280 cxxxiii. ORCHiDEiE (bbown). [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 J lin. long, oblong. 

 R-ostellum transverselyoblong or subquadrate, broadly rounded in front, 

 with a minute tubercle on its face. — J), aurantiaca, Reichb. f . in Flora, 

 1867, 98. 



Iiower Culnea, Angola : Huilla ; Morro de LopoUo, Welwitsch, 712 ! 713 ! 



7. D. ^Welwitschii, Meichh.f. in Flwa, 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, f-lj 

 in. thick, very densely many -flowered. Flowers rather small, purple. 

 Bracts shorter than, equalling, or longer than the flowers, 5-14 lin. 

 long, lJ-3 lin. broad, lanceolate, acuminate, yellowish. Dorsal sepal 

 2|-4| lin. long, 1J-2| lin. broad, erect, rhomboid-oblong, subobtuse, 

 cuneately narrowed from the middle to the base, concave; spur 

 moderately slender, pendulous, 1J-4|^ lin. long, straight. Lateral 

 sepals spreading and sUghtly ascending, 2J-4J lin. long, lJ-3 lin. 

 broad, elliptic or elliptic-oblong, obtuse, concave. Petals lJ-4 lin. 

 long, 1-2 Hn. 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 2-4|^ lin. long, linear, acute. Anther erect, 1^-2 J lin. 

 long, oblong. Rostellum short, truncate or emarginate, with a keel 

 or tubercle between the anther-cells. 



Iiower Guinea. Angola : Huilla, Morro de LopoUo, 5000-5300 ft., Welwitsch, 

 715! 



Mozamb. Dlst. British Central Africa : Fwambo, S. of Lake Tanganyika, 

 5000 ft., Carson, 7 ! 10 ! Nutt ! Nyasaland ; between Kondowe and Karonga, 2000- 

 6000 ft., Whtye, 343 ! Shiie 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. 1 ha\^e only 

 seen the leaves of the barren shoots on the Angolan specimens. The colour of the 

 flowers, &c., is taken from the notes made by Dr. Welwitsch. 



8. D. Deckenii, Reichh.f. Otia Bot. Hamh. ii. 105. Plant 7-13 in. 

 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 

 Un. broad, lanceolate, acuminate. Dorsal sepal 2 J Hn. long, 1 

 lin. broad, erect, boat-shaped, hooded at the obtuse apex ; spur 

 slender, 2 J lin. long, straight or slightly curved, deflexed or 

 pendulous, cylindrical or slightly thickened at the apex. Lateral 



