When I was young, my mother had a shrub in her yard that I have not been able to find anywhere, especially since I don't know its name. It was destroyed many years ago, so I will describe it.
It was a small compact shrub, about 2 feet tall and 2 or 3 feet across. It grew in a perfect mound shape, with the thin branches sort of weeping to form the tight mound. The branches reminded me of the branches of scotch broom, but the shape was nothing like scotch broom. The blooms reminded me of forsythia blooms or carolina jessamine blooms, and it bloomed about the same time as those (early spring). Still, it didn't have the shape of either. It was really pretty with its short ball-shaped mound.
This plant was planted by my mother in the 1940s if that helps. If anyone knows what this might be, please let me know or tell me a website where I might find one for sale.