ON THE ASCLEPIADEjE. 217 



Habitus. Frutices v. suffmtices erecti. Folia oppo- [ss 

 sita, margine ssepe revolutse. Umhellm interpetiolares. 

 Patria. Africa Australis. 



Obs. Asclepia?, arbor.escens, fruticosa and setosa, are the 

 three certain species of this genus ; but ^. crispa lias pro- 

 bably the same structure. The flowers I have examined, 

 but have not seen the fruit. A. pubescens ought probably 

 to be altogether oiuitted ; for, according to the description 

 and specimen in Linnseus's Herbarium, it is A. arborescens, 

 while according to the reference to Plukenet, it is A. crispa. 

 This observation I have copied from Mr. Dryander's notes. 



XYSMALOBIUM. [Aselepiadis sp. Linn. 



Char. Corolla 5fida, patens. 



Corona staminea summo tubo filamentorum imposita, 

 simplici serie decempartita, laciniis 6 antheris oppositis 

 carnosis, subrotundis, intus simplicibus ; 5 reliquis nanis. 



Antherce membrana terminatse. 



MasscB poUinis compressse, apice affixse, pen dulse, pro- 

 cessubus connectentibus latiusculis. 



Stigma muticum. 



FoUiculi ventricosi, ramentacei. Semina comosa. 



Habitus. Frutices erecti. Folia opposita. Um- pa 

 bellce interpetiolares. Flores majusculi, limbo nunc bar- 

 bate. 



Patria. Africa AustraUs. 



Obs. This genus at present consists of only two species, 

 Asclepias undidata and grandijlora. 



CALOTROPIS. [Aselepiadis sp. Limi. 



Char. Corolla sub-campanulata, tubo angulato, angulis 

 intus saccatis, limbo 5partito. 



Corona staminea 5phylla, foliolis cariiiasformibus, tubo 

 filamentorum longitudinaliter adnatis, basi recurva. 



