Description: Waterplants with stolons often present.
Submersed leaves phyllodia, sessile; floating leaves long-petiolate, petioles terete, septate; blade orbiculate to oblong-lanceolate, base cordate, apex mucronate to obtuse.
Inforescences occasionally proliferating with stolons, leaves; scape septate; bracts subtending pedicel, distinct, elliptic to lanceolate, shorter than pedicel, delicate. Flowers: sepals persistent, erect, green, lanceolate, leathery, apex hoodlike; petals erect to spreading, yellow to white, orbiculate; stamens in [1–]4–5 rows, outer often sterile; pistils terete, linear-lanceoloid, attenuate into style, style curved inward, apex papillose.
Fruits ± terete, linear-lanceoloid, membranous, dehiscing along adaxial margins. Seeds 50 or more, sparsely to densely glandular-pubescent.
Distribution and occurrence: 5 species; North America; South America.
Text by Louisa Murray
Taxon concept: Flora of North America. Volume 22