201. ASCLEPIADACEAE 455' 



loi. Third (outermost) corona corolla-like, arising from the base of the corolla- 

 tube. Corolla campanulate, hairy. — Species i. South Africa (Cape 



Colony) Diplocyathus N. E. Brown 



Third (outermost) corona not corolla-like, arising from the throat of the 

 corolla, or wanting 102 



102. Second (intermediate) corona disc-shaped, entire ; third (outermost) ring- 



shaped. Corolla rotate. — Species 20, South Africa to Lake Ngami. 



Some are used as ornamental plants Duvalia Haw. 



Second (intermediate or outer) corona ring- or cup-shaped and more or 

 less deeply divided . . 103 



103. Corolla with accessory teeth between the lobes, campanulate, more or 



less distinctly lobed or cleft. — Species 30. South and Central Africa. 



Some are used as ornamental plants. {Huernia R. Br.) Heurnia R. Br. 



Corolla without accessory teeth between the lobes 104 



104. Corolla campanulate with broad lobes or rotate ; in the latter case (as 



usually) outer corona divided to the base. Stem with soft spines or 

 teeth, or without any. Flowers usually large, solitary or in pairs, more 

 rarely in clusters. — Species 100. South and Central Africa. Some are 

 used as ornamental or medicinal plants. (Including Podanthes Decne.) 



Stapelia L. 



Corolla campanulate with narrow lobes or rotate ; in the latter case outer 



corona nearly entire or more or less deeply divided, but not to the 



base 105 



105. Inner corona-lobes bent inwards and broadened at the tip, beset with 



short spines on the back ; outer short, united at the base. Corolla 

 purple-brown, rotate, cleft half-way down, bearing club-shaped hairs. 

 Flowers very large, solitary or in pairs. Stem with hard, usually brown 

 spines. — Species 2. Northern East Africa. Edithcolea N. E. Brown 

 Inner corona-lobes not broadened at the tip. Flowers of moderate size. 

 Stem with soft, green spines or teeth. — Species 30. Some of them 

 are used as ornamental plants, or as vegetables, others are poisonous. 

 (Including Apteranthes Mik. and Boucerosia Wight et Am.) 



Caralluma R. Br. 



106. (93.) Corolla tubular, rarely funnel- or salver-shaped ; tube long and 



narrow, usually widened at the base ; lobes usually cohering at the tip, 

 at least when young. Flowers large or of moderate size, very rarely 



small. Herbs or undershrubs. 107 



Corolla rotate or campanulate ; tube short or rather long but wide ; 

 lobes rarely cohering at the tip 109 



107. Calyx without glands at the base. Corona of 5 lobes. Anthers with a 



small appendage at the apex. Flowers in few-flowered umbel-like cymes. 

 Species 3. South Africa and southern Central Africa. {Barrowia 



Decne.) Orthanthera Wight 



Calyx with glands at the base. Corolla more or less tubular ; lobes 

 cohering at the tip, at least in bud. Corona double, rarely simple, 

 but then anthers without an apical appendage 108 



