Ruppia didyma Sw. ex Wikstr. Ruppia didyma Sw. ex Wikstr. in Kongl. Vetensk. Acad. Handl. 1825: 427. 1825 sec. Ramírez García-Armora 2013=Ruppia anomala Ostenf. in Bull. Torrey Bot. Club 42: 659. t. 32. 1915 syn. sec. Espejo-Serna & López-Ferrari 2008