Marrubium peregrinum (horehound) is a species of herbaceous perennial plant, with height up to 60 cm, native to south-east Europe, the Balkans, and Asia Minor.
Synonyms Atirbesia bracteata Raf. Marrubium affine Host Marrubium angustifolium Moench Marrubium candidissimum L. Marrubium candidissimum Orsini ex Ten. Marrubium civice Klokov Marrubium creticum Mill. Marrubium creticum Roth Marrubium flexuosum Moench Marrubium odoratissimum Pourr. ex Steud. Marrubium pannonicum Rchb. Marrubium pauciflorum Wallr. Marrubium peregrinum var. creticum (Mill.) Nyman Marrubium pestalozzae auct. Marrubium praecox Janka Marrubium remotum Janka Marrubium rubrum Roth Marrubium setaceum Desr. Marrubium uncinatum Hornem.
References Carl Linnaeus, Species Plantarum 2, 1753, p. 582. The Plant List entry
Encyclopedia of Life entry