Flora of Espírito Santo: Pontederiaceae.

Pontederiaceae is a small family of Monocots, composed of two genera (i.e., Heteranthera and Pontederia) and ca. 40 species. Two genera and 27 species are accepted for Brazil. In the state of Espírito Santo, Heteranthera is represented by two species and Pontederia by four species. Its species are exclusively found growing in aquatic or paludal, perennial or seasonal environments. We present descriptions, comments, and illustrations for the species. [ABSTRACT FROM AUTHOR]