Flower Parts Flashcards
Outermost (Accessory) whorls
Calyx - Sepals
Corolla - Petals
What can the Sepals and Petals come together to form?
Calyx tube
Corolla tube
What is the collective term for petals and sepals that are identical in form and colour?
Perianth
Characteristics of irregular form
Zygomorphic
Labiate
Hooded (Cucullate)
Keeled (two fused anterior petals)
Winged
What is a stamen?
-Collectively know as androecium.
-The male reproductive part that contains the pollen sacs.
-Filament is the shaft.
-Anther is the head.
What is a stamen?
-Collectively know as androecium.
-The male reproductive part that contains the pollen sacs.
-Filament is the shaft.
-Anther is the head.
What is pollen?
-Microscopic grains.
-Dusty and copious in wind pollinated plants.
-Less plentiful and sticky in insect-pollinated plants.
-Contains the male sexual nuclei called gametes.
What are the female floral parts?
-Collectively known as carpels or the gynaecium.
-At the base is the ovary containg ovules.
-Above the ovary is the stalk like style, there could be many.
-At the tip of each style is a stigma, which is the receptive surface for the pollen.
How is an embryo created?
-When pollen reaches the stigma at the right time it germinates.
-The nucleus grows down the style to reach the ovules.
-It then fused with the female nucleus (ovules).
-The fertilised egg then becomes an embryo and then a seed.
-The ovary will become a seed box or fruit.
What are important identification factors relating to the gynaecium?
-The number of carpels and whether or not they are fused together.
The positioning of the ovary.
What can you do if you can’t count the carpels stigma and styles?
Count the number of cells in the ovary.
What is a superior ovary?
Attatched to the hypantheum above the corolla whorl and stamens.
What is an inferior ovary?
-It has the caylx and corolla arising from it’s top.
-It can be seen below the flower in side view.
