There is a common weed in Georgia that looks like a very young mimosa. I don’t remember its name, but I know I wouldn’t be able to tell them apart until either the weed develops into something that’s clearly a weed, or the mimosa grows a woody stem and persists.
I must defer to stone’s expertise (and thanks, stone). Are there other mimosa-mimickers in the small weed category? Because, actually, none of the above seems to quite fit the small, weedy plant growing in profusion, that I believe I sucessfully ID’d a couple of years ago.
Stone, thanks very much for the info. I viewed your photos and believe my weed matches your Sesbania herbacea, what we used to call coffee weed or coffee bean. I didn”t recognize it without the yellow flowers. Will keep watching it for a while longer. Glad to know butterflies will love it!
Actually… Coffee weed is a different plant.
Check this post about the cloudless sulfur butterfly laying eggs on coffee weed and partridge pea.
You should check the link as well. The partridge pea is a very desirable wildflower that has similar leaves to the chamber bitter weed…
Coffee weed, partridge pea and Sesbania all have leaves that fold up at night… Very cool… They all improve the soil by adding nitrogen, and the flowers and caterpillars are total bonus!