Juncus interior Wiegand. Subgenus: Agathryon. Section: Steirochloa. Phen: Late Apr-Oct. Hab: Calcareous prairies, disturbed sites. Dist: OH west to SK, south to e. TN, AL (Sorrie & LeBlond 2008), MS (Sorrie & LeBlond 2008), LA, TX, and NM.
ID notes:Distinguished from J. anthelatus and J. tenuis by the shorter, rounded, scarious auricles. Distinguished from J. dudleyi by having brown drab auricles and distinguished from the very similar J. dichotomus by its lighter tan capsules. This is among the most difficult group of species to distinguish.
Origin/Endemic status: Native
Synonymy: = Ar, ETx1, F, FNA22, G, GrPl, Il, K4, NcTx, S, Tn, Tx, W, Kirschner (2002b), Kirschner (2002c); > Juncus interior Wiegand var. interior – K1, K3; < Juncus tenuis Willd. – GW1; < Juncus tenuis Willd. var. tenuis – C