jalap
Sign in to savethumb|right|Chemical structure of scammonin|scammonin I, one of the primary chemical constituents of jalap Jalap is a cathartic drug, largely obsolete in Western medicine, consisting of the tuberous roots of Ipomoea purga, a convolvulaceous plant growing on the eastern declivities of the Sierra Madre Oriental of Mexico at an elevation of above sea level, more especially about the neighbourhood of Chiconquiaco on the eastern slope of the Cofre de Perote in the state of Veracruz.
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thumb|right|Chemical structure of scammonin|scammonin I, one of the primary chemical constituents of jalap Jalap is a cathartic drug, largely obsolete in Western medicine, consisting of the tuberous roots of Ipomoea purga, a convolvulaceous plant growing on the eastern declivities of the Sierra Madre Oriental of Mexico at an elevation of above sea level, more especially about the neighbourhood of Chiconquiaco on the eastern slope of the Cofre de Perote in the state of Veracruz.
Jalap has been known in Europe since the beginning of the 17th century, and derives its name from the city of Xalapa in Mexico, near which it grows, but its botanical source was not accurately determined until 1829, when Dr. J. R. Coxe of Philadelphia published a description.