The authors have recently collected Scleranthus annuus L., Myosotis discolor Pursh, Matelea cynanchoides (Engelm.) Woods., and Thelesperma filifolium (Hook.) Gray new to Louisiana. Myosotis discolor was collected in Claiborne Parish, and the other three species were found in Caddo Parish in extreme northwest Louisiana. None of these species are included in the recent checklist of Louisiana dicotyledons (Thomas and Allen 1982).