448 20I. ASCLEPIADACEAE 



Leaves broad-cordate. Flowers in many-flowered panicles. — Species 



5. Used as medicinal and fibre-plants. {Pergularia L.) Daemia R. Br. 



Outer corona nearly entire. Leaves linear, oblong, or ovate. Flowers 



in few-flowered umbels or fascicles 50 



50. Sepals lanceolate, without glands. Stigmatic head with a boss at the top 



and surrounded by a short 5-lobed cup. Erect shrubs. Leaves linear. — 



Species i. East Africa Diplostigma K. Schum. 



Sepals elliptical, with minute glands at the base. Stigmatic head without a 

 distinct boss. Twining herbs or undershrubs. — Species 4. Tropics. 

 Used medicinally Pentatropis Wight & Arn. 



51. (44.) Corona much lower than the stamens $2 



Corona equalling or exceeding the stamens 54 



52. Corona fleshy, crenate. Stigmatic head capitate, papillose. Mericarps 



linear. Erect herbs with a tuberous root-stock. Flowers in terminal 



panicles. — Species i. West Africa (Congo). . . Nanostelma Baill. 



Corona membranous, lobed. Stigmatic head with a boss or beak. Twining 



or procumbent undershrubs or shrubs 53 



53. Corolla campanulate. Corona-lobes alternating with the anthers. Stig- 



matic head with a long, 2-lobed beak. Twining undershrubs. Leaves 

 small. Flowers axillary, solitary or in few-flowered cymes. — Species i. 



Madagascar Pleurostelma Baill. 



Corolla rotate. Stigmatic head with a boss or a short beak. Twining or 

 procumbent shrubs. Leaves none. Flowers in umbels. (See 48.) 



Sarcostemma R. Br. 



54. Corona very large, campanulate, corolla-like. Stigmatic head conical. 



Corolla campanulate ; lobes rolled back at the edge. Twining shrubs. 

 Flowers in axillary umbels. — Species 3. Central Africa. (Under 



Cynanchum L.) Perianthostelma Baill. 



Corona not corolla-like 55 



55. Corona with concave or laterally compressed lobes. Herbs or under- 



shrubs 56 



Corona with flat, but sometimes appendaged lobes, or entire. ... 58 



56. Corona-lobes obviously united below, concave, 10. Stigmatic head 



pyramidal. Sepals blunt, without glands. Flowers solitary or in pairs. 

 Leaves hnear. — Species i. South Africa. (Under Cynanchum L.) 



Flanagania Schlecht. 



Corona-lobes nearly free. Stigmatic head rounded or produced into a 



boss at the top. Sepals pointed, with small glands at the base. Flowers 



in umbels or racemes. Stem twining 57 



57. Corolla with broad divisions. Corona-lobes with an inflexed apical ap- 



pendage. Leaves broad. Flowers in racemes or panicles. — Species 5. 



South and Central Africa. Some have edible fruits. Pentarrhinum E. Mey. 



Corolla with narrow divisions. Corona-lobes laterally compressed. Flowers 



in few-flowered umbels. (See 50.) . . Pentatropis Wight & Am. 



