Twining plant of Asia Minor having cream-colored to purple flowers and long thick roots yielding a cathartic resin WordNet 3.0 & Open English WordNet

Convolvulus scammonia, known commonly as scammony, is a bindweed native to the countries of the eastern part of the Mediterranean basin; it grows in bushy waste places, from Syria in the south to the Crimea in the north, its range extending westward to the Greek islands, but not to northern Africa or Italy. Wikipedia

Convolvulus scammonia, a twining perennial bindweed native to the eastern part of the Mediterranean basin, whose juice has been used in medicine as scammonium. Wiktionary

Bindweed. Wiktionary (translation)