Origin: as native seedling growing near the Nueces River, Zavala County, Texas, discovered in the 1920s by James A. Simpson, Uvalde, Texas. First propagated in 1928. Plant patent 73; issued 25 July 1932; assigned to Humble Oil & Refining Co., Houston, Texas. Nut: oblong elliptic, with obtuse apex and obtuse base; shell rough, heavily marked with dots; laterally compressed in cross section; 45 nuts/lb, 55% kernel; kernels rough textured, with medium dorsal grooves, deep secondary dorsal grooves, a deep ventral groove, and conspicuous secondary ventral grooves. Late to bloom. Many nuts (6-10) per cluster. Precocious and prolific. Ripens early. Tree: Fruit:
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