Ballota nigra L.  
Family: Lamiaceae
black horehound
[Ballota nigra subsp. ruderalis L., Ballota ruderalis Sw.]
Ballota nigra image
from USDA Plants website  
Etymology: Ballota: Greek but of uncertain origin
Plants: perennial, 12"-32" tall forb, aromatic, hairless; stems square
Leaves: opposite, short-stalked, oval to round, coarse rounded teeth at the edges
Flowers: pink to white, 5-parted, 1/2" long, strongly 2-lipped with the upper lip hairy and not divided flower drawing; inflorescence 4-8 flowered, separated whorls from the upper leaf axils; blooms June-Sept.
Fruits: 1-seeded nutlet
Habitat: disturbed areas
Conservation Status: Introduced - adventive
Ballota nigra image
Botanical Illustration  
Ballota nigra image
Emmet J. Judziewicz  
Ballota nigra image
Botanical Illustration  
Ballota nigra image
Thomas Schöpke  
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