Spotting

It's in my garden

I agree it looks most like Nepenthes. Was it growing wild or in a garden?

I agree, they are pitcher plants... but that's a whole big group of plants! This one I've seen kept sold as an exotic house plants. I've also seen them in green houses at botanical gardens. I don't know the exact species, but it is not of the genus Sarracenia or Heliamphora. It is possibly from the old world genus of Nepenthes.

They look like "Pitcher plants" to me.