This interesting cactus is only found in one small area, on Cero Cantaro, at San Jose Lechuguiri, Oaxaca.
The plant is named after Francesco Ortega who first brought the plant to the famous botanist Tom MacDougall and subsequently named by Alexander in 1961.
There has been attempts to refer this plant to the Genus Coryphantha but due to its isolation it must have evolved from an early ancestor which branched into Coryphantha and
Ortegocactus. Philogenetic studies conducted in 2002 places this cactus between 
Coryphantha and the genus Neolloydia.I have seen this plant half buried in scree in its habitat. The area is quite inaccessible. I have had to take several lifts which took me half a day to arrive. It grows on limestone rocks. Habitat cacti can develop the same red marking as their counterparts in cultivation.
The plant is small but will eventually clump. Plants in cultivation are usually grafted but I have grown these plants on their own roots without any problem.
Top picture shows a plant in cultivation.
Middle picture shows the habitat of Ortegocactus.
Bottom picture shows a clump of Ortegocactus macdougallii in habitat. The ruler is 15cm long (6inches)
