[1] : The Collaborative International Dictionary of English v.0.48

jalap \jal"ap\, n. f., fr. sp. jalapa; -- so called from
   jalapa, a town in mexico, whence it was first obtained.
   med.
   the tubers of the mexican plant ipomoea purga or
   exogonium purga of the family convolvulaceae, a climber
   much like the morning-glory. the abstract, extract, and
   powder, prepared from the tubers, are well known purgative
   cathartic medicines, and are also called jalap. other
   species of ipomoea yield several inferior kinds of jalap,
   as the ipomoea orizabensis, and ipomoea tuberosa.
   1913 webster

   false jalap, the root of mirabilis jalapa, four-o'clock,
      or marvel of peru.
      1913 webster
see also:
ipomoea purga exogonium purga convolvulaceae ipomoea ipomoea orizabensis ipomoea tuberosa 
false jalap mirabilis jalapa 

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