201. ASCLEPIADACEAE 453 



86. Corona-lobes with a narrow appendage on the inner face. Sepals lance- 



olate, with solitary glands. Corolla salver-shaped. Mericarps thick. 

 Twining shrubs. Flowers in dense umbels or racemes. — Species 3. 

 Tropical and South Africa. {Prageluria N. E. Brown, under Pergularia 



L.) Telosma Coville 



Corona-lobes without an appendage on the inner face, but sometimes 

 with a small, usually tubercle-like appendage at the base of the back. 87 



87. Corona-lobes united at the base, linear, erect. Sepals lanceolate, without 



glands. Corolla with linear segments recurved from the base. Stig- 

 matic head truncate. Mericarps slender. Erect herbs with a tuberous 

 rootstock. Leaves linear. Flowers in fascicles. — Species i. South- 

 east Africa to Rhodesia. The tubers are edible. Macropetalum Burch. 

 Corona-lobes free or nearly so. Twining plants, rarely erect shrubs or 

 herbs without a tuberous rootstock 88 



88. Corona-lobes spreading, linear. Sepals lanceolate, without glands. Corolla 



rotate. Stigmatic head flat or umbonate. Mericarps thick, villous. 

 Twining, tomentose shrubs. Leaves elliptical. Flowers in cymes. — 



Species i. Madagascar Pervillaea Decne. 



Corona-lobes spreading and tubercle-shaped, or erect, or converging. . 89 



89. Pollen-masses very small, disc-shaped. Corona-lobes short, usually 



tubercle-like. Sepals pointed, with solitary glands. Corolla rotate. 

 Stigmatic head more or less flattened and usually provided with a 

 central boss at the top. Mericarps slender. — Species 25. Tropical 

 and South Africa. Some are used medicinally. Tylophora R. Br. 

 Pollen-masses large or rather large, usually pear-shaped. Mericarps 

 usually thick 90 



90. Filaments united at the base, free above. Stigmatic head produced into 



a long beak. Ovary glabrous. Sepals oblong or ovate, with solitary 

 glands. Corolla campanulate. Twining shrubs or undershrubs. Leaves 

 leathery. Flowers in racemes or panicles. — Species 3. West Africa. 

 (Under Secamone R. Br. or Toxocarpus Wight et Arn.) 



Rhynchostigma Benth. 

 Filaments united up to the anthers 91 



91. Anther-appendages cohering into a long tube. Stigmatic head beaked. 



Ovary hairy. Sepals elliptical, with solitary glands. Corolla cam- 

 panulate, with linear segments. Twining shrubs. Leaves elliptical, 

 herbaceous. Flowers in panicles. — Species i. East Africa. (Under 



Marsdenia R. Br.) Traunia K. Schum. 



Anther-appendages not cohering into a tube 92 



92. Sepals large, without glands. Corolla funnel- or salver-shaped ; tube 



widened below. Stigmatic head conical. Twining shrubs. Leaves 

 leathery. Flowers large, in umbels. — Species 5. Madagascar. They 

 are used as ornamental plants, and the hairs of the seeds as vegetable 

 silk Stephanotis Thouars 



