Any of various species of buttercup, or the marsh marigold, Caltha palustris.
Any of various species of lily growing in wet habitats.
Ottelia ovalifolia
Saururus spp. (lizard's tail)
Zephyranthes atamasco (rain lily, Atamasco lily)
Some species of Crinum, including Crinum americanum (southern swamplily), Crinum erubescens, Crinum pedunculatum (also river lily or mangrove lily)
Lilium superbum (also Turk's cap lily, turban lily, lily royal, or American tiger lily)