Same genus/Different Kingdoms

[Davis, Peter ext. 3232]

I noticed recently the apparent duplication of a genus name for both an
insect and a plant.  The genus name is Pieris.  In the Insecta, this genus
appears in the Order Lepidoptera and Family Pieridae.  The best known example
of the genus is Pieris rapae (Linnaeus), the cabbage white butterfly.  The
genus name Pieris also appears in several books for a plant belonging to
the Family Ericaceae.
I am not a taxonomist but I would like comments on this apparent duplication
and what significance it has from people on the list who are knowledgeable in
these matters.

Thanks   Peter Davis