280 CXXXIII. ORCHIDEZ (BROWN). [ Disa. 
narrowed from the middle to the base, unequally 2-lobed to the 
middle; posterior lobe linear-lanceolate, acute or obtuse ; anterior lobe 
much shorter than, and twice as broad as, the posterior, oblong or 
subquadrate, very obtuse or obliquely subtruncate, minutely crenulate. 
Lip about 3 lin. long, linear, acute. Anther erect, 1} lin. long, oblong. 
Rostellum transversely oblong or subquadrate, broadly rounded in front, 
with a minute tubercle on its face.—D. aurantiaca, Reichb. f. in Flora, 
1867, 98, 
Lower Guinea. Angola: Huilla; Morro de Lopollo, Welwitsch, 712! 713! 
7. D. Welwitschii, Beicht, f. in Flora, 1865, 181. Plant 1-2 ft. 
high, glabrous. Leaves of barren shoot 3-4 in. long, 5-6 lin. broad, 
or larger, strap-shaped, acute, glaucescent. Leaves of flowering stem 
subcoriaceous, sheath-like, as long as, or longer than the internodes, 
erect or appressed, lanceolate, acuminate. Spike 2-5} in. long, }-1} 
in. thick, very densely many-flowered. Flowers rather small, purple. 
Bracts shorter than, equalling, or longer than the flowers, 5-14 lin. 
long, 14-3 lin. broad, lanceolate, acuminate, yellowish. Dorsal sepal 
21-44 lin. long, 14-23 lin. broad, erect, rhomboid-oblong, subobtuse, 
cuneately narrowed from the middle to the base, concave; spur 
moderately slender, pendulous, 14—44 lin. long, straight. Lateral 
sepals spreading and slightly ascending, 24—44} lin. long, 14-3 lin. 
broad, elliptic or elliptic-oblong, obtuse, concave. Petals 14-4 lin. 
long, 1-2 lin. broad, unequally 2-lobed to the middle; posterior lobe 
subspathulate or obovate, obtuse or subacute, concave, orange; 
anterior lobe rather more than half as long as the posterior, broadly ear- 
shaped. Lip 2-44 lin. long, linear, acute. Anther erect, 14—24 lin. 
long, oblong. Rostellum short, truncate or emarginate, with a keel 
or tubercle between the anther-cells. 
eel Guinea. Angola: Huilla, Morro de Lopollo, 5000-5300 ft., Welwitsch, 
Mozamb. Dist. British Central Africa: Fwambo, S. of Lake Tanganyika, 
5000 ft., Carson, 7! 10! Nutt! Nyasaland ; between Kondowe and Karonga, 2000- 
6000 ft., Whtye, 343! Shire Highlands, near Blantyre, Last ! Buchanan, 313! and 
without precise locality, Buchanan, 288! 674! 
This species varies very much in its robustness and in the size of the flowers, but 
I can find no structural differences among the specimens examined. I have only 
seen the leaves of the barren shoots on the Angolan specimens, The colour of the 
flowers, Ze. is taken from the notes made by Dr. Welwitsch. 
8. D. Deckenii, Reichb. f. Otia Bot. Hamb.ii.105. Plant 7-13 1m. 
high, glabrous. Lowest leaves 6—8 in. long, 4-8 lin. broad, strap- 
shaped, acute, ascending; the rest gradually smaller, more or less 
spreading, acute or acuminate. Spike 1-2 in. long, densely many: 
flowered. Flowers small “ crimson” or “ vivid red-mauve ” (Johnston). 
Bracts equalling or shorter than the flowers, 4-8 lin. long, 2-3 
lin. broad, lanceolate, acuminate. Dorsal sepal 23 lin. long, 1 
lin. broad, erect, boat-shaped, hooded at the obtuse apex; Spur 
slender, 2} lin. long, straight or slightly curved, deflexed or 
pendulous, cylindrical or slightly thickened at the apex. Lateral 
