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well known purgative medicines. Other species of Ipomoea yield several inferior kinds of jalap, as the I. Orizabensis, and I. tuberosa. False jalap, the root of Mirabilis Jalapa, four-o'clock, or marvel of Peru.

Of or pertaining to jalap.

A glucoside found in the stems of the jalap plant and scammony. It is a strong purgative.

A glucoside occurring in jalap (the root of a convolvulaceous plant), and extracted as a colorless, tasteless, gummy mass of powerful purgative properties.

f a dozen species, natives of the warmer parts of America. The common four- o'clock is M. Jalapa. Its flowers are white, yellow, and red, and open toward sunset, or earlier in cloudy weather; hence the name. It is also called marvel of Peru, and afternoon lady.

ining to, or designating, an acid obtained by the oxidation of convolvulin (obtained from jalap, the tubers of Ipomoea purga), and identical in most of its properties with sebacic acid.

A species of jalap, of very feeble properties, said to be obtained from the root of a species of Convolvulus (C. Mechoacan); -- so called from Michoacan, in Mexico, whence it is obtained.