"Ophioglossum." A Dictionary of Plant Sciences. . Encyclopedia.com. (February 20, 2018). http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/ophioglossum
"Ophioglossum." A Dictionary of Plant Sciences. . Retrieved February 20, 2018 from Encyclopedia.com: http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/ophioglossum
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adder's-tongue, name for a fern genus (Ophioglossum). Adder's-tongues are classified in the division Pteridophyta.
"adder's-tongue." The Columbia Encyclopedia, 6th ed.. . Encyclopedia.com. (February 20, 2018). http://www.encyclopedia.com/reference/encyclopedias-almanacs-transcripts-and-maps/adders-tongue
"adder's-tongue." The Columbia Encyclopedia, 6th ed.. . Retrieved February 20, 2018 from Encyclopedia.com: http://www.encyclopedia.com/reference/encyclopedias-almanacs-transcripts-and-maps/adders-tongue