SCHLUMBERGERA STAR BURST
Photo taken on 28/11/2019
Seen from this angle, the flower, like all other full bloomers,
is clearly zygomorphic.
S. Star Burst is probably a mutation of unknown origin of a Schlumbergera.
I don't believe too much in the hypothesis of an intergeneric cross
between a Hatiora and a Schlumbergera (x Hatbergera)
because there is only one documented one and it was obtained not without difficulty.
(See link at the end of the update)