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Tall Coreopsis (Coreopsis tripteris) is more impressive when it occurs in loose colonies, rather than as a stand-alone specimen. Each plant has a tendency to sway with the passage of every breeze during a sunny afternoon, exerting a hypnotic effect. Tall Coreopsis can be distinguished from other Coreopsis spp. in Illinois by its greater height, later period of bloom, and flowerheads with dark purple or maroon centers. In contrast, most Coreopsis spp. have flowerheads with yellow centers. Because of its greater height, Tall Coreopsis could be confused with one of the sunflowers (Helianthus spp.), but it is readily distinguished from them by its odd-pinnate leaves. In contrast, sunflowers have simple leaves.

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© John Hilty

Source: Illinois Wildflowers

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