. 
Mozamb. Dist. British Central Africa: Nyasaland; Shire Highlands, near 
Blantyre, Last ! 
A distinct but imperfectly known species. 
32. DERGEMERIA, Reichb. f. De Poll, Orch. 29. 
Sepals subequal, connivent, herbaceous, usually glabrous. Petals 
longer than the sepals or subequal, narrow, entire or somewhat divided 
at the apex. Lip adnate for a long distance to the column, erect, con- 
cave or involute at the sides, entire or somewhat lobed, produced at the 
base into a curved spur. Column short, usually auricled at the sides of 
the stigma; clinandrium erect, broad, concave, or almost cucullate ; 
connective of the anther not distinct from the clinandrium ; cells ovoid, 
adnate, distinct, included; pollinia coarsely-grained, with very short 
caudicles, terminating in a small naked gland ; stigma sunk within the 
tube formed by the union of the lip and column. Terrestrial herbs 
leafless at the flowering time or with a large orbicular radical leaf, 
pes stout, glabrous or hairy, and with numerous lanceolate, acu- 
minate, often imbricate, sheaths. Flowers small, usually in dense or 
unilateral spikes. 
A genus of eight species, peculiar to Tropical Africa, with the exception of one 
Arabian representative. Bentham reduces it to Habenaria, but it is much nearer to 
Holothriz, chiefly differing in the very distinct habit, and in the greater union of the 
auricled lip to the column, the stigma being sunk in the tube thus formed. In several 
Cases radical leaves are not known, presumably because they wither before the flowers 
appear, as is known to occur in D. Schimperi and D. unifolia. 
Lip entire , e > i : i H . . 1. D. squamata, 
Lip more or less distinctly trilobed or tridentate. 
Petals spathulate, obtuse or obscurely trilobed . . 2. D. montigena, 
Petals ovate, acuminate, sometimes obscurely toothed 
near the apex . S S > b S . 3. D. acuminata, 
