The Liliopsida are the class of flowering plants traditionally classified as monocotyledons. The monocots produce a single seed leaf that pushes through the soil when they germinate as against the pair of seed leaves produced by dicots. About one fifth of the flowering plants are monocots, about 50,000 species, and they include daffodils, bromeliads, lilies, irises, palms, orchids, sedges, rushes and grass. The grasses are of enormous economic importance, including as they do the cereals, and other food plants that are monocots include bananas, dates, pineapples, coconuts yams and onions. The monocots are listed under their family names.