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Flowers

Flowers. General Comments. 1. More than 240,000 species of flowering plants 2 . 11 species provide 80% of world's food 3 . Flowers are the unique characteristic of this division

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Flowers

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  1. Flowers

  2. General Comments • 1. More than 240,000 species of flowering plants • 2. 11 species provide 80% of world's food • 3. Flowers are the unique characteristic of this division • 4. Flowers range in size from tiny duckweed flowers, 0.1 mm long, to enormous Rafflesia flowers of Indonesia (1 meter in diameter) • 5. Enormous varieties of floral structure • 6. Widely varying habitats of flowering plants; from fresh water to salt water, from deserts to jungle

  3. Duck weed

  4. Duck weed (smallest flowering plant)

  5. Rafflesia

  6. Generalized flower

  7. orchid

  8. “Seagrass” is a shallow, saltwater flowering plant

  9. Structure of Flowers • A. Sterile Parts • 1. Peduncle = flower stalk • • receptacle (swollen tip of peduncle; flower parts attached here) • 2. Sepals • • sepals collectively known as the calyx • 3. Petals • • petals collectively known as the corolla

  10. Peduncle = flower stalk

  11. Sepals

  12. Petals

  13. Flower parts

  14. Complete flower

  15. Incomplete flower

  16. Fertile parts • 1. Stamens a. Filamentb. Anther • pollen grains develop here • 2. Pistil (Carpel) a. Parts 1) Stigma 2) Style 3) Ovary a) Ovules present in ovaryb) Ovules mature into seedsb. Positions of Ovary 1) Superior • calyx and corolla attached to receptacle at base of ovary 2) Inferior • calyx and corolla attached to top of receptacle which surrounds ovary

  17. Microsporogenesis and microgemetogenesis

  18. C. Flower Clusters (Inflorescences) • 1. Clusters of flowers called inflorescences

  19. Types of inflorescences

  20. The End

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