Coryphantha werdermannii PP200 Hundido, Coah. Mx.
After a youth-stage of 7 to 12 years, with purely smooth radial spination suddenly strong central spines appear on the top, which finally cover the whole body and which are responsible for the wild look.
 

Description: Dwarf cacti with juvenile globose body with became ovoidal as they age.
Stem: To 8 (-30) cm tall, diameter about 6 cm.; Epidermis grey-green. Woolly at the apex.
Areoles: Elliptical with e wool.
Spines: Centrals 2-4 clear brown (only in mature specimens); radials 15-20 ( o more depending on plant’s age) e.
Flowers:  Quite large yellow 5-7 cm in diameter on mature specimen
Roots: Very fine fibrous that extend just a few millimeters below the ground  surface, probably they also serve the absorption of dew in this region poor of precipitations.

Cultivation: Somewhat sensitive to overwatering (rot prone) and very slow-growing.
Grow in a  mineral  cactus compost, requires good drainage. Water in moderation, keep drier in winter. Full sun to partial shade. Provide very good ventilation.

Scientific name:  Coryphantha werdermannii Bödeker 1932
Published in: Monatsschr. Deutsch. Kakteen-Ges. 1:155. 1929

Origin:  The species is a regional endemic of Sierra Paila, Coahuila. Reported from south of Cuatro Cienegas, near the road to San Pedro de las Colonias in Coahuila over ca. 80 km along the road in a depth of many kilometres.

Conservation status: Listed in CITES appendix 1.

Habitat: This is the only Coryphantha included in app. I of CITES. In nature it is not endangered at all (a very conservative estimate comes already to ca. 200'000 individuals on the gentle slopes north of the Sierra de Paila) The species grows in 3 different habitat types: Alluvial plain, gravely bajada and limestone rocks. Highest population densities are observed on bajadas. These habitats are in extremely dry regions.

Coryphantha werdermannii PP200
A ten years old seedling but with still juvenile spination.