ON THE ASCLEPIADE.E. 221 



CYNANCHUM. [Cynanchi sp. Linn. 



Char. Corolla subrotata, 5partita. 



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

 antheris oppositis. 



Anther a membrana terminatse. 



Masses pollinis ventricosae. pendulse. 



Stigma apiculatum. 



Follicidi laeves. Semina comosa. 



Habitus. Plants perennes, vcl suffrutices, utpluriinum 

 volubiles. Folia opposita. TJmbelloe interpetiolares. 



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

 aust. 



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

 iiean 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 such sections as will probably hereafter be considered 

 distinct genera. 



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

 5-10fido. Laciniae 5 interiores antheris exterioribusque 

 opposita^ et parallels. 



Masses pollinis infra apicem insertse. 



Stigma apiculo semibifido. 



Follicidi cylindracei, divaricati. 



Caulis volubilis. Folia cor data. 



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



corollas laciniis oblongis obtusis. 



Cynanchum acutum, Linn., cum synonymis. 



2. C. Monspeliacum, foliis reniformibus : apice coarctato 

 semi-lanceolato, laciniis corollas lanceolatis obtusiusculis. 



Cynanchum Monspeliacum, Linn., cum synonymis. 

 Obs. Forsan haud distinctum a priori. 



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



