From the Rayones Valley to the Northern slopes of the Sierra Parras. In the direction of Rayones, the road was in good conditions for the first, until reaching Puente de Dios. Hovels stood sporadically, but it is rather surprising that anyone lives on these lands. The altitute is around 2000 m above the see level according to the GPS, but the plants of interest do not live at this altitude. The snow on the Northern slopes of the Cerro el Potosí was able to see even from far distance. Next to the road, there lives a Mammillaria winterae specimen with 15 cm in diameter. Nevertheless, no Aztekium ritterii specimens were found. Around 150 meters away from that place there was a valley consist of gypsum that showed a high similarity to the type locality of Aztekium hintonii and Geohintonia mexicana and that was plenty in Aztekium ritterii specimens. On a 2 m2 rock surface, around 85 specimens were able to be counted. In the close locality of Rayones, there are some Ariocarpus populations as well. Polish and Czech autors distinguish two forms of Ariocarpus scaphirostris: along the type form, they distinguish a wrinkled form with acute mammae that is called the “dry” form. Nevertheless these forms are not accepted as different by the canonized nomenclature. The Ariocarpus scaphirostris “dry” form was able to be found going to West in the direction of El Barreal. Close to Rayones, the type form of Ariocarpus scaphirostris was also found at the bottom of low, slate hills. Sadly, most of the population has been collected illegally before. Close to Hipólito, there is a population of Ariocarpus kotschoubeyanus var. macdowellii. The habitat at the given type locality was inadequate for them thus no Ariocarpus specimens were found, but farther on, there was a flat surface covered by rounded stones where a nice population, consist of small plants of 4–5 cm in diameter has been found. A further Ariocarpus kotschoubeyanus var. macdowellii population of 20–30, small (2–4 cm in diameter) specimens was found going to the North. In the direction of Viesca, István Varga found a single, young Ariocarpus fissuratus var. lloydii around 30 m from the road. A bit further on, few dead specimens and signs of an illegal collection in the past: holes in the soil were found. Fortunately, a few living specimens, among others a very large, three-head Ariocarpus fissuratus var. lloydii specimen was found at the locality.
