F. simplex is a rhizomatous perennial of base-rich soils in south-central states. Var. aristulata is a distinct taxon that usually occurs on shores; var. simplex usually occurs on seepy uplands (FNA 23, Y). The only Ky. records are colls. during 1984 from FULT in the "lower sandy drainage pattern of Fish Lake" (R. Athey # 4937 & 4974 at EKY).