The tubers of the Mexican plant Ipomœa purga (or Exogonium purga), a climber much like the morning-glory. The abstract, extract, and powder, prepared from the tubers, are well known purgative medicines. Other species of Ipomœa yield several inferior kinds of jalap, as the I. Orizabensis, and I. tuberosa.
- A twining eastern Mexican vine (Ipomoea purga syn. I. jalapa) having tuberous roots that are dried, powdered, and used medicinally as a cathartic.
- Any of several similar or related plants.
- The dried tuberous roots of these plants.
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