Cubelium concolor (T.F. Forster) Rafinesque ex Britton & A. Brown. Phen: Cleistogamous flowers: Apr-early May; late May-Jul. Chasmogamous flowers: Late May-Jun; May-Oct. Hab: Very nutrient-rich and mesic forests, especially over calcareous substrates such as limestone and dolomite, sometimes extending upslope into dry-mesic or even dry forests and woodlands when the soils are very basic. Dist: VT and s. ON west to MI and KS, south to SC, GA, Panhandle FL, s. AL, ne. MS, and AR.
Origin/Endemic status: Native
Synonymy: = K4, S, Ballard () (in prep), Ballard, Kartesz, & Nishino (2023); = Hybanthus concolor (T.F.Forst.) Spreng. – Ar, C, F, Fl2, FNA6, G, GrPl, Il, K1, K3, Mi, NE, NY, Pa, RAB, Tn, Va, W, WH3, WV, McKinney & Russell (2002)