Merremza.] xc. convolvulace^e (baker and rendle). Ill 



iVXozamb. Dist. British Central Africa : Ngamiland; Kwebe Hills, 3400 ft., 



3Irs. Lugard, 134 ! Northern Kalahari Desert, TKlakane Pits, Lugard, 227 ! 

 Also in the Kalahari region of South Africa. 



20. M. xanthophylla, H oilier f. in Engl. Jahrb. xviii. 113. 

 Stems prostrate or climbing, herbaceous, subcompressed and angular, 

 clothed, as is the whole plant, with short yellow-brown hairs. Leaves 

 with shallowly cordate base, reaching about 2^ in. long by 2 in. broad in 

 the lower part, pinnately 5-9-lobed ; lobes acute or obtuse, the terminal 

 above 1 in. long, the basal much the smallest, minutely hirsute on both 

 faces ; nerves light-coloured and prominent beneath ; petiole (5-9 lin. 

 long. Peduncle 1-^—2 in. long ; cymes few-flowered, dense ; bracts 

 ovate-lanceolate to lanceolate, acute, 6 lin. long or less, subfoliaceous, 

 hiding the base of the sepals. Pedicels 1|— 3 lin. long. Buds ovoid. 

 Sepals coriaceous, elliptic, obtuse, glabrous, 4 lin. long. Corolla 

 funnel-shaped, whitish, 8 lin. long, densely covered with yellow- 

 brown hairs in bud. — Ipomoea xanthophylla, Hochst. in Schimp. PI, 

 Abyss. No. 432. 



Mile Land. Abyssinia: Uschan, 5000-6000 ft., Schimper, 2099 ; and without 

 precise locality, Schimper, 432 ! 



21. M, tridentata, E oilier f. in Engl. Jahrb. xviii. 116. Glab- 

 rous ; stems slender, prostrate, Leaves numerous, small, very shortly 

 stalked, hastate-oblong to subquadrate, 9 lin. or less in length, apex 

 obtuse, emarginate and mucronulate to triclentate. Peduncles 1-fiowered 

 in African specimens, a little longer than the leaf, forming a slightly 

 thickened pedicel above the minute ovate bracts. Sepals oblong, apex 

 rounded, shortly cuspidate, 2-2| lin. long, the outer slightly the shorter. 

 Corolla yellow, about 6 lin. long. Capsule not seen in African speci- 

 mens, globose, glabrous, about 3 lin. in diam. Seeds dark, glabrous. — 

 Hiern in Cat. Afr. PI. Welw. i. 729. Ipomcea tridentata, Both in Romer, 

 Archiv. Botan. i. iii. 38 ; Choisy in DC. Prodr. ix. 353 ; C. B. Clarke 

 in Hook. f. El. Brit. Ind. iv. 205. 



lower Guinea. Angola : Pungo Andongo ; sandy hanks of the River 

 Cuanza, near Condo, Welwitsch, 6190 ! 

 Also in India. 



22. M. angustifolia, Hallier f. in Engl. Jahrb. xviii. 117 (incl. 

 var. ambigua). Annual, glabrous. Stems prostrate, then twining, very 

 slender. Leaves linear, obtuse, mucronate, 1-3 in. long, varying very much 

 in breadth, generally from 1-2 lin., rarely broader, with small toothed 

 hastate basal auricles. Peduncle very slender, 1-1|- in. long., 1-3- 

 flowered ; pedicels thickened, subclavate, shorter than the peduncle ; 

 bracts minute, lanceolate, acute or cuspidate, persistent. Flower-buds 

 elliptic-ovoid. Sepals oblong to ovate-oblong, obtuse rarely subacute, 

 cuspidate, glabrous, 2—21 ii n# long, the two outer slightly shorter than 

 the inner. Corolla pale yellow, funnel-shaped, 6-8 lin. long and broad. 

 Capsule globose, glabrous, 3 lin. in diam. Seeds glabrous. — Wildem. & 

 Durand in Bull. Herb. Boiss. 2 ser. i. 37 ; Hiern in Cat. Afr. PI. 



