Astrophytum Myriostigma cactus - Bishops cap

Bishop's Cap cactus, Bishop's Hat, Bishop's Miter, or Star Cactus, a species native to the highlands of northeastern and central Mexico. a star-like shape when viewed from above, resembling a bishop's miter.
The green stem is spineless and usually covered with a whitish flocking of tiny, hairy scales that can give it a chalk-white or silvery-gray appearance.
When mature, it produces large, glossy, funnel-shaped flowers, usually yellow to creamy white, sometimes with an orange or red center.