A genus of herbs many of which have radical leaves forming a rosette. The leaves are simple or lobed, sometimes toothed, without stipules. The flowers are in at least 2- or many-flowered whorls, often forming a terminal inflorescence. They are bisexual, with 5 fused sepals forming a toothed bell shape. The corolla has a short upper lip, and a larger, 3-lobed lower lip with a ring of hairs in the corolla tube. The stamens are attached to the corolla tube. The ovary is superior, with 2 bilocular carpels and 4 ovules. The fruit is an oval nutlet. There are approximately 50 species, found in the Old World in a wide variety of habitats.
Subjects: Plant Sciences and Forestry.