Nymphoides grayana (Griseb.) Kuntze: first record of Menyanthaceae for the state of Tocantins

Nymphoides grayana (Menyanthaceae) is a macrophyte, and its occurrence is known in Brazil only for the states of Mato Grosso and Mato Grosso do Sul. In this paper, a new record of N. grayana is presented for the state of Tocantins, representing the first record of Menyanthaceae for the state and expanding the occurrence of the species for the North Region of Brazil