Resource recommendations for plant distribution and ecology in the US

Hey all,

I’ve been scouring the web for resources to get overviews about plant abundance and range of different regions/ecozones.

There seems to be a lack of a series giving overviews of broad regions. My partner is a geologist and the Roadside Geology Series, and related books, make me envious of her field.

While keys are great, they don’t give you and understanding of the area. For example, at a glance in the Great Basin you'll most often see a handful of shrubs, while thousands of species occur in the area.

I’m taking a trip to the Grand Canyon and Canyonlands soon, and want to have an understanding before I visit. So if you know of a book that’s good for the southwest in general please leave a recommendation. Any other locations welcome though.

Any resources would be greatly appreciated! I'm sure what I'm looking for would be more ecologically focused, which is what I'm after anyways!

Thanks