Keys to Angiosperms by Trees Are Key published on 2019-12-18T22:32:22Z Trees Are Key We recently discussed the Keys to Gymnosperms and now it’s time to talk about the rest of our trees… angiosperms. They are a more recent evolution and have been very successful. You can divide angiosperms into monocots, like corn, grasses, and palms, and dicots, our woody trees. Species Spotlight The Anacua Ehretia anacua is also known as Knockaway, a Sandpaper-Tree. This tardily deciduous Texas native is tough. It is a medium-sized tree to 50 feet tall with a dense, round crown of dark green foliage. Our four national co-champions are almost 4 feet in diameter.