Alluaudia montagnacii (Cultivated- USA)

Alluaudia montagnacii Rauh, Adansonia n.s., 1: 43 1961. ;

Madagascar (Itampolo) as per WCSP;

https://groups.google.com/group/indiantreepix/attach/16dae43493596/Desert%20House,Conservatory,Atlanta%20Botanical%20Garden,Atlanta-IMG_20181021_175703304.jpg?part=0.1&authuser=0&view=1
 
Alluaudia Species : Atlanta Botanical Garden : Atlanta : 20JUN20 : AK-27 : 4 posts by 2 authors. Attachments (1)- 219 kb.
Seen in the garden during my visit in October, 2018.
This was in their Conservatory, in the Desert House.
Looks close to Alluaudia montagnacii, of Didiereaceae to me.
Details are not clear in this small image.
Is it listed over there on their site ?
May be superficially as per
https://groups.google.com/group/indiantreepix/attach/321ece23c1eb8/Alluaudia-Desert%20House,Conservatory,Atlanta%20Botanical%20Garden,Atlanta-IMG_20181021_175703304.jpg?part=0.1&authuser=0&view=1
 
Thanks for the links.
I have not come across any official site of the botanical garden.
My suggested id was based after searching.
Adding the original image if it helps.
Attachments (1)- 6 mb. 

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