What's the evolutionary advantage for warty squash? The new Seed Savers' Exchange seed catalog (for the public) is illustrated with many kinds and colors of gourds. Inside, they've combined gourds and squash (a quixotic decision, IMO, because I don't recall seeing any of the edible gourds among the offerings), and some of the squashes sport warts too. I've seen even wartier squash in some seed company catalogs. There must be an evolutionary advantage, or is evolution progressing from smooth to warty? Margaret L