convolvulus(n = noun.plant) - any of numerous plants of the genus Convolvulus;
is a kind of vine
is a member of genus convolvulus
has particulars: convolvulus scammonia, scammony

   A large genus of plants having monopetalous flowers, including the common bindweed (Convolvulus arvensis), and formerly the morning-glory, but this is now transferred to the genus Ipomæa. [1913 Webster]
"The luster of the long convolvuluses
That coiled around the stately stems." [1913 Webster]

convolvulus, n. any twining plant of the genus Convolvulus, with trumpet-shaped flowers, e.g. bindweed.

Etymology:
L

convolvulus arvensis, convolvulus scammonia, convolvulus sepium, genus convolvulus