Plant based lifeforms: brain equivalent?

In lots of science fiction works that visit other planets we are often introduced to intelligent plant based lifeforms, be they humanoid looking or potted plant looking.

I'm curious as to what part of the plant has to evolve to gain sapient or near sapient intelligence. Eg, all mammals share an organ known as the brain and central nervous system. What would be the plant based equivalent?

I want to have some plant based organisms but need to figure out what part of the plant is essential to keep and develop. I don't want to accidentally make the most likely area into a vestigial feature (I'm not looking for full sapience but if you can figure that out, I'm sure such an answer would be useful to others)

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Plant based lifeforms: brain equivalent?

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