ID ideas, please

[jadegarden]

Hi,

Looking for suggestions on what these two are. I'm totally stumped - don't even have a fair idea of the genus. They are in 7 cm and 10 cm pots.

Thanks in advance!!

[Phil_SK]

They're both Parodia/Notocactus, the second being Parodia buiningii. Not sure of the first.

[rodsmith]

I agree about the second one, but the first looks like a cross between a Gymno and a Noto/Parodia - probably impossible.

[el48tel]

I have a Gymnocalycium buenkeri which is nearly, but not quite as lightly spined as #1, but certainly as similar in shape, and I have its provenance, which from Graham Charles, I trust.
I would agree that #2 is Notocactus/Parodia

[Tishania]

#1 looks very young to me and could change dramatically as it grows, my guess would be a Gymnocalycium or possibly even a Melocactus.
I agree that #2 is Notocactus buiningii (as I still think of it).

Both nice young plants.

[Stuart]

The first one looks to be a Gymno, something close to Horstii or a hybrid of Horstii, flowering will comnfirm. The second can only be Notocactus Buiningii.

Stuart

[jadegarden]

Many thanks for the suggestions. I see consensus on the second one.

I had tentatively labelled the first as a type of Gymno because that was my gut feeling, but it seemed like a stretch.

I have not had success with many types of Notocactus over the years, but I hope that this one will like me more than the others.

Will update my labels and see what happens as they mature.

Janine

[Detlev]

The first picture definitely does not show a Gymnocalycium, but a plant from the relationship of Parodia ottonis (Notoactus ottonis). Parodia ottonis sensu lato is a very variable species and many forms have been described as separate species. The plant shown corresponds to Parodia oxycostata (but which is classified by some authors only as a synonym of Parodia ottonis).
The plant looks very healthy. Enjoy the yellow flowers, which could appear next year already!
The ribs of Gymnocalycium horstii and G. buenekeri are more rounded and not as sharp as the ribs of your plant. Also both Gymnocalyciums have not so dark spines.

[ralphrmartin]

Detlev,

you have now jogged my memory. I have a plant labelled Notocactus acutus, which is similar to the plant shown, but with more sharply angled ribs and slightly longer / paler spines, and is now considered to be a form of Parodia oxycostatus.

Ralph

[Detlev]

Dear Ralph,
you are right, Notocactus acutus is classified as a synonym of P. oxycostata. JanD's plant is still young and "well fed", the angular ribs will certainly become more obvious later.
Detlev