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Ord. Cystineae; Sex. Syst. Polyandria Monogynia. The systematic name of the plant whence the Labda'num, Labda'men or Lada'num, Gum'thi Labda'num, is obtained. Lada'num is a gum-resinous substance, of a very agreeable smell, found in the shops in great masses. Its colour is blackish-green; taste, warm and bitter. It is but little used now. Formerly, it was a component of warm plasters, and was prescribed internally as a stomachic. Ladanum is also obtained from Cistus ladanif'erus, and C. laurifo'lius.

The rock rose; indigenous to Crete and other regions of the Mediterranean; one of the chief sources of ladanum.