Threadleaf "Zagreb" (Coreopsis verticillata) is a North American species of tickseed in the sunflower family.

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Keywords: asteraceae, blossom, botanical, botany, calliopsis, coreopsis, environment, flora, floral, flower, garden, gardening, greenhouse, horticultural, horticulture, natural, nature, outdoor, park, petal, plant, spring, summer, sunflower, threadleaf, tickseed, verticillata