201. ASCLEPIADACEAE 449 



58. Staminal column long. Corona-lobes lo — 15. Sepals lanceolate-oblong, 



with basal glands. Corolla rotate. Erect shrubs. Leaves cordate- 

 ovate. Flowers in racemes, — Species 2. East Africa. (Under 

 Cynanchum L. or Vincetoxicum Moench). Schizostephanus Höchst. 

 Staminal column short or wanting 59 



59. Sepals subulate, with solitary glands at the base. Corolla campanulate or 



urceolate ; lobes pointed, fleshy at the sinuses. Corona entire or 5- 

 lobed. Stigmatic head lengthened, mushroom-shaped. Erect herbs. 

 Leaves linear. Flowers small, in umbel-like inflorescences. — Species 2. 



Madagascar Pycnoneurum Decne. 



Sepals lanceolate or ovate. Flowers in umbel- or raceme- like inflorescences. 

 — Species 40. Some of them yield fibre, poison, or medicaments. 

 (Including Cynoctonum E. Mey., Endotropis Endl., and Vincetoxicum 

 Moench) Cynanchum L. 



60. (43.) Corona-lobes distinctly concave, more or less hood-shaped. Erect 



plants 61 



Corona-lobes flat or rather flat, sometimes keeled 66 



61. Pollen-carriers with very large, broad and concave arms. Stigmatic 



head more or less ruminate. Sepals pointed, with numerous basal 

 glands. Corolla rotate. Corona-lobes not spurred. Herbs. Leaves 

 narrow. Inflorescences umbel-like. — Species 10. Central and South 

 Africa. {\Jndev Asclepias'L.) .... Stathmostelma K. Schum. 

 Pollen-carriers with narrow and flat arms. Stigmatic head not ruminate. 62 



62. Corona-lobes with a recurved spur at the base and two teeth at the apex. 



Anthers stalked. Stigmatic head depressed. Sepals pointed, with 

 many glands at the base. Corolla green outside, red within. Mericarps 

 inflated. Leaves broad. Flowers large, in panicles. — Species 2. 

 Central and North Africa. They yield a kind of rubber, bast-fibre, 

 vegetable silk, poison, and medicaments, and serve as ornamental plants. 



Calotropis R. Br. 

 Corona-lobes not spurred 63 



63. Corona lobes with a more or less horn-Hke appendage arising from the 



cavity. Sepals pointed, with solitary or paired glands at the base. 

 Corolla rotate. Mericarps thick. Herbs or undershrubs. Inflorescences 

 umbel-Hke. — Species 40. Central and South Africa ; besides one species 

 naturalized in the tropics. Some species yield rubber, fibre from the 

 bark, vegetable silk from the hairy seeds, or medicaments ; several 



serve as ornamental plants Asclepias L. 



Corona-lobes without an appendage in the cavity, but sometimes with 

 scale- or tooth-hke appendages at the base 64 



64. Corona-lobes without appendages or alternating with small teeth. Sepals 



pointed, with basal glands. Stigmatic head usually flat. — Species no. 

 Some of them yield vegetable silk or medicaments, or serve as ornamental 

 plants. (Including Krehsia Harv. and Pachy carpus E. Mey., under 

 Asclepias L.) Gomphocarpus L. 



2F 



