Prionium serratum, the
palmiet, is a robust, evergreen, semiaquatic, rhizomatous flowering plant growing to 2 m (6 ft 7 in) in height. It is the only species in the genus
Prionium, and is endemic to South Africa (Cape Province and KwaZulu-Natal). Some authors have separated
Prionium from the Thurniaceae, putting it instead in its own family, the
Prioniaceae.
(Wikipedia)