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Obscure; most authorities credit the name to Michael Adanson (1727 - 1806), who named the species after a friend M. Oft. The name was unexplained.
orthos, = straight; (in height), upright, standing erect; (in line), a straght line; cheilos¸= a lip.
For Osmund,** the waterman or for the Anglo-Saxon equivalent of Thor, god of thunder. The derivation of this family name is obscure. Jackson gives five possibilities, but doubt remains as to which, if any, are correct.