This variety originated as a hybrid of the Washington navel orange crossed with trifoliate orange pollen (hence is actually a citruvel) that was made by E. M. Savage, under the direction of W. T. Swingle of the U.S. Department of Agriculture, at Riverside, California, in 1909. In 1934, Swingle named it for A. M. Troyer, on whose place at Fairhope, Alabama, it was first fruited. Fruit small, oblate to spherical; smooth and nearly glabrous; color light orange. Rind medium-thick, with numerous oil glands; tightly adherent. Segments 9 to 10 and axis solid. Flesh color light yellow; juicy; flavor strongly acid and bitter. Seeds numerous, plump, and highly polyembryonic. Season of maturity early. Tree vigorous, upright-spreading, and medium-large with rather slender, thorny branchlets; foliage moderately dense, evergreen to semi-evergreen. Leaves dark green, medium in size, and mainly trifoliolate, occasionally unifoliolate. Productive and hardy.