Hewittia. | XC. CONVOLVULACEE (BAKER AND RENDLE). 101 
486 ; Hiern in Cat. Afr. Pl. Welw. i. 727. Aniseta A fzelit, G. Don, Gen. 
Syst. iv. 295. Ipomea <Afzelii, Choisy in DC. Prodr. ix. 3732 J. 
benguelensis, Baker in Kew Bulletin, 1894, 69. J. phyllosepala, Baker 
le. J. ? teretistigma, Choisy in DO. Prodr. ix. 373. Bonamia Volkensii, 
Dammer in Engl. Pfl. Ost-Afr. C. 329. 
Upper Guinea. Gambia, Brown-Lester, 26! Sierra Leone, Afzelius! Don! 
Scott-Elliot, 4111! Liberia: Cape Palmas, Vogel, 14! 59! Ashanti, Cummins, 
40! Togo, Kling, 37. Lagos, Millen, 76! Barter, 20160! Abeokuta, Irving, 
120! Barter, 3351! Cameroons, Johnston! Zenker and Staudé, 631 ! 
Nile Land. Somaliland: Ganane River, Riva, 378; Web River, near 
Karanle, Riva, 990. Banks of Upper Nile, Speke & Grant. Niamniam, 
Schweinfurth; 2953! Uganda, Whyte! Scott-Elliot, 7313! Ruwenzori, Scott- 
Elliot, 7537! British East Africa : Kavirondo, Whyte ! Kiroruma River, Gregory ! 
River Vena, Kassner, 111! 127! Schimba Mountains, Kdssner, 219! Ribe, 
Wakefield! Mombasa, Riva, 1748. 
Lower Guinea. (iaboon, Soyaua, 436! Biittner, 381. Lower Congo: 
Kisantu, Gillet, 262; and without precise locality, Smith! Burton! French 
Congo: Bata, Dinklage, 1189. Angola: Golungo Alto, Welwitsch, 6221! 6225! 
Ambaca, Welwitsch, 6224! Bumbo, Welwitsch, 6127? Loanda, Gossweiler ! 
South Central. Congo Free State: between the Rivers Lubilasch and 
Lomami, Pogge, 1026 ; Nyangwe, Pogge, 1150. 
Mozomb. Dist. Zanzibar, Bojer. German East Africa: Karagwe ; Kagera 
Kiver, Bagshawe, 31! Dar es Salem, Kirk ! Usambara, Holst,490, 527a, 2049 ! 
Kassner, 14! Kilimanjaro ; Marangu, Volkens, 1389. Portuguese East Africa : 
Lupata and Shupanga, Kirk! Morambala, Airk! Caboceira and Rio de Sena, 
Peters. British Central Africa: Nyasaland, Buchanan, 487! Whyte! Meller! 
Also Natal and Tropical Asia. 
1). MERREMIA, Dennst.; Hallier f. in Engl. Jahrb. xvi. 581 (incl. 
Operculina). 
Sepals 5, generally subequal, and more or less coriaceous, elliptic 
or lanceolate, more rarely orbicular, accrescent in the larger species. 
Corolla campanulate to broadly infundibuliform, often white, some- 
‘times yellowish; midpetaline areas generally not well defined. Anthers 
‘usually twisted above. Pollen not spiny. Ovary 2-4-celled, 4-ovuled ; 
style and stigma of Jpomea. Capsule with generally valvular, rarely 
transverse dehiscence. Seeds generally 4, glabrous.—Annual or perennial 
plants, with generally herbaceous climbing, more rarely prostrate or 
trailing stems and axillary flowers, solitary or in few- to many-flowered 
dichasial cymes. 
Species akout 60, widely spread in the tropics. 
I cannot distinguish generically the larger-flowered and fruited species which 
have been regarded as forming a distinct genus Operculina. The transverse dehis- 
hiscence of the fruit is not general in this small group; in one of its most typical 
members, 7. kentrocaulos, the large capsule splits longitudinally, the valves separating 
from the central septum, which bears the remains of the style. 
Corolla 14~23 in. long. 
Sepals 3-1 in. long. 
Leaves cordate-ovate, entire 
Leaves palmately cut. 
1. UM. Turpethum. 
