A Grammatical Dictionary of Botanical Latin

Calypso, gen.sg. Calypsois (s.f.III) [note that the ‘ps’ is the Gk. letter ‘psi’]: classical forms of the noun include (acc.) Calypso and Calypsonem; also CalypsOn; genitive Calypsus and Calypsonis. “a nymph, the daughter of Atlas, who detained Ulysses on the island Ogygia” (Glare); “a nymph, daughter of Atlas, who lived in the island Ogygria and concealed Ulysses on his way back from Troy” (Liddell & Scott);

NOTE: the genitive sg. for the name of the genus Calypso Petit-Thouars as “calypsois” follows DeCandolle, used as an epithet of Salacia (Hippocrateaceae), but with a query as to the generic placement:

- [Hippocratea] Hippocrateae ovatae, spermodermium et cotyledones intus singulari modo filis innumeris tracheiformibus stuposi! [sic] quod etiam in Calypsois [sic] suae pericarpio vidit cl. Petit-Thouars. (DeCandolle), plants of the Hippocrateae ovate, the spermodermium and cotyledons inside stupose! [i.e. matted with tow-like filaments] in a singular manner with innumerable tracheiform threads, which the well-known Petit-Thouars saw even in Calypso’s own pericarp [i.e. in the pericarp of Calypso itself].

NOTE: Petit-Thouars is the author of the genus Calypso.