Water hyacinth belongs to seed plants. From a scientific classification perspective, water hyacinth (also known as water hyacinth or water hyacinth) belongs to the plant kingdom, angiosperm phylum, monocotyledonous plant class, duckweed order, and rain lily family, and is a species of water hyacinth. Angiosperms are a subphylum of the seed plant phylum, and their seeds have a fruit skin coating on the outer layer. The seeds of water hyacinth have this feature, so they belong to angiosperms, also known as seed plants.