For Acacia
Isely, D. 1973. Leguminosae of the United States. I. Subfamily Mimosoideae. Memoirs N.Y. Bot. Gard. 25: 1-152.
Isely, D. 1998. Native and naturalized Leguminosae (Fabaceae) of the United States (exclusive of Alaska and Hawaii). Monte L. Bean Life Science Museum, Brigham Young Univ., Provo, UT.