Mini Cactus Redux

Its flower fully sprouted overnight! And there are a few more buds growing as well. I discovered that my cactus is not naturally-occuring: it's a hybrid species of Echinopsis chamaecereus, named "Pauline." Up until the 1970s and 1980s Chamaecereus was a separate genus, but new taxonomical research grouped them together.
I am particularly happy with this purchase because the genus is native only to South America, where it grows on the hills and rock crevices of Argentina, Chile, Bolivia, Peru, Ecuador, Brazil, Paraguay, and Uruguay.

