Coryphantha sneedii (Britton & Rose) A.Berger
A fairly common cactus on exposed limestone and, less frequently, rhyolite along the southern edge of New Mexico and in adjacent western Texas. The species has previously been split up into a several indistinct species, but I won't bother with these as they are obnoxious & not recognized in the Flora of North America.
Plant habit on limestone in Doña Ana County, 16 Oct 2005.
Plant habit on limestone in Doña Ana County, 11 Mar 2006.
Plant habit on rhyolite in Doña Ana County, 27 Jan 2008. This would formerly have been called Coryphantha organensis.
Plant habit, more former C. organensis on rhyolite in Doña Ana County, 11 Feb 2006.
Plant habit on limestone in Doña Ana County, 23 Apr 2010. This would formerly have been called Coryphantha sandbergii.
Closer view of flowers on the above plant, 23 Apr 2010.
More former Coryphantha sandbergii on limestone in Doña Ana County, 9 Feb 2010.
More former Coryphantha sandbergii on limestone in Doña Ana County, 9 Feb 2010.