That's an interesting chalk-like style.
It's unusual for something so large to have a shape like that. I did some research on tree ferns and cycads, which are sort of similar. Exceptionally tall cycads seem to reach 20 m, and this is twice that size. Could you liken it to a real plant with a similar shape in its description?
With all these super-large flora, I'm tempted to make a (long-delayed) batch of flora extra-small just to be contrarian.