Astrophytum myriostigma var. quadricostatum
Astrophytum myriostigma subs. quadricostatum
Astrophytum myriostigma var. quadricostatum-pubesente
Astrophytum quadratum
Echinocactus myriostigma subs. quadricostatus
Echinocactus myriostigma var. quadricostatus
Echinocactus myriostigma var. quadricostatus

Astrophytum myriostigma quadricostatum is a nursery produced cultivar.

A. myriostigma quadricostatum grows a quadrangular to spherical stem, characterised by the presence of four ribs instead of five. Aging, the plant can get almost columnar-shaped, getting up to 90 cm tall. After 6 years of live, this Astrophytum may bloom in warm seasons, with pale-yellow, silk-shining flowers arising on the stem top, from the areole.

This Astrophytum is a quite slow-growing cultivar. It needs a mineral, well-draining substratum, and a good amount of sunlight; you can water it once a week, and during sunny and warm weather you can add a little fertilizer. Theoretically, A. myriostigma quadricostatum is tolerant to freezing temperatures (-4°C / -10°C); however, if put in a greenhouse, it will grow easily (even if slowly) and healthy.

Even if you can find this Astrophytum grafted on other cacti, usually propagation is done by seeds.

This plant was been described for the first time in 1841.