The Jatropha Plant is an oily weed, much oilier than corn, that will grow almost anywhere, and is a great source for biofuel. Here is a good article about it:
John Mathews, a professor of strategic management at Macquarie University in Australia, notes that many tropical developing countries have huge swaths of degraded and semiarid land that can be utilized for fuel crops. The cost of labor there is cheap, too. Biofuels made from plants such as jatropha, he argues, “represent the best bet for a last-ditch effort to industrialize the poor south and end poverty.” He advocates large-scale plantings to aid energy independence in expanding economies such as China and India and to boost exports in the less developed countries of Africa.