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Although it may not be ideal for a large document, I have used the Coblis for individual figures that I'm worried about. I usually find small tweaks to the colors can make them much more readily differentiable in the simulator.

You don't need to do this. If properly pruned, crape myrtles will form a canopy over the sidewalk that doesn't interfere with pedestrians and actually provides shade; if topped like the picture, they will form an unruly mass of growth right at head height.

I agree, looks like a mulberry. Leaves on small trees and new branches are particularly likely to be lobed in mulberry, while older branches tend to produce leaves without lobes.