These days we would call this a complex infographic, but it's powered by a simple list, which is "Plant species found at different climatic regions of the volcano."
If you look closely you'll see horizontal lines marking out four distinct bands:
- the jungle base
- the heavily vegetated midsection
- the thinly vegetated area above the tree line, and finally
- the bare and snowy summit.
Each of these is a list category, and the species are items.
Obviously there's more to it than that! If you put everything here in a simple text list without the illustration and layout, you'd lose as much information as if you took a map of a city and converted it into a list of place names. But the raw underlying data is still a list.
Arrangement?
The list is spatially arranged both horizontally and vertically.
This information would be hard to present in a vertical or horizontal list—you would need a matrix to do it well, and that's essentially what Von Humboldt has done: created a matrix with plant species as item, and vertical and horizontal position as properties.
Levels in the hierarchy?
At its simplest, you could say 2 levels: climatic band, then species within each band.
What are the list items?
Plant species.
How much detail?
The items themselves are just names, but each one inherits properties based on its position in the diagram, so you could say there's a lot of contextual detail.
