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[Ginda Fisher <list@ginda.us>]

My potted meyers lemon has a sprout from below the graft.  It looks 
completely different:  the leaf is long and has three leaflets, and the 
stem has more, thinner spikes.

I plan to remove it, but I'm curious what it might be.  Any guesses?

The plant is hardy to about 20F, and the mature bark on the stock looks 
just like the mature bark on the lemon.
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Ginda
eastern mass. Zone 6