So if you graft...

Actually, most orange trees are grafted onto lemon root stocks, anyway...

More interestingly: Apparently, citrus is citrus is citrus. If you take an orange and plant it, you could end up with a lemon tree. If you take the lemon and plant it, you could end up with a grapefruit tree, and so on...

Check out "Oranges", John McPhee, ISBN 0141182032
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-- roger