TY - JOUR T1 - A revision of Echinochloa in the United States JF - Amer. Midl. Natur Y1 - 1972 A1 - F.W. Gould A1 - M.A. Ali A1 - D.E. Fairbrothers SP - 36 EP - 59 VL - 87 IS - 1 ER -