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DESCRIPTION:
Sunflowers are large, rough, hairy broadleaf plants with large yellow flower heads. They may be
summer annuals or perennials and have single or branched stems, depending on species. Cotyledons (seed leaves)
leaves are bright green and two to three times as long as wide. Stems of mature plants are thick and
covered with coarse hair. The spade-shaped leaves range from several inches (8 cm to 15 cm) to nearly a
foot (30 cm) across. Flowers are arranged in dense heads with a dark center surrounded by a halo of yellow to
orange petals. When mature, the center (disk) of the flower head holds scores of seeds that are very
attractive to birds.
Broadleaf ID illustration.
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