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Marrubium (Lamiaceae) 3:550 |
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| 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).
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