Steironema tonsum (Alph. Wood) E.P. Bicknell ex Britton. Phen: May-Jul; Aug-Oct. Hab: Moist to dry upland forests, especially over calcareous or mafic rocks. Dist: Sc. VA, sw. VA, and KY south to SC, wc. GA, and e. TN. The range is centered on the Southern Appalachians, but the species is essentially absent from the higher mountains – a "doughnut range".
Origin/Endemic status: Endemic
Synonymy: = S; = Lysimachia tonsa (Alph.Wood) Alph.Wood ex R.Knuth – C, F, FNA8, K1, K3, K4, RAB, Tn, Va, W, WV, Coffey & Jones (1980), Estes, Shaw, & Mausert-Mooney (2015); =? Steironema intermedium Kearney – G