ON THE ASCLEPIADEiE. 231 



CYNANCHUM. [Cynanchi sp. Linn. 



Char. Corolla subrotata, 5partita. 



Corona staminea monophylla, 5-201oba, dum 5fida lobis 

 antheris oppositis. 



Antherce membiana terminatse. 



Masses poUinis ventricosse. pendulee. 



Stigma apiculatura. 



Folliculi Iseves. Semina comosa. 



Habitus. Plant(S perennes, vel suffrutices, utpkiriiuum 

 volubiles. Folia opposita. TJmbellce interpetiolares. 



Patria varia, a gradu 59° lat. bor. ! usque ad 32° lat. 

 aust. 



Obs. Though I have here very much limited the Lin- 

 nean genus Cynanchum, yet it appears still to contain the 

 elements of several genera : I shall therefore add the cha- 

 racters of all the species I am acquainted with, divided 

 into sucb sections as will probably hereafter be considered 

 distinct genera. 



/. Corona staminea tubulosa, columnam includens, ore [** 

 5-lOfido. Lacinise 5 interiores antheris exterioribusque 

 oppositse et parallelse. 



MasscB pollinis infra apicem insertse. 



Stigma apiculo semibifido. 



Folliculi cylindracei, divaricati. 



Caulis volubilis. Folia cordata. 



1. C. acutum, foliis oblongo-ovatis cordatis aciitis, 

 corollse laciniis oblongis obtusis. 



Cynanchum acutum, Linn., cum synonymis. 



2. C. Monspeliacum, foliis reniformibus : apice coarctato 

 semi-lanceolato, laciniis corollse lanceolatis obtusiusculis. 



Cynanchum Monspeliacum, Linn., cum synonymis. 

 Obs. Forsan baud distinctum a priori. 



3. C. Chinense, foliis ovatis cordatis ; acumine brevi, 



