196 xc. convolvulace.e (baker, and rendle). [Iponioea. 



petiole h in. long. Flowers solitary, on short pedicels, or up to 

 4 on a short-peduncled raceme-like inflorescence ; bracts linear to 

 linear danceolate, acute, about § in. long. Sepals subequal, lanceo- 

 late, long acute, 8-10 lin. long, densely silvery silky on the outside. 

 Corolla 3-4ijr in. long ; tube cylindrical ; limb funnel-shaped, about 

 1^ in. in diam., scarcely lobed ; tube and midpetaline areas of limb 

 silky outside. Capsule globose, rather hairy. Seeds 3, 1 in. long and 

 broad, clothed with long shining clear brown hairs. — I. Marlothii, Engl. 

 Jahrb. x. 244. Rivea adenioides, Hallier f. in Engl. Jahrb. xviii. 156. 



Lower Guinea. German South-west Africa : Hereroland ; Usaka, 3000 ft., 

 Marloth, 1250. Ambolancl ; Otnbalambuenge, Rautanen, 160! Korikas Flag, 

 Belch, 21. Near Otyitambi, Gilrich, 10; iAlderitz, 116. 



Mozamb. Bist. British Central Africa: Lake Ngami, McCabe, 44 ! Northern 

 Kalahari Desert; near Cliukntsa Salt-pan, Lugard, 224 ! near Palapye, Lugard, 

 265! 



Var. ovato-lanceolata, Hallier f. in Ann. Istit. Bnt. Roma, vii. 235. Leaves 

 ovate-lanceolate, generally acute, with somewhat obtuse base, up to 3i in. long by Ik 

 in. broad. 



MTile Xoand. Somaliland : Nogal, Robecchi-Bricchetti, 499. 



142. I. kituiensis, Vatkein Linncea, xliii. 511. Perennial, shrubby. 

 Stems erect or climbing, hollow, up to |- in. thick, pubescent, leaf-scars 

 prominent. Leaves reniform-cordate, very obtuse, shortly apiculate, 

 reaching nearly 6 in. in width, clothed with adpressed hairs beneath, 

 similarly but sparsely hairy or glabrous above ; petioles pubescent, 

 varying in length, often as long as or longer than the leaves. Peduncles 

 rigid, robust, terete, pubescent, up to 6 in. long, bearing a diffuse corym- 

 bose dichasium ; flowers more or less crowded ; bracts linear, acute, 

 about tj in. long, covered with white silky hairs like the sepals. Sepals 

 tapering upwards, acute, unequal, the outer above ^ in. long. Corolla 

 funnel-shaped, rose-purple, passing into white above, 2-3 in. long, 

 thinly silky on the well-defined midpetaline areas. Capsule J in. in 

 diam. ; seeds long hairy. — Hallier f. in Engl. Jahrb. xxviii. 53. /. 

 tambelensis, Baker in Kew Bulletin, 1894, 72. Rivea kituiensis, 

 Hallier f. Engl. Jahrb. xviii. 156 (excluding plant from Usambara, 

 Hoist, 415) ; hammer in Engl. Pfl. Ost-Afr. C. 334. 



Tffile land. British East Africa: Ukamba, Sildehrandt, 2759 ; Gregory! 

 Kibwezi, Kassner, 709 ! 



Mozamb. I>ist. German East Africa : Muansa, by Lake Victoria, Stuhl- 

 mann, 4559 ; Usambara ; Pangani, 2500 ft., Vollcens, 460 ! Ugogo-Usagara, 

 Trotlia, 207. British Central Africa : Nyasaland ; near Tambala, on the upper 

 Shire River, KirJc ! 



A specimen collected in Kavirondo, Uganda, by Mr. Scott-Elliot (6991) may re- 

 present a distinct species. The leaves are glabrescent, oblate, about 1^ in. long by 

 24 in. broad, the apex obscurely mucronulate, and the base subtruncate. The 

 peduncles are less rloriferous, with more congested flowers, and the sepals slightly 

 broader at the base (1| lin.). — See Rendle in Journ. Bot. 1901, 57. 



143. I. xiyikensis, Hallier f. in Engl. Jahrb. xxviii. 53. An erect 

 (?) shrub ; branches robust, terete, hollow, covered like the petioles 



