Echinocactus horizonthalonius Lem.

A small turbiniform cactus of low, rocky slopes found in southeastern Arizona & southern New Mexico. Seems particularly fond of limestone.

Plant habit near the northeast base of Bennett Mountain, San Andres Mountains, Doña Ana County, New Mexico, 9 Feb 2010.

Plant habit on Tortugas Mountain on the east side of Las Cruces, Doña Ana County, New Mexico, 24 Sep 2004.

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