Because they were never plowed under, pioneer cemeteries have functioned as an important refugia for prairie remnants. These small patches of habitat allow us to look back at what much of the midwest once looked like. They also harbor some of the rarest prairie plants that simply cannot survive in more disturbed habitats. As a tribute to these small nature preserves, Strange Bird blogger Sara Johnson and I set out on a mini tour of three cemetery prairie preserves here in central Illinois.