How many of the given plants have actinomorphic flowers?
  Radish, Tulip, Ashwagandha, Lupin, Cassia, Canna, Asparagus, Lily, Datura, Mustard, Chilli, Tobacco.

Cassia and  Lupin are zygomorphic, while Canna  is irregular.

When a flower can be divided into two equal radial halves in any radial plane passing through the center, it is said to be actinomorphic.

When it can be divided into two similar halves only in one particular vertical plane, it is zygomorphic,

A flower is asymmetric (irregular) if it cannot be divided into two similar halves by any vertical plane passing through the centre.