"Plantae" . . "Lycopodiophyta" . "Selaginellaceae" . . "Selaginellales" . . . . . . . "Selaginella ludoviciana A. Braun" . "Selaginella ludoviciana" . . "A. Braun" . . "Lycopodiopsida" . . . "Selaginella" . "Gulf Spikemoss" . .