Astrophytum asterias. Sea urchin cactus. USDA 9-11. Hardy to 20° F . Full sun to part shade. Solitary globular cactus, up to 6" in diameter. Little water summer, no water in winter. Flowers are yellow with a red center. (CITI protected. Cannot ship out of USA).

Astrophytum asterias Gonzales. (Can't export this variety).

Astrophytum asterias v. nudum. (Can't export this variety).

Astrophytum capricorne. 

Astrophytum capricorne 'Stachellos' 

Astrophytum capricorne v. major.

Astrophytum capricorne v minor. USDA 9-10. Hardy to 20° F. Full sun to part shade. Solitary columnar or globose cactus, up to 4' tall, 4" in diameter. Moderate water in summer, little to no water in winter.  3" flowers are yellow with a red center. Origin: Northern Mexico.

Astrophytum capricorne var. crassispinum. Coahuila: 41 km W Cuatro Cienegas. Stem dark green to blue-green with or without scattered white flecks and with stout black spines.

Astrophytum crassispinoides. 

Astrophytum crassispinum. 

Astrophytum hybrids. Capricorne / myriostigma / ornatum / senile. All hybrid mix. 

Astrophytum myriostigma.  

 Astrophytum myriostigma 'Tricostatum Hybrids'

Astrophytum myriostigma Columnar

Astrophytum myriostigma CV Kikko (Japan, Onzuka)