Squash that don't Cross!

Rambicante (Tomboncino) and Cushaw Squash don't cross with other varieties.  Caleb Warnock plants both of these squashes each year in his garden because he doesn't have to hand pollenate them.  Rambicante is a vining squash that you can eat as a summer squash like you would zucchini, or you can leave it on the vine to harden and store as a winter squash that I hear tastes kind of like Butternut Squash.