Balloon Cactus, Magnificus, Parodia magnifica queen_of_the_night terscheckii produces white blooms which

terscheckii  produces white blooms which are three inches long

but impenetrable

so avoid injury from them as well

and have eight to 18 ribs

But grafted to the top will be a crest from a different plant

Balloon Cactus, Magnificus, Parodia magnifica queen_of_the_night terscheckii produces white blooms whichParodia magnifica is a species of flowering plant in the cactus family Cactaceae, native to southern Brazil. One of several species called ball cactus, it grows to 715 cm (36 in) tall by 45 cm (18 in) broad, with heavily ribbed, spherical to columnar, spiny and hairy stems, bearing pale yellow flowers in summer. Its natural habitat is cool, dry temperate grassland at elevations of up to 800 m (2,600 ft). Populations are sparse and fragmented, and it