In article , A. G. McDowell
writes
In the case of citrus, there is at least some chance that seedlings will
in fact be clones of the parents. While I can't find the reference I'd
like,

"The Pip Book", Mossman (1973, reprinted 1975, Published by Witherby).
If you plant one pip and get more than one seedling from it then the
extras are clones of the parent. It doesn't provide any way to tell
which is which, though. It reckons 6-8 years from pip to fruiting for
oranges, and an 18-inch pot.
--
A. G. McDowell