Nat. ord., Convolvulaceae.
Exogonium Purga. Common Jalap.
This plant has a perennial root, that contains a large quantity of pulpy juice. The annual stem is slender, and twines to a height of 8 or 10 feet. It is a native of the Mexican Andes. The tubercles of the root are imported from Vera Cruz.
Characters. - Varying from the size of a nut to that of an orange, ovoid, the larger tubercles frequently incised, covered with a thin brown wrinkled cuticle; presenting, when cut, a yellowish-grey colour, with dark brown concentric circles.
There is a proving in Noack and Trinks.
Part employed. - The dried tubercles.
Preparation. - Tincture (rectified spirit).