A small family, widely distributed; perennial herbs, with creeping rootstocks, growing in water or marshes; the leaves smooth, alternate, or from the root; the flowers perfect, regular, in clusters; the calyx five-lobed; the corolla more or less funnel-form with five lobes or teeth; the stamens five, on the corolla and alternate with its lobes; the ovary superior, or partly so, with one cell; the fruit usually an oval capsule, with a few flattish, smooth seeds.

Buck bean  Menyanthes trifoliata

Buck-bean- Menyanthes trifoliata. MORNING GLORY FAMILY. Convolvulaceae.