The Flower What is the function of the flower for the plant?
Reproduction of Flowering Plants Accessory Flower Parts • Sepals – leaf like, green structures that encircle the flower stem beneath the petals • Petals – leaf like, colorful structures arranges in a circle called a corolla around the top of a flower stem
Kinds of Flowers • Complete – a flower that has all 4 organs (sepals, petals, stamens and pistils) • Incomplete – a flower that lacks one or more organs • Male – have stamens but no pistils • Female – have pistils but no stamens
Reproductive Flower Parts • Stamen (male) • filament – the long structure that supports the anther • anther – the structure at the tip of the filament that produces pollen containing sperm
POLLEN GRAINS • A pollen grain is an immature male gametophyte. • Pollen grains are extremely durable; they have tough coats.
B. Pistil (female) • stigma – at the top of the pistil; a sticky or feathery surface on which the pollen grains land and grow • style – the slender stalk of the pistil that connects the stigma to the ovary • ovary – eventually becomes the fruit; contains the ovules • ovules – will become seeds if they are fertilized
The Female Pistil pistil
Use the diagram on page 612 to draw a typical flower and label the accessory and reproductive parts.
MONOCOT ORDICOT • Count the petals or stamen • Monocots = flower parts in multiples of 3 • Dicots = flower parts in multiples of 4 or 5
Is this plant a monocot or a dicot? How do you know? 3 petals, 3 sepals (or 6 tepals)