It is possible that you have a plant started from a rooted cutting. lemons are very easy o root.

any one have any pictures of graft lines so i can compare with my tree it is supposed to be a dwarf meyer im not even sure if its a meyer they leaves are varigated it was sold as a dwarf meyer

Gmb, is there one trunk or several? If several, there's a good chance it's seedlings as Peacanman said.
Sorry, I'm still trying to figure out how to post pics, otherwise I'd go outside and snap a pic.
W/grafted trees you'll see a sideways line, and bump. This is where the graft, if there was one, took place..If you've got lemons I wouldn't prune off that branch. Toni

Toni, Peacanman did not say it was a seedling. What he said is that it was "possible that you have a plant started from a rooted cutting." If there is no graft line, which BTW is very easy to see, than it probably is a cutting. If your Meyer's trunk is straight up and down with no sideways bend at all (as Toni said) then it could easily be a cutting. IF it is a cutting then it would be a Meyer Lemon branch rather than a rootstock sucker. - Millet

Meyer Lemon is usually propagated on its own roots; however, it is still best to remove this, as a multi- trunked tree is not desirable.

Pardon me, a 'rooted cutting.' Toni

thanks and i think i found a graft line it is near the dirt and this branch is right at the graft i think ill let it be for now...i dont know how to send pics either and i do have two trunks one is curved and one straight up and they both look grafted... this trees leaves are varigated and really strong scented too i think it is a meyer the flowers are white it also has thorns doesnt look at all like the other dwarf meyer i have it is a cool lookin tree anyways

For myself I think multitrunk citrus tree is a novelty. I have not seen one YET. So if I have one like yours, I would keep it.
It could also be that when it was planted both are planted against one another. I was thinking to do this also.

gmb, does the sucker look anything like this (see link).

I have something similar on my dwarf meyer (strange unflowering thorny branch coming from lower trunk), and am debating on whether to cut it off.

Here is a link that might be useful:

Jon B 's picture shows a shoot of Poncirus trifoliata, a common (and for many situations, the best) rootstock for citrus.
Googling 'poncirus' will give lots of references.
The shoot should be removed, or it will eventually be stronger than the Meyers.

jon b my branch doesnt look like that it flowered and grew 4 lemons on it ... it is right at the graft line not really below it ... if i can figure out how to send a pic i will

Then it is a lemon branch. Keep it if you wish, or cut it if you desire a clean trunk. It's up to you. - Millet

please go to the following for pictures of graft line on a dwarf meyer lemon tree.

http://picasaweb.google.com/hazelelizondo/TreeGraftLine