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 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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