Dogwood flower

Dogwood flower is a species of flowering plant in the family Cornaceae. This flower has a technical name: Cornus florida. Dogwood trees grow and bloom over most of the eastern half of the United States and along the Pacific Coast in U.S. Under ideal conditions, the trees can reach a height of around 30 feet, with multilayered branches that can spread out to about 20 feet.


Picture found on: https://nature.mdc.mo.gov/discover-nature/field-guide/flowering-dogwood
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Interesting fact: The four showy dogwood flower petals aren’t actually petals as botanists define them. The dogwood petals instead are modified leaves called bracts that surround a cluster of about 20 tiny yellow flowers. As the flowers bloom, the showy bracts expand to attract pollinating insects. Each bract has a dark red-brown indentation at its tip. 

Common Name	Scientific Name	Pollen size (µm)	Pollen Type	Number of Apertures	Surface Texture
Dogwood	Cornus florida	22µm   39µm	tricolpate	3	smooth

Link for informations: http://homeguides.sfgate.com/fast-dogwood-flowers-69805.html