201. ASCLEPIADACEAE 447 



40. Calyx without glands inside. Corona-lobes petal-like. Twining under- 



shrubs. — Species 2. West Africa. . . . Prosopostelma Baill. 



Calyx with 5 glands inside. Corona-lobes not petal-like. Mericarps 



thick, prickly. Erect or procumbent, downy or cottony plants. — 



Species 7. Central Africa, Sahara, and Egypt. Glossonema Decne. 



41. Corona-lobes bristle-Hke, curved. Corolla with Hnear divisions. Stigmatic 



head elongate-conical. Leaves linear. Flowers sohtary. — - Species i. 



Northern East Africa. (Under Glossonema Decne.) Conomitra Fenzl 



Corona-lobes broad. Corolla with lanceolate or ovate divisions. Leaves 



lanceolate or oblong 42 



42. Stigmatic head elongate-conical, 2-cleft, projecting beyond the anther- 



appendages. — Species I. South Africa. {Under Parapodium E. Mey.) 



Rhomboneraa Schlecht. 

 Stigmatic head obtusc-subconical, not projecting beyond the anther- 

 appendages. — Species 2. South Africa. . . . Parapodium E. Mey. 



43. (34.) Corona-lobes united more or less, usually high up. Corolla with 



contorted, rarely withvalvate aestivation. [Subtribe cykanchinae.] 44 



Corona-lobes free or nearly so. Corolla with valvate or almost valvate 



aestivation. Erect or procumbent herbs or undershrubs, rarely twining 



or shrubby. [Subtribe asclepiadinae] 60 



44. Corona double 45 



. Corona simple, but sometimes with small accessory teeth between or 



within the lobes 51 



45. Leaves reduced to scales or absent. Flowers in umbels or fascicles. Twining 



or procumbent shrubs 46 



Leaves well developed 49 



46. Corolla shortly lobed or cleft to the middle, with valvate aestivation. Outer 



corona cupular, entire or lobed 47 



Corolla divided beyond the middle, with contorted aestivation, small, 

 white or yellow 48 



47. Corolla shortly lobed, large, red. Outer corona entire or obscurely lobed. 



Stigmatic head 2-lobed. — Species i. Madagascar. 



Platykeleba N. E. Brown 



Corolla cleft to the middle. Outer corona distinctly lobed. Stigmatic 



head entire. — Species i. Madagascar. Decanemopsis Cost. & Gall. 



48. Outer corona of 5 long lobes united below, awl-shaped above. Corolla 



yellow. Mericarps very long. — Species 2. Madagascar and Mauritius. 



Used medicinallv Decanema Decne. 



Outer corona short, ring- or cup-shaped, entire or shortly lobed. — Species 

 8. Tropical and South Africa. The stem and the milky juice of some 

 species are edible or used medicinally ; they also yield resin. (Including 

 Sarcocyphula Harv.) Sarcostemma R. Br. 



49. Outer corona lobed ; lobes of the inner spurred. Sepals lanceolate, with 



glands at the base. Corolla white or greenish, woolly. Twining shrubs. 



