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,
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