black horehound

World English Dictionary
black horehound
 
n
a hairy unpleasant-smelling chiefly Mediterranean plant, Ballota nigra, having clusters of purple flowers: family Lamiaceae (labiates)

Collins English Dictionary - Complete & Unabridged 10th Edition
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WordNet
black horehound

noun
ill-smelling European herb with rugose leaves and whorls of dark purple flowers 
WordNet® 3.0, © 2006 by Princeton University.
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