Astrophytum asterias

Sea Urchin Cactus
	; A. asterias cv.'Super Kabuto'
Scientific classification
Kingdom:	Plantae;
Division:	Magnoliophyta;
Class:	Magnoliopsida;
Order:	Caryophyllales;
Family:	Cactaceae;
Subfamily:	Cactoideae;
Tribe:	Cacteae;
Genus:	Astrophytum; Lem.
Species:	A. asterias; (Zucc.) Lem.
Binomial name
	Astrophytum asterias;

Astrophytum asterias is also classified as Echinocactus asterias. Common names used include Sea Urchin Cactus, Sand Dollar Cactus, and False Peyote.

Wikipedia has an article on Astrophytum.