Abstract
Two species of Hydrocharitaceae were found in the canga formations of the Serra dos Carajás, Pará state, Brazil: Ottelia cf. brasiliensis, the first record of the genus in the state of Pará, and Apalanthe granatensis. Detailed descriptions, comments, and illustrations of the species are presented.
Key words:
Apalanthe; FLONA Carajás; new record; Ottelia; Pará state