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.
bStigma- 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.
8. PRESENCE OR ABSENCE OF FLORAL
PARTS
1. Complete Flower- a flower that has all the four
essential floral parts: the sepal, petal, stamen and
pistil.
2. Incomplete Flower- a flower that lacks one or
more of the four floral parts.
3. Perfect Flower- a flower with both the stamen and
pistil (may lack sepals and petals); also called
bisexual flowers.
4. Imperfect Flowers- a flower that bears either the
stamen or pistil. The flower may be staminate or
pistillate. It is called a unisexual flower.
9. SIZE AND SHAPE OF FLORAL
PARTS
1. 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.
2. 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.
10. SYMMETRY
1. 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.
2. 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.
11.
12. POSITION OF THE OVARY
1. 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.
2. 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.
3. 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.
