| Taxon | Ophioglossum californicum |
| group | Ferns |
| Family | Ophiglossaceae |
| Family common name(s) | adder's-tongue; adder's tongue; moonwort fern |
| Genus common name(s) | adder's-tongue fern; adder's tongue fern; adder's-fern; adder's fern; snake's tongue |
| Species common name(s) | California adder's-tongue; California adder's tongue; California adders-tongue: California adders tongue: California adderstongue: California adder's-tongue fern; California adder's tongue fern; California adders-tongue fern; California adders tongue fern; western adder's-tongue; western adder's tongue; western adder's-tongue fern; western adder's tongue fern |
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| Common name(s) generally applied to other taxa or multiple taxa | adder's-grass, adder's grass, adder's-spear, adder's spear, adder's-tongue, adder's tongue, adderstongue, adders tongue, adder tongue are applied to taxa in multiple families |
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| Synonymy: The Jepson Manual (1993), FNA, PLANTS, etc | Ophioglossum lusitanicum L. subsp. californicum (Prantl) R.T. Clausen |
