In article , Rhiannon S
writes

I know this is probably a silly question, but... How can you tell which is the
true quince and which is the japanese one?

True quince is pear shaped and grows on a big tree. japanese quince is
small and round and grows on a low bush.
--
Kay Easton

Edward's earthworm page:
http://www.scarboro.demon.co.uk/edward/index.htm