Tisanes are also commonly known as "herbal teas," "herbal infusions" or "infusions," or "botanicals." They are not technically teas.
Common tisanes include chamomile, mint and rooibos. Some tisanes are blended with actual teas to create tea blends.
By Lindsey Goodwin, About.com Guide
Clockwise from top left, chamomile flowers, lemon verbena leaves, mixed dried fruits/berries, a cocoa nib/spice/rooibos blend and a seed/spice/lemongrass blendLindsey Goodwin