calcareus

Misspelling of Classical Latin calcārius (“pertaining to lime”), from calx (“limestone, lime, chalk”) +‎ -ārius. The spelling with -eus could have been influenced by the distinct suffix -eus, or it could simply be a result of the homophony of -ius and -eus in some pronunciation styles.

• (Classical Latin) IPA^(key): [kaɫˈkaː.re.ʊs]
• (modern Italianate Ecclesiastical) IPA^(key): [kalˈkaː.re.us]

calcāreus (feminine calcārea, neuter calcāreum); first/second-declension adjective

1. (New Latin) chalky (as a botanical epithet)

• Used almost exclusively as a taxonomic epithet and thus not normally in inflected forms other than the nominative singular.

First/second-declension adjective.