Eichhornia azurea (Sw.) Kunth
anchored water-hyacinth, rooted water-hyacinth
Fruit a capsule with numerous seeds. Seeds terete, oblong to narrowly oblong in outline, ca. 1.5–2.6 mm long, 0.3–0.9 mm wide and thick, with ca. 10 longitudinal ridges or membranous wings evenly spaced around seed. Testa light yellow-orange to yellow-brown; surface with glistening, fine horizontal striations in between ridges. Hilum terminal, often with persistent funiculus 0.4–0.6 mm long; chalazal end obtuse or depressed and often darker in color. Embryo axile-linear; endosperm readily visible.
Eichhornia crassipes (Sw.) Kunth (non-FNW)
Heteranthera limosa (Sw.) Willd. (non-FNW)
Monochoria hastata (L.) Solms-Laub.
Monochoria vaginalis (Burm. f.) C. Presl.
native to Mexico, Central America, and South America, also Jamaica; introduced to India, Iran, and the United States
in mud along rivers, lakes, marshes, canals
Eichhornia azurea is a perennial aquatic plant with submersed and emersed leaves, up to 100 cm tall. In the neotropics, with other aquatic plants, it forms floating masses that obstruct navigation. Propagation is by whole plants, stem fragments, fruits, and seeds. Eichhornia azurea was introduced into the U.S. as an aquatic ornamental but has not become established as a weed here.