REVISION OF KXTKA-TROPIOAL SOUTH AFRICAN ASCLEPIADACEiE. 



311 



EEVISION OF EXTRA-TEOPICAL SOUTH AFEICAN 

 ASCLEPIADACE.E. 



By Rudolph Schlechter. 



In this following paper I have endeavoured to comply with the 

 wish of many of my South African correspondents by making an 

 enumeration of the Asclepiadacece hitherto described from extra- 

 tropical South Africa. I have not attempted to draw a natural 

 boundary between the extra-tropical species and the tropical ones, 

 since anyone who has seen a little of the South African flora will 

 be convmced that it would have been a vain attempt ; in the east 

 as well as in the north no natural boundary exists. In Harvey & 

 Sonder's Flora Capensis the limits of the north are very uncertain, 

 as in those days very little was known about the interior districts. 

 Judging from the knowledge which we have nowadays of these 

 countries, I consider it advisable that in the volumes of the Flora 

 Capensis which are now in course of preparation only the species 

 south of the Tropic of Capricorn should be enumerated, while the 



