Nick Maclaren wrote:
[...]
sometimes the common
"gardening" name is just plain wrong.

[...]
I can't think of examples of the third, but I am sure that there
are
plenty.

I can't stop my mother calling pelargoniums "geraniums", and a
village school-teacher once contradicted me when I correctly called a
geranium a "geranium". Both are better gardeners than I. And I refuse
to stop calling tropaeolums "nasturtiums". There's "ilex", too. Must
be hundreds of 'em.