swamp plant vs greater water parsnip

Other hyponyms of swamp plant include lesser spearwort, Ranunculus flammula, greater spearwort, Ranunculus lingua, Caltha palustris, cowslip, kingcup, marsh marigold, May blob, meadow bright, water dragon, rush, Acorus calamus, calamus, flagroot, myrtle flag, sweet calamus, sweet flag, Calla palustris, water arum, wild calla, Lysichiton americanum, skunk cabbage, foetid pothos, polecat weed, skunk cabbage, Symplocarpus foetidus, iva, marsh elder, sedge, cattail, sabbatia, yellow-eyed grass, Alisma plantago-aquatica, water plantain, arrow grass, Triglochin maritima, grass-of-Parnassus, parnassia, Chelone glabra, shell-flower, shellflower, snake-head, snakehead, turtlehead, American brooklime, brooklime, Veronica americana, brooklime, European brooklime, Veronica beccabunga, Sium suave, water parsnip, Sium latifolium, Sium sisarum, skirret, lizard's-tail, Saururus cernuus, swamp lily, water dragon.