Pelecyphora hesteri Neotype: United States of America, Hill on U.S. 385, 3.5 miles south of U.S. 90 east of Marathon. South side of gap and road cut. Crest of hill. Drainage Area Rio Grande, 6 Apr 1965, L. D. Benson & B. H. Warnock 16500 (POM: 315706)