These plants could be Exhibit A as examples of what is currently wrong with taxonomy of cacti today. Backeberg thought this was a natural hybrid between Echinocactus grusonii and a Trichocereus, which is a serious stretch considering those two species grow far apart on two continents. Then, someone decided to take it with Trichocereus formosa and lump them all into Echinopsis formosa. Huh? I think we'll use Backeberg's name. These plants are seedlings in 6-inch pots.