Lacking a calyx; descriptive of flowers that have no external covering of sepals or calyx at the base.
From 'a-' (without) + 'calycin' (relating to calyx) + '-ous' (characterized by). This is another variant of acalycal/acalycine using the '-ous' suffix.
Medieval botanists invented multiple ways to say 'no calyx'—acalycal, acalycine, and acalycinous all exist, showing how scientific naming evolved with competing terminology before modern standardization finally settled on preferred forms.
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