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If you were doing this normally, you would ssh to your remote machine with ssh -X to enable X forwarding, and then any graphical programs that run remotely would be displayed locally.
Since roslaunch is running ssh for you as part of the launch process, you'll need to find a way to pass the -X flag to the ssh client. There don't appear to be any command-line arguments to roslaunch that do this.
It looks like you can edit your ~/.ssh/config to include the ForwardX11 option to automatically turn on X forwarding. See: http://linux.die.net/man/5/ssh_config
A section like this in your SSH config should turn it on for only the remote host you're interested in:
Host lili-pc.local
ForwardX11 yes
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