Thaspium chapmanii (Coulter & Rose) Small. Phen: Apr-Jun. Hab: Calcareous bluffs, dry to mesic forests and woodlands, especially over calcareous substrates, open disturbed sites. Dist: Sw. PA, s. ON, s. MI, sw. WI, and s. MN south to Panhandle FL (Jackson County) and e. TX (Houston County).

Origin/Endemic status: Native

Synonymy: = K3, K4, Mi, Tn, Floden (2019); = Thaspium barbinode (Michx.) Nutt. var. angustifolium Coult. & Rose – F; < Thaspium barbinode (Michx.) Nutt. – C, Fl7, G, GrPl, Il, K1, MC, Mo2, Ok, Pa, WH3, WV, Cooperrider (1985); > Thaspium barbinode (Michx.) Nutt. var. angustifolium Coult. & Rose – Coulter & Rose (1900); > Thaspium barbinode (Michx.) Nutt. var. chapmanii Coult. & Rose – Coulter & Rose (1900)

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