Dogwood flowers at Lenora Park in Snellville, GA.

The cross is symbolized in the dogwood flower:

Four Petals: The dogwood flower’s four petals are said to represent the cross. 

Nail Marks: The indentations at the tips of the petals are said to resemble the nail holes from the crucifixion. 

Crown of Thorns: The center of the flower, with its tight grouping, is said to resemble the crown of thorns.

 Blood: The red markings sometimes found on the petals are said to represent the blood shed by Jesus.