201. ASCLEPIADACEAE 445 



Corolla funnel-shaped. Anthers with a long ciliate process. Twining 

 shrubs. — Species lo. Madagascar. Used medicinally ; one species 

 yields rubber. (Under Tacazzea Decne.) . . . Pentopetia Decne. 



26. Corona-lobes arising from the sinuses between the corolla-segments. 



Corolla bell-shaped, with oblong segments. Leaves opposite. Flowers 



in terminal and axillary cymes. — Species i. South-east Africa to Lake 



Ngami. (Under Cryptolepis R. Br.) . Stomatostemma N. E. Brown 



Corona-lobes arising from the corolla-tube below the sinuses. ... 27 



27. Sepals pointed, lanceolate. Corolla bell-shaped with long and narrow seg- 



ments. Filaments united at the base. Pollen-carriers with an orbicular 

 blade. Erect shrubs. Leaves in clusters. Flowers soHtary or in pairs. 

 — Species i. South-west Africa to Angola. (Under Cryptolepis R. Br.) 



Curroria Planch. 



Sepals blunt. Corolla wheel-shaped. Pollen-carriers with a hnear or 



oblong blade. Leaves scattered. Flowers in sometimes few-flowered 



cymes or panicles 28 



28. Corolla with long and narrow segments, beaked in bud. Filaments united 



at the base. Anthers almost erect. Pollen-carriers linear. Stem 

 twining. Inflorescences lax. — Species 15. Tropical and South Africa. 

 One species yields a dye. (Including Acustelma Baill.). 



Cryptolepis R. Br. 



Corolla with oblong, rather short segments, hence not beaked in bud. 



Filaments free. Anthers inflexed. Pollen-carriers with an oblong blade. 



Stem usually erect. Inflorescences dense. — Species 10. Central and 



South Africa. (Under Cryptolepis R. Br.) . . . Ectadiopsis Benth. 



29. (i.) Pollen-masses contained in the lower part of the anthers, pendulous 



from the arms of the pollen-carriers. [Tribe ASCLEPIADEAE.] . 30 



Pollen-masses contained in the upper part of the anthers and attached to 



the pollen-carriers in an erect, ascending, or horizontal, rarely [Tylophora] 



an almost pendulous position 75 



30. Corona obscure or wanting. [Subtribe astephaninae.] .... 31 

 Corona distinctly developed 34 



31. Corolla shortly lobed, urceolate, hairy within. Calyx without glands. 



Corona arising from the corolla-tube or wanting. Filaments short. 

 Stigmatic head conical, notched. Mericarps thin or rather thin. Twin- 

 ing shrubs. Leaves narrow. Flowers of medium size, in usually 

 many-flowered cymes or umbels. — Species 10. South Africa. 



Microloma R. Br. 



Corolla deeply divided. Corona arising from the staminal tube or wanting ; 



in the latter case filaments none and flowers small 32 



32. Anthers sessile or nearly so. Corona-lobes alternating with the anthers or 



wanting. Corolla campanulate or urceolate, glabrous or tubercled 

 within. Stigmatic head more or less conical. Mericarps thick or rather 

 thick. Shrubs or undershrubs. Flowers small, in usually few-flowered 



