Griffiths, Annual Report Missouri Botanical Garden 21: 171, 1910
Opuntia wootonii has been named variously. The plants are spreading and ascending to 2- or 3-ft tall. They are not prostrate though primary branches may rest on the ground. Cladodes are large, widest at the middle, and narrowed (or pointed) at both ends; their shape is distinctive. Alternately, cladodes may be obovate. Cladodes are 6- to 7-inches wide and 10- to 12-inches long on mature plants. The spines are 1/2- to 3- inches and may be longer on oldest growth. Areoles have 1 to 3(6) spines. The spines may be semi-erect, or mostly spreading outwards. Spines have light tips that quickly darken to reddish brown, chestnut, or even darker at the base. Typical O. wootonii specimens from south-central NM, or the greater El Paso, TX area are easily differentiated from other Opuntia by spine characteristics; they have chestnut-brown, long spines; they are handsome plants. However, more northerly representatives (eg, Belen) of this mostly NM species are less spiny. Read the original citation.
Dave Ferguson writes:
“It turns out that there are long-spined plants in the near-desert environments along the west bases of the Sacramento and Guadalupe Mountains (short-spined plants are much more abundant though). Long-spined plants also occur near the base of the San Andreas Mountains (both sides) and are on the east side of the Organ Mountains. There are also long-spined plants along the west side of the Manzano Mountains, but they are not as spectacular and the spines are duller and bit more brown.
“The species ranges from from Rio Rancho in Sandoval County, New Mexico to at least the Delaware Mts in Texas, and probably they are in the Sierra Juarez Mts too. In the Guadalupe, Sacramento, Organ, and Manzano Mts, the plants are quite common but mostly as the short-spined form at elevations above the deserts (and they may be confused with other species there). I don’t know if they are in Mexico, but I presume so. I expect they are abundant in some of the northern mountains of Mexico, particularly in Coahuila. I would expect them in the Sierra del Carmen but don’t know if they are there. They should be in most of the trans-Pecos Texas mountains, but I’ve not seen them in most areas yet. I would especially expect them in the Chisos and Davis Mts, but I actually need to go and see if they are really there.
“There are plants very similar to this species (long-spined, but duller spine colors) in the Florida Mountains near Deming New Mexico, and I’ve seen plants that may be the short-spined form on the south side of the White Mountains and along the Mogollon Rim in Arizona as far west as Prescott (but they could be something else, since I’ve not been able to grow any, nor see flowers or fruit yet).”