An ecologist with a particular interest in the origins of foodstuffs, Nabhan interweaves ethnography, biochemistry, natural history and journalism to document traditional uses of 12 Sonoran desert plants: the creosote bush, palm, mescal, sandfood, organpipe cactus, amaranth, tepary bean, chile, devil's claw, panicgrass, and wild gourds.  (USW120, $19.95)