– water hyacinth
Distribution: Known from a few localities in southern Washington; California east along the southern part of the U.S. to Florida.
Habitat: Ponds, ditches, canals.
Origin: Introduced from tropical America
– grassleaf mud-plantain, water stargrass
Distribution: In scattered localities in Washington, however locally common and abundant in lower Yakima River; British Columbia south to California, widespread in eastern North America.
Habitat: Quiet streams, ponds and lakes.