174 xc. convolvulace.e (baker and rendle). [Ipomcea. 



90. I. arenicola, Rendle <£• Britten in Journ. Bot. 1894, 176. A 

 glabrous perennial herb with a tuberous root. Stems decumbent, fleshy, 

 purple, 4-10 in. long, Leaves deep green, l^-3i in. long ; lower lanceo- 

 late or elliptic, usually acute ; upper larger, elliptic, subacute to acute ; 

 petiole about the length of the blade. Flowers on a many (-10) flowered 

 spreading cyme springing from the base of the shoot, sometimes solitary 

 or few together in axillary cymes ; peduncles shorter than the leaves, 1|- 

 in. long or less; pedicels short; bracts small, triangular-subulate. 

 Sepals narrowly ovate, acuminate, tip more or less convolute, 6 lin. 

 long, the two outer smaller and shorter. Corolla apparently cainpanu- 

 late-funnel-shaped about 2 in. long, ''whitish-violet, purple inside" 

 (Welvntsch). Capsule globose, glabrous, 1 lin. in diam. Seeds shortly 

 tomentose. — Hiern in Cat. PI. Welw. i. 740. 



lower Guinea. Angola: Pungo Andongo ; sandy woods near Cazelln, Wel- 

 witsch, 6180 ! 



91. I. simplex, var. obtusisepala, Rendle. Stem woody, appar- 

 ently trailing, G in. long, reaching nearly 1 lin. in diam. at the base, 

 glabrous. Leaves sessile, linear, narrowing towards the base, reaching 

 2\ in. long and lh lin. broad, glabrous, apex weakly cuspidate. Flowers 

 solitary, axillary on very short peduncles. Sepals glabrous, ovate, sub- 

 obtuse to shortly acute, 4 lin. long. Corolla rose-purple ?, funnel- 

 shaped, li in. long. 



Mozamb. Dist. Rhodesia : Salisbury, Rand, 272. 



Described from a single shoot which I had formerly {Journ. Bot. 1901, 56) 

 referred to tbe species, from which it differs in the sliorter and almost obtuse 

 sepals. 



The species is widely distributed in South Africa. 



92. I. "Welwitschii, Vatke ex Hcdlier f. in Engl. Jalirb. xviii. 146. 

 Near /. simplex, but much taller. Stems stiff, straight, woody, 9 in- 

 14- ft. long, simple or shortly branched, terete, glabrous or minutely 

 hirsute. Leaves linear to linear-lanceolate, shortly acute, tapering to a 

 very short petiole, rigid, glabrous, If- 5 in. long, 1^ to barely 3 lin. broad. 

 Peduncles many, axillary, usually short, 1-3-flowered ; bracts small, 

 lanceolate. Sepals lanceolate, acuminate, glabrous, 5-7 lin. long. 

 Corolla funnel-shaped, glabrous, white-rosy (Welwitsch), 2-24; in. long, 

 1§ in. broad. — Britten in Journ. Bot. 1894, 85 ; Rendle in Journ. Bot. 

 1901, 57 ; Hiern in Cat. Afr. PL Welw. i. 739. /. Hystrix, Hallier f. 

 in Engl. Jahrb. xviii. 146, and in Bull. Herb. Boiss. vii. 53. 



Lower Guinea. Angola : Malange, Mechow, 224 ; Huilla ; busby pastures 

 between Kene and ATumpata and near Lopollo, Welwitsch, 6120 ! German South- 

 west Africa : Damaraland, Hopfner, 39. 



IVXozamb. Dist. Lake Tanganyika. Cameron ! German East Africa : Gonda 

 (Igonda), B oehm, 56. British Central Africa: Nyasaland; Xamitawa Mountain, 

 McClounie, 85! Mlanji, Scott-Elliot, S639 ! Shire Highlands, Buchanan, 134 ! 

 North Nyasa, Whyte ! 



Var. latifolia, Britten in Journ. Bot. 1894, 85 ; Hiern in Cat. Afr. PI. Welw. i. 

 739. Leaves linear-oblong to lanceolate or oblanceolate, cuspidate or shortly 



