Dorstenia crispa var. lancifolia is in the Fig Family (Moraceae).
These grow thick branches – stout might be a better word for them. And these weird square blooms with explosive seeds – to propagate them you need to catch the seeds, or have a bunch of other pots nearby in your greenhouse that can catch them for you.
Now that’s an attractive rare succulent. Native to Somalia, which is not a safe place these days for plants to be native to.
To grow these as a houseplant requires regular water through the hot summer months, when they are full and leafy. A lot less water through the winter months when they go dormant and lose those serrated-edged leaves.