Anatomy of Zinnia

Anatomy of Zinnia flower

Pollen of a Zinnia





Petals of Zinnia flower



Composites of Zinnia


Anatomy of stem

General Flower ( has both genders in a flower )

The mature flower has both stamen and ovary. Stamen is the male organ used to produce pollen. The ovary is the female organ were the fertilization happens.
Stamens consist of two parts: a stalk called a filament, topped by an anther where pollen is produced by meiosis and eventually dispersed.
Ovules give rise to egg cells.
The sticky tip of the pistil, the stigma, is the receptor of pollen. The supportive stalk, the style, becomes the pathway for pollen tubes to grow from pollen grains adhering to the stigma.


Exception ( has only one gender flower )
The staminate is the male flower while the pistillate is the female  flower. An example of an only sex flower is the Catkins of the willow tree. Only one gender flower can not do the self-fertilization. It has to do cross-fertilization with other factors' helps such as bee, butterfly, wind, and birds.
   Male Catkin

Female Catkin