Italian Arum, Italian Lords-and-Ladies, Italian Lords and Ladies, Orange Candleflower: Arum italicum ssp. italicum (Synonym: Arum italicum) - Introduced from Europe. Naturalized.
Dragon Arum: Dracunculus vulgaris - Exotic, not naturalized.
Dotted Duckweed: Landoltia punctata (Synonyms: Spirodela oligorrhiza, Spirodela punctata) - Exotic, naturalized.
Fat Duckweed, Inflated Duckweed: Lemna gibba
Common Cuckweed, Lesser Duckweed, Water Lentil: Lemna minor (Synonym: Lemna minima)
Least Duckweed: Lemna minuta
Ivy Duckweed, Ivy-leaved Duckweed, Star Duckweed: Lemna trisulca
Turion Duckweed: Lemna turionifera
Skunk Cabbage, Yellow Skunk Cabbage: Lysichiton americanus (Synonyms: Lysichiton camtschatensis, Lysichitum americanum)
Arrow Arum,Green Arrow Arum, Tuckahoe: Peltandra virginica (Synonym: Arum virginicum) - Inroduced from eastern North America.
Water Lettuce: Pistia stratiotes - Exotic, not naturalized.
Common Duckmeal, Duckmeal, Greater Duckweed: Spirodela polyrhiza (Synonyms: Lemna polyrrhiza, Spirosela polyrrhiza, Spirodela poyrrhiza var. masonii)
Northern Watermeal: Wolffia borealis (Synonym: Wolffia punctata)
Brazilian Watermeal: Wolffia brasiliensis (Synonyms: Wolffia papulifera, Wolffia punctata)
Columbia Water Meal, Columbian Watermeal: Wolffia columbiana
Sword Bogmat, Mud-midget: Wolffia gladiata (Synonyms: Wolffia floridana, Wolffiella gladiata var. floridana) - Introduced from the eastern US.
Calla-lily: Zantedeschia aethiopica - Exotic, naturalized.