Anatomy of Flowers

1. FLOWERS Group#3: Raolschild Pitchel Roberto Gene Oliver Roxas Arturo Sta. Ana III Arly Valdez Angela Abesamis Hariet Abuhin

2. Flower is the part of the shoot system specializing in sexual reproduction.

3. Parts of a Typical Flower 1. Pedicel - the stalk that holds the flower 2. Receptacle - enlarged tip of the pedicel from which the floral part arise. 3. Sepal - several leaf-like structures. It protects the flower while is still a bud. 4. Calyx - collective term for sepals. 5. Petal - coloured leaf-like structures that occurs in one or more circles within the sepals. 6. Corolla - collective term for petal. 7. Perianth - term for calyx and corolla.

4. Parts of a Typical Flower 8. Pistil ( gynoecium )- seed-bearing organ of the flower; usually pear-shaped and found at the center of the flower. It is composed of ovary, style, and stigma. a. Style - long and slender neck-like part extending from the ovary. It serves as a passageway for the pollen from the stigma to the ovary. b Stigma - sticky part found at the tip of the style to which the pollen adheres after pollination. c . Ovary - enlarged basal part of the pistil. It can have one or more locules (cavities) containing ovules that develop into seeds after fertilization. c.1. Ovules - small, round or oval-shaped bodies Inside the locules of the ovary. They contain the egg cell. c.2. Locules - the cavity within the ovary.

5. Parts of a Typical Flower 9. Stamen ( androecium )- the essential male part of the flower consisting of an anther and a filament. a. Anther - where pollen grains are produced. It is supported by the slender filament and usually consists of four pollen sack. b. Filament - the slender stalk that supports the anther.

6. Classification of Flowers

7. Presence or Absence of Floral Parts Complete Flower - a flower that has all the four essential floral parts: the sepal, petal, stamen and pistil. Incomplete Flower - a flower that lacks one or more of the four floral parts. Perfect Flower - a flower with both the stamen and pistil (may lack sepals and petals); also called bisexual flowers. Imperfect Flowers - a flower that bears either the stamen or pistil. The flower may be staminate or pistillate . It is called a unisexual flower.

8. Size and Shape of Floral Parts Regular Flower - a flower in which the corolla is made up of similarly-shaped petals equally spaced and radiating from the center of the flower. Irregular Flower - a flower in which one or more members of at least one whorl are of a different form or sized from the others. a. Papilionaceous - the standard petal or banner is usually the largest and most striking. b. Caesalpinaceous - the standard petal is the smallest and innermost. c. Orchidaceous - has three petals; one is very much different in size and shape and is called the lip or labellum .

9. Symmetry Radial symmetry - symmetry in which a flower is divisible on more than one axis into two equal halves that are mirror images of each other. This is also known as regular or actinomorphic. Bilateral symmetry - symmetry in which a flower is distinctly divisible into right and left sides, i.e., divisible into mirror images on only one axis. It is also known as irregular or zygomorphic symmetry.

10. Position of the Ovary Perigynous - a flower in which the ovary is half-interior but the bases of the stamens, petals, and sepals develop as a floral cup around the ovary. Hypogynous - a flower in which the ovary is superior, with the stamens, petals, and sepals arising from a level below the base of the ovary. Epigynous - a flower in which the ovary is inferior, with the stamens, petal, and sepals arising from a level above the base of the ovary.