Definitions for ballota nigra
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Princeton's WordNet
black horehound, black archangel, fetid horehound, stinking horehound, Ballota nigra(noun)
ill-smelling European herb with rugose leaves and whorls of dark purple flowers
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"ballota nigra." Definitions.net. STANDS4 LLC, 2013. Web. 23 May 2013. <http://www.definitions.net/definition/ballota nigra>.

