in botany, a genus of the pentandria monogynia clas. The corolla is rotated, and somewhat unequal; and the capsule has two cells, and two valves. There are twelve species, four of them natives of Britain, viz., the thapsus, or great white mullein, the leaves of which are emollient; the lychnitis, or hoary mullein; the nigrum, or black mullein; and the blattoria, or yellow moth-mullein.