I once met somebody who told me of a Citrus tree in Russia which was full of
grafts. The keepers of this tree had a policy of asking visitors to bring a
stick of their favourite Citrus tree: this was grafted onto the tree. The
trick was to get the tree to produce as many different Citrus fruits as
possible.

All commercial Citrusfruits are hybrids going back to three (four?) species
so they are quite compatible. I would say it is more than possible.
PvR


Iris Cohen schreef
I received the following from an author in New Zealand. Maybe some of you
can give a more definite answer.

From
I am a New Zealand novelist and my third novel is
about to be published. In it I refer to a graft hybrid citrus
tree created by one of my characters, an American
orange-grower of the 1890s. He creates a tree that
produces both oranges and lemons. I am very much
hoping you might be able to tell me whether, in theory,
this is possible!
Iris,