Triosteum aurantiacum E.P. Bicknell var. illinoense (Wiegand) E.J. Palmer & Steyermark. Illinois Horse-gentian. Phen: May-Jul; Aug-Oct. Hab: Woodlands and forests in circumneutral soils, particularly those over mafic or calcareous rocks. Dist: PA west to w. IA and se. NE, south to WV, c. KY, AR, and e. OK.
Origin/Endemic status: Native
Synonymy: = Ar, C, F, K1, K3, K4, Mo2; = Triosteum illinoense (Wiegand) Rydb. – Il; = Triosteum perfoliatum L. var. illinoense Wiegand – G; < Triosteum aurantiacum E.P.Bicknell – Mi, Pa, Backlund et al. (2002); < Triosteum perfoliatum L. var. aurantiacum (E.P.Bicknell) Wiegand – GrPl
Heliophily: 6
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