In botany, flowering or blooming only once in a lifetime; producing flowers a single time before dying.
From Greek 'hapax' (once) combined with 'anthos' (flower), literally 'flowering once,' contrasted with polycarpic (flowering multiple times).
Agave plants famously bloom hapaxanthous, storing energy for decades before one spectacular flowering event—it's nature's version of a once-in-a-lifetime concert tour that ends in death.
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