Many species of sunflowers, asters, and goldenrods bring up parade’s end in September and early October, some flowering well after the first autumn frost. Canada goldenrod, with a plumelike flower head, and rigid goldenrod, with a flat-topped flower head, are two of the most common species. Four species of asters are often abundant in central Iowa.
Carl Kurtz, A Practical Guide to Prairie Reconstruction
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