It looks like a chrysanthemum to me, I don't normally like green flowers but against the dark leaves it looks very effective

It's a chrysanthemum, looks like a spider type, might be one of the newly revived 'Shamrock' varieties - not available as plants, bit tender. Much loved by florists though.

hi casso im no expert but it looks like a species of a chrysanthemum could well be wrong though

I like your new avatar Bamboo....... :0))

It is Chrysanthemum Green Mist, there is also a similar one called C. Lime Green Mist. If you want to buy some they are readily available from good nurseries. Google it for suppliers.

Thanks Pam!

Thank you all. I've never seen a green flower before.

Check out Hellebores then, Casso - Helleborus argutifolius has green flowers.