There is a coll. of C.W. Short (PH) from "summit of acid knob in barrens near Mammoth Cave" ca. 1840 that was initially labeled Agrostis trichopodes Ell., then annotated M. capillaris. FNA 25 seems to have mapped this coll. as M. expansa in EDMO, but the record remains dubious. M. expansa is virtually unknown outside of the Coastal Plain from se. Tex. to e. N.C. Moreover, capillaris does occasionally lack well-developed awns on lemmas, then resembling expansa, and these species can easily be confused, especially in immature specimens. [But see also Gymnopogon brevifolius (versus G. ambiguus), for a confirmed disjunction of similar nature.]