Here in Queretaro, in the highlands of central Mexico, a fairly common barrel cactus about the size of a basketball with several sprouts at its base has begun blooming. They grow wild on thin soil atop metamorphic rhyolite and consolidated volcanic tuff. Using David Aquino's "Flora del Bajio" cactus treatment, the cactus keys out right to Stenocactus ochoterenanus. However, details in the description aren't quite right, and the flower color is a bit off. Especially the central spines are all wrong, and no images on the Internet seem to match. Attached are some photos so you can see what I mean. I look forward to some ideas.
