182 xc. convolvulacEjE (baker and rendle). [Ipomcea. 



Nile Iiand. Niamniam : Guinba, Scluveinfurtli, 3994. 



107. I. macrocalyx, Hallier f. in. Engl. Jahrb. xxviii. 51, not of 

 Choisy. Stern densely clothed with short fine white pubescence. Leaf 

 cordate-ovate, entire, apiculate, 7-8 in. long, 4| in. broad, densely 

 clothed with short whitish soft pubescence. Flowers solitary ; peduncle 

 strong, 9 lin. long. Calyx globose, 1^ in. long, densely clothed with 

 short soft whitish pubescence ; two outer sepals orbicular, quite hiding 

 the others. Corolla 4^ in. long ; tube silky ; limb with 5 silky ribs 

 outside. Stamens and style half as long as the corolla. Fruit and seeds 

 unknown. — Argyreia ? macrocalyx, Baker in Kew Bulletin, 1894, 67. 



Mozamb, Dist. German East Africa : Unyamwezi, Msalala, Hannington ! 



108. I. Hanningtoni, Rendle. Leaves elliptic with retuse base, 

 apiculate, 2f in. long by 2\ in. broad, densely clothed with soft whitish 

 pubescence as in /. macrocalyic. Calyx glabrous, barely 1 in. long ; 

 two outer sepals ovate, blunt, hiding the three inner. Corolla 4^ in. 

 long ; tube and miclpetaline areas on limb silky. Stamens and style 

 half as long as the corolla. Fruit and seeds unknown. — I. macrocalyx, 

 var. decalvata, Hallier f. in Engl. Jahrb. xxviii. 51. Argyreia 

 Hanningtoni, Baker in Kew Bulletin, 1894, 07. 



Mozamb, Dist. German East Africa ; Usambara ; Kisokwe, Hannington ! 

 Near I. macrocalyx, but distinguished by the shape of the leaf, and the shorter 

 and glabrous calyx. 



109. I. dammeriana, Be Wild. Etudes, Fl. Katanga, 115. Erect; 

 stems rigid, rather thick, glabrous. Leaves lanceolate, 3i to 4J in. 

 long, 1-lj in. broad, strongly cuneiform at the base, rather sharply 

 apiculate at the apex, margin entire or undulate, glabrous on both sur- 

 faces, -sometimes sparsely hairy on the nerves ; petiole i in. long. 

 Flowers solitary on stalks less than ^ in. long, bearing towards the 

 middle a pair of large glabrous elliptic caducous bracts, nearly 1 in. 

 long by half as broad, enveloping the young bud. Sepals about 1 in. 

 long, coriaceous, elliptic, glabrous, apex obtuse or apiculate. Corolla 

 tubular-campanulate, 4 in. long ; tube § in. in diam. Ovary glabrous. 



South Central. Congo Free State : Katanga; Lnkafu, Verdick, 252. 



Recalls I. prismatosyphon, var. Huchneri, but differs in its narrower leaves with 

 cuneiform base, and smaller flowers and bracts. 



110. I. macrosiphon, Hallier f. in Engl. Jahrb. xxx. 387. A 

 large subscandent shrub ; stems woody, terete, glabrous, the leaves and 

 flowers borne on short slender erect shoots springing from stouter 

 elongated stems from which the leaves have fallen. Leaves broadly 

 ovate, up to 4-i in. long by 3^ in. broad, cuspidate, subtruncate or 

 slightly cordate at the base, margin slightly repand, dentate, glabrous 

 when mature, covered with white wool on the veins beneath when 

 young ; petiole as long as the blade. Peduncles up to 1 in. long, 

 l-flowered ; bracts opposite, large, membranous, cymbiform, enclosing 



, 



