Bundleflower leaves closed for the night

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Bundleflower leaves closed for the night
Desmanthus illinoensis
Prairie Mimosa
Friendship, IN
I think the thing I love about gardening/plants is puzzling out/identifying species. Over the years Ive added so many seeds/seedlings to the garden beds/seed bank that when something comes up it's always a little puzzle until it's old enough to have some diagnostic feature.
One such plant is this fabaceae, who could be any number of native peas I've planted (Senna, partridge pea, bundleflower, lupine, milkvetch, leadplant, ticktrefoil, baptisia, prairie clover are all in my garden in one way or another)
Every day I've been more and more confident it's a Chamaecrista fasciculata -- partridge pea, but I've been holding out that it's a Desmanthus illinoensis -- Illinois bundleflower that hasn't started doing it's smaller fractal leaves. But today I spotted this tiny ass who is definitely bundleflower.
How fun, I fricken love plants.