Dozens of varieties of leafy green (67 to be exact) are featured, each with a photograph for easy identification -- from popular ones like spinach, to the trendy such as kale and collards, to the obscure like mizuna or purslane, which may only be familiar to foragers, avid gardeners or world travelers. But the world is getting smaller every day and our grocery store selection larger, so it's probably just a matter of time before you see these at your local grocers.