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A complete flower is a fundamental reproductive structure in angiosperms, meaning flowering plants. It consists of four distinct organs attached to a receptacle: sepals, petals, stamens, and carpels.

  • Sepals (collectively the calyx) are typically green and protect the flower bud.
  • Petals (collectively the corolla) are often colorful and serve to attract pollinators.
  • Stamens (collectively the androecium) are the male reproductive parts, producing pollen.
  • Carpels (collectively the gynoecium) are the female reproductive parts, containing ovules that develop into seeds after fertilization.

The calyx and corolla together form the perianth. While sepals and petals are accessory organs, stamens and carpels are directly involved in sexual reproduction. Flowers can be complete or incomplete (missing one or more organs) and bisexual (having both male and female parts) or unisexual.123

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