Describing a plant that has flowers arranged in a dense head-like cluster.
From Greek 'kephalē' (head) + 'anthos' (flower) + '-ous' (suffix forming adjectives). This is the adjectival form describing plants with head-shaped flower arrangements.
When botanists look at a sunflower, they're not seeing one flower but thousands of tiny cephalanthous flowers arranged so tightly together that it looks like a single massive bloom!
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