ON THE ASCLEPIADEiE. 217 



Habitus. Frutices v. suffrutices erecti. Folia oppo- tss 

 sita, margin© ssepe revolutse. Umbellce interpetiolares. 

 Patria. Africa Australis. 



Obs. Asclepias arborescens, fruticosa and setosa, are the 

 three certain species of this genus ; but A. crispa has pro- 

 bably the same structure. The flowers I have examined, 

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

 to be altogether omitted ; for, according to the description 

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

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

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



XYSMALOBIUM. [Asclepiadis sp. Linn. 



Char. Corolla 5fida, patens. 



Corona staminea summo tubo filamentorum imposita, 

 simplici serie decempartita, laciuiis 5 antheris oppositis 

 carnosis, subrotunclis, intus simplicibus ; 5 reliquis nanis. 



Anther (B membrana terminate. 



Massce pollinis compressor, apice affixae, pendulae, pro- 

 cessubus connectentibus latiusculis. 



Stigma muticum. 



Follicidi ventricosi, ramentacei. Semina comosa. 



Habitus. Frutices erecti. Folia opposita. Urn- cso 

 bellce interpetiolares. Flores majusculi, limbo nunc bar- 

 bat o. 



Patria. Africa Australis. 



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

 Asclepias undidata and graiidiflora. 



CALOTROPTS. [Asclepiadis sp. Linn. 



Char. Corolla sub-campanulata, tubo angulato, angulis 

 intus saccatis, limbo 5partito. 



Corona staminea 5phylla, foliolis carinaeformibus, tubo 

 filamentorum longitudinaliter adnatis, basi recurva. 



