To my surprise, I fund this very nice caudiciform collection in a backyard in Diego.
Unfortunately, the owner was out in the bush, but I made some photos in 2006.

Adenia firingalavensis v.stylosa

Adenia firingalavensis v.stylosa

Cyphostemma macrocarpa.

Adenia firingalavensis v.stylosa

Adenia firingalavensis v.stylosa

Pachypodium decaryi?

Crinum species.