English: Side-by-side comparison of Aster vs Daisy phyllaries, the most robust distinction between these two similar-looking genera (Aster and Erigeron). Phyllaries are the individual bracts in the whorl around the base of the flowers in a composite flower head. In asters (left), the phyllaries are short, in several shingle-overlapped rows, while in daisies (right) they are long and parallel, in a single row.
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