446 2(»I. ASCLEPIADACEAE 



cymes. — Species lo. Soutliern and tropical Africa. (Including Haentax 



E. Mey. and Microstephanus N. E. Brown) . . Astephanus R. Br. 



Anthers stalked. Corona-lobes opposite to the anthers. Leaves oval. 33 



33. Stigmatic head beaked. Calyx glandular. Corolla campanulate. Small 



shrubs. Flowers in few-flowered, sessile cymes or fascicles. — Species i. 



Northern East Africa Podostelma K. Schum. 



Stigmatic head truncate or slightly convex. Corolla campanulate or 

 rotate. Twining herbs or undershrubs. Flowers in racemosely arranged, 

 umbel-like cymes. — Species i. East Africa. (Under Tylophora R. Br.) 



Tylophoropsis N. E. Brown 



34. (30.) Corona inserted on the corolla, free (rom the staminal tube, but 



sometimes approximate to it. [Subtribe glossonematinae.] . . 35 

 Corona, at least the inner, inserted on the staminal tube 43 



35. Corona double, the outer ring-shaped, the inner of 5 lanceolate scales. 



Anthers sessile. Calyx glandular within. Corolla rotate or widely 

 campanulate, glabrous within, with valvate aestivation. Twining herbs or 

 undershrubs. Flowers conspicuous, in umbels or racemes. — Species 2. 

 Central Africa and Egypt. Used as vegetables, as ornamental plants, 



and in medicine. . Oxystelma R. Br. 



Corona simple. Corolla with contorted aestivation 36 



36. Corona-lobes united about to the middle 37 



Corona-lobes free or united at the base only. Staminal tube short or 



wanting 38 



37. Sepals blunt. Corolla rotate, yellowish ; segments velvety within, with 



distinctly contorted aestivation. Corona of 10 lobes, the alternating 

 2-cleft. Anthers without an apical appendage. Stigmatic head with 

 5 small points at the angles. Twining shrubs. Leaves wanting. 

 Flowers small, in few-flowered umbels. — Species 2. Madagascar. 



Vohemaria Buchen. 

 Sepals pointed, with numerous glands within. Corolla almost campan- 

 ulate ; segments glabrous within, with subvalvate aestivation. Corona 

 of 5 lobes. Staminal column long. Stigmatic head flat or slightly 

 concave, 5-lobed. Mericarps short and thick. Erect shrubs. Leaves 

 lanceolate. Flowers in many-flowered cymes. — Species i. Nile-lands 

 and Sahara. Used medicinally, (Under Cynanchum L.) 



Solenostemma Hayne 



38. Corona inserted at the base of the corolla. Flowers in few-flowered 



cymes 39 



Corona inserted below the sinuses of the corolla. Calyx with 5 glands 

 at the base. Flowers in umbel-like inflorescences. Erect herbs. . 41 



39. Corolla-tube longer than the segments. Calyx without glands inside. 



Corona-lobes strap-shaped, gibbous outside. Twining shrubs. — 



Species i. Naturalized in the island of Madeira. Araujia Brot. 



Corolla-tube shorter than the segments. Herbs or undershrubs. . . 40 



