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Marrubium (Lamiaceae) 3:550   Marrubium vulgare (white horehound) is a common weed. The flowers are very small, white, highly asymmetrical and clustered in the upper leaf axils. The whole plant is pale coloured. The corollas are highly asymmetrical, and the calyces have 10 hooked teeth (see picture).

University of Tasmania report issues