In message , Jaques
d'Alltrades writes
No, it would be pure white - snow white. But with cut leaves like the
musk mallow - Malva moschata variant heterophylla. I'll sniff one next
time I see one and see if it is M. moschata.

Another alternative would be Malva alcea 'Alba'. There's also the hybrid
Malva x intermedia (alcea x moschata), and allegedly a hybrid Malva x
inodora (moschata x sylvestris).

At least some plants of Malva sylvestris are scented.

I don't know whether it's indigenous, feral or a cultivated plant. It's
not anything I've ever seen in a seed catalogue or a nursery.

--
Stewart Robert Hinsley
http://www.malvaceae.info/Genera/Malva/Bismalva.php
http://www.malvaceae.info/Genera/Malva/alba.php