Etymology -The genus and species combination commemorates two Mexican politicians - Alvaro Obregon and Senor Denegri, respectively President and Minister of Agriculture at the time the plants were discovered in 1923 by Alfred Frec.
Obregonia is one of the highly sought after cactus from Northern Mexico which are not found in mass-production at large commercial nurseries, but are readily available through specialty cactus nurseries.
The genus is comprised of a single species which is unique in appearance to that of other cactus species and therefore instantly recognizeable. Stems are solitary flattened globose shaped with triangular tubercles. The tubercles are arranged in a spiral and give the plant an appearance similar to an artichoke. Areoles are small at the tips of the tubercles and weakly defended by 3 or 4 small spines. Flowers are funnel-shaped, white with yellow stamens and come from the top-center of the plant.
Cultivation Notes: Many growers -especially in lower latitudes - have found that this species does not do well in full sun. Full morning sun with afternoon shade seems to be produce the best growth. Those in cooler climates without as much sun such as England or Washington state my do well with this plant with no shade cover due to the lower intensity of the sun and frequencey of clouds. However, plants in a hothouse (greenhouse) would still be better off behind a taller plant or on a lower partially shaded shelf.
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