Basil (Ocimum basilicum). More pictures of herbs in Herb Garden.
If you want more information about this flower, just search the plant's Latin (botanical) name on Google:
Basils are members of the family Lamiaceae. These plants, as well as oils from them, have received lots of attention for their potential medicinal properties. Of these plants, O. basilicum is the most widely used. It is used in cosmetics, liqueurs, medicines, and perfumes.