"Ophioglossum crotalophoroides Walter" . . "Ophioglossum crotalophoroides" . . "Streptophyta" . "Ophioglossales" . . "Ophioglossopsida" . "Walter" . "Bulbous Adderstongue" . . . "Ophioglossaceae" . . . "Plantae" . . . . . . . "Ophioglossum" . .