convolvulus mechoacan

from The Collaborative International Dictionary of English v.0.48

Mechoacan \Me*cho"a*can\, n.
   A species of jalap, of very feeble properties, said to be
   obtained from the root of a species of {Convolvulus}
   ({Convolvulus Mechoacan}); -- so called from Michoacan, in
   Mexico, whence it is obtained.
   [1913 Webster]