Thalictrum macrostylum Small & A. Heller. Section: Leucocoma. Phen: May-Aug. Hab: Moist places, perhaps associated with circumneutral soils, moist to dry ultramafic outcrop barrens (over serpentinized olivine), tidal freshwater marshes, rarely pineland seepages with calcareous substrate. Dist: Se. VA south and west through NC, SC, sc. GA, FL, and AL to MS.
Origin/Endemic status: Endemic
Taxonomy Comments: Under taxonomic study by D.B. Poindexter and A.S. Weakley.
Synonymy: = C, F, Fl2, FNA3, G, GW2, K1, K3, K4, S, Va, WH3, Park (1992); > Thalictrum macrostylum Small & A.Heller – RAB; > Thalictrum subrotundum B.Boivin – RAB