106 XC. CONVOLVULACEE (BAKER AND RENDLE). — [JZerremia. 
Var. tomentosa, Hallier f. in Bull. Soc. Roy. Bot. Belg. xxxvii. 90. Petioles, the 
lower surface of the leaf-nerves, and peduncles clothed with greyish tomentum. 
South Central. Congo Free State : Mtowa, on Lake Tanganyika, Descamps. 
8. M. umbellata, Hallier f. in Engl. Jahrb. xviii. 114. Perennial. 
Stems slender, terete, twining, glabrous or slightly hairy. Leaves 
cordate-ovate, obtuse to acute, weakly mucronate, 3—6 in. long, 2-34 in. 
broad, puberulous when young, glabrous or pubescent on the slightly 
prominent nerves when mature ; petioles shorter than the leaf, 1—4 in. 
long. Peduncle 2-6 in. long; cymes umbellate, few- or many-flowered ; 
bracts triangular-subulate, minute, persistent; pedicels 6-9 lin. long, 
subclavate. Flower-buds ovoid, subacute. Sepals glabrous, 4-5 lin. 
long, elliptic to elliptic-ovate, obtuse or minutely mucronate. Corolla 
funnel-shaped, sulphur-yellow or white, glabrous outside, 1-14 in. long; 
midpetaline areas more deeply coloured but not sharply defined. 
Capsule small, subglobose, glabrous. Seeds velvety.—Dammer 1 
Engl. Pfl. Ost-Afr. C. 330; Hiern in Cat. Afr. Pl. Welw. i. 728. 
Ipomea wmbellata, G. Meyer, Prim. Fl. Esseq. 99 ; Choisy in DC. Prodr. 
ix. 877; Benth. in Hook. Niger Fl. 467. JZ. primuleflora, G. Don, 
Gen. Syst. iv. 270; Choisy, l.c. 390: 
Upper Guinea. Senegambia, Leprieur. Gambia, Skues! Sierra Leone: 
Don! Garrett, 27! Scott-Elliot, 4324! Cameroons, Bates, 194! Preuss, 562 
Akwa, Dinklage, 157. Great Batanga, Dinklage, 751. Fernando Po, Vogel, 54! 
Barter, 1838! Mann, 85! Prince’s Island, Welwitsch, 6210! 6211! Quintas. 
Mozamb. Dist. German East Africa: Masailand, Fischer, 299. 
Widely spread in Tropical America, and nearly allied to the Asiatic IZ. cymosa, 
which differs in the shape of the leaf and the larger flowers. 
Hallier in Bull. Herb. Boiss. y. 375 distinguishes the West African forms with 
yellow flowers as var. occidentalis from the East African (var. orientalis), in which 
the flowers are said to be white. 
9. M. spongiosa, Rendle in Journ. Bot. 1894, 179. Stems 
glabrous, prostrate, reaching more than 4 ft. in length in the specime? 
seen, narrowly winged, as are the petiole and peduncle. Leaves shortly 
petioled, lanceolate, acuminate, 3-34 in. long, about 6 lin. broad, light 
green, glabrous, spongy below; margin crisped ; petiole 3 lin. or less 12 
length. Peduncle shorter than the leaves, 1? in. long, bearing a pat 
of closely few- (to 5-) flowered monochasial cymes ; bracts membranous, 
subulate, 13-5 lin. long. Flower-buds ellipsoid to ovoid, obtuse. 
Sepals subequal, elliptic, glabrescent, coriaceous, with a thin, brittle 
border, 3 lin. long. Corolla not seen fully expanded, “ white with 
a rosy tinge, plumose, hirsute,” Welwitsch. Capsule thin-walled, 
brittle, about 4 lin. long. Seeds pubescent.—Hiern in Cat. Afr. Pl. 
Welw. i. 728. Ipomea uliginosa, Welw. ex Rendle in Journ. Bot. 1894; 
179. J. spongiosa, Rendle, 1.c. 
Lower Guinea. Angola: Pungo Andongo; swampy parts of Mutollo, Wel- 
witsch, 6169 ! 6169b (=6196b)! 
10. M. quercifolia, Hallier f. in Engl. Jahrb. xviii. 114- 
Perennial. Stems trailing or twining, minutely muricate as are the 
