Given the way they’re describing it, US south/southeast. The pitcher plants that grow there grow in marshes and swampy grasslands are from there. Pitcher plants elsewhere in the world are a different type all together, and are generally epiphytes or close to it.

Except Australia and certain south American highlands. Or the pacific northest US. There are like 4 families of pitcher plants, only two of which are closely related (counting sarracenia and darlingtonia together with heliamphora in the family and nepenthes and cephalotus on their own).

NW Florida. Not legal to grab them, but I’ve moved some to my swampy camp in the boondocks. Growing some in a buried trashcan pond, getting seeds to spread around.