Note
Plants that occur in shallow lagoons from Sebastian Inlet to Biscayne Bay on the Atlantic coast of Florida are described as a new species, Halophila johnsonii, in section Halophila. Pistillate flowers have been observed from April to July and fruits in August, but staminate flowers have not been collected, suggesting that H. johnsonii may be apomictic. The plants have previously been referred to as H. decipiens Ostenfeld, a pantropical species that is found at depths of 20 m on the continental shelf along the Atlantic coasts of Florida.