The message
from Kay Easton contains these words:

In article , Brian
writes

I would suspect that wrong names for the Gillyflower have only been
given when being questioned. This has been its name since Gaelic times and
is still in use.

I don't know how far back the usage of gillyflower for pink goes, but a
long time back. And it seems more common than its usage for wallflower.

Both Chaucer and Shakespeare refer to gillyflowers iirc. 18 months
after our move I still haven't unpacked the books (scream; bookshelf
maker promised for June)..so I can't look up the references to see which
palnt they meant :-)

Janet.