Opuntia engelmannii

Like Opuntia phaeacantha but with larger, rounder pads, generally taller, and with the petals entirely yellow rather than yellow with a red base. It also tends to be greener than either O. macrocentra or O. phaeacantha.

Plant habit on the road to Thomas Canyon, Baboquivari Mountains, 31 Dec 2008.

Plant habit at Aden Crater, 23 Feb 2008.

Plant habit, near Buehlman Canyon on the east side of the Santa Catalina Mountains, 31 Dec 2008.

Flowering pads on the road to Thomas Canyon, east side of the Baboquivari Mountains, 27 Apr 2008.

Closer view of a flower on the east side of the Baboquivari Mountains, 27 Apr 2008.

Areoles, east side of the Baboquivari Mountains, 27 Apr 2008.

A flower in Fillmore Canyon on the west side of the Organ Mountains, 17 Jun 2007.

Plant habit on the Jornada del Muerto near Mount Summerford, 25 Feb 2006.