Ludwig, Fulco, Rosenthal, David M, Johnston, Jill A, Kane, Nolan, Gross, Briana L, Lexer, Christian, Dudley, Susan A, Rieseberg, Loren H, and Donovan, Lisa A, Selection on Leaf Ecophysiological Traits in a Desert Hyrbrid Helianthus Species and Early-Generation Hybrids: .