If you said: "Wild Cotton" (Gossypium thurberi), you're a winner.* Also acceptable are the names 'desert cotton' and 'Thurber's cotton'. All photos by Ned Harris from 5/25/11.
*I've had a few requests to make this a real contest, i.e., wait a day before revealing the answer and give out prizes. Because I don't like waiting for answers, you, dear readers, will have to settle for immediate gratification and desert knowledge as its own reward.