Reference: http://www.life.illinois.edu/help/digitalflowers/picts/Flowers/26-%205-merous,%20actinomorphic.jpg
When a flower is capable of being divided into two equal radial halves in any radial plane passing through the centre, it is said to be actinomorphic (radial symmetry).
Examples: rose, mustard, buttercup, tulip, datura, chilli etc.
