What trees have small round smooth speckled seeds?

Trees that produce small, round, smooth, speckled seeds include the black locust (Robinia pseudoacacia) and the sweetgum (Liquidambar styraciflua). The seeds of the black locust are typically found in elongated pods, while sweetgum seeds are encased in spiky, round capsules that can appear speckled. Other trees, like the catalpa (Catalpa spp.), also have similar seed characteristics. These seeds often serve as food for various wildlife.