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Ballota africana
http://www.plantzafrica.com/plantab/ballotafric.htm
Photo, description, distribution, economic value, and references.
Ballota hirsuta
http://www.uib.es/depart/dba/botanica/herbari/generes/Ballota/hirsuta/Ballota_hirsuta(gral)_f_s.jpg
photo
Ballota nigra
http://www.dipbot.unict.it/orto/1094-1.html
Image of this species.
Ballota undulata
http://www.tau.ac.il/~ibs/album/ballota.u.htm
Closeup photo of this plant.