I wonder if anybody can tell me about this tree.
It looks generally like a Ficus benjamina, but the leaves are a little different and (key point) it is prone to putting down aerial roots which coalesce with the trunk, thereby expanding it.
It is because of that latter characteristic that I am considering using it to help stabilize a steep soil bank. Specifically, I'm hoping that by planting so that the trunk is laid back close to the slope, it will root into the slope in multiple places. In so doing, it should be less prone to leaning over as/if the slope gradually moves. The downside with this theory is that if the trunks become wall-like, they will channel the storm water straight down the slope, exacerbating gulleying. But the experiment is just on paper at the moment, so it can easily be changed.
Ficus microcarpa is my best guess.