Only the third one is a Rebutia. The others are Aylosteras. It is easy to see why they were cons=fused before DNA sorted them out.

Herts Mike wrote: ↑Sat May 11, 2024 12:32 pm Excellent picture! One of the first succulents I ever grew.

Me too!

I now have both Oscularia deltoides v. deltoides and v. caulescens (less toothy). Both have put out a good show of flowers in the last couple of weeks.

This may be relevant

Field number: BLMT 238.01
Collector: Brian Francis Bates, Martin Lowry, Timothy (Tim) David Marshall, Tomlinson
Species: Sulcorebutia canigueralii
Locality: Sucre n, Oropeza, Chuquisaca, Bolivia
Altitude: 3070m
Date: 1998/10/7
Notes:

Ah, Colin the Composter has a protogé...

SimonT wrote: ↑Thu May 09, 2024 5:55 pm The flowers from the plant on the left looks like the flowers on the named parent?

Yes, although the colours on the parent are more striking...

I collected some seeds off my Chamaecereus 'Rugens Abendsonne" (other parent random), and got various seedlings up as result. The first two have now flowered. Nice enough, but no real wow factor...

Thanks, Detlev, and also thanks for bringing me up to date on a few of the finer points!

Detlev's talk on Cactus seeds in colour was fascinating...

That's a nicely spined plant; good flower too.

Nice plant!

The way to tell the genera apart is:

Rebutia: Flower tube and fruit smooth, or at most finely hairy
Aylostera: Flower tube hairy and bristly