Describing plants that have the most primitive form of self-fertilization, where flowers never open and pollination occurs within the unopened flower bud.
From Greek 'archi-' (primitive, first) combined with 'kleistos' (closed) and 'gamos' (marriage/union). This term describes the simplest reproductive strategy in self-fertilizing plants.
Some plants have evolved such effective closed-flower reproduction that they never need to open their petals—it's a survival strategy so successful that certain species have relied on it for millions of years.
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