Read the following matches 
(i) Datura- Actinomorphic flower
(ii) Canna-Zygomorphic flower
(iii) Gulmohur-Zygomorphic flower
(iv) Cassia-Asymmetric flower
     Which of these are correct?

In symmetry, the flower may be actinomorphic (radial symmetry) or zygomorphic (bilateral symmetry). When a flower can be divided into two equal radial halves in any radial plane passing through the centre, it is said to be actinomorphic, e.g., mustard, datura, chilli. 
When it can be divided into two similar halves only in one particular vertical plane, it is zygomorphic, e.g., pea, gulmohur, bean, Cassia. 
A flower is asymmetric (irregular) if it cannot be divided into two similar halves by any vertical plane passing through the centre, as in canna.