The following includes nomenclatural transactions and commentary preliminary to a summary of the Leguminosae: Mimosoideae for the Vascular Flora of the Southeastern United States. Genera discussed are Albizia, Leucaena and Schrankia. New combinations include: Schrankia microphylla (Dryander) Macbride var. floridana (Chapman) Isely, and Schrankia nuttallii (DC. ex Britt. & Rose) Standl. var. hystricina (Small ex Britt. & Rose) Isely.