Stuck with a growing pop of a species that is no longer present on the planet
If a planet is allowed to go into starvation, any growing pops instead gain a negative growth modifier. When their total growth hits zero, the potential pop will disappear.
The easiest way to get starvation quickly is to disable all your food production buildings, but be aware that starvation is only calculated on a new month.
You will get a -65% happiness modifier while your pops are in starvation mode, and that will also not go away until a new month rolls over.
Apparently this bug is still present as of 1.1. If you're not concerned about achievements, you can use console to kill it:
open console with
~
type
debugtooltip
to enable additional info on tooltipsfind ID of the pop by hovering mouse over it, should be at the bottom of the popup
type
kill_pop <ID>
into console