This northeastern species was discovered by M. Medley in thin woods with Rhododendron maximum at Bad Branch in LETC. However, his coll. remains unaccessed or lost. There is also an unverified report from POWE or WOLF (J. Knouse, pers. comm.). It is also known in several adjacent counties of s. Ohio and w. Va. (PL). Across its range, matricariaefolium (2n = 180) occurs in a wide range of habitats, like lanceolatum (2n = 90) but perhaps concentrated on less fertile soils. Although concentrated in shade, the plants may respond to soil disturbance or fire (Rock 2000). These are the only Ky. species that are retained in Botrychium, sensu stricto, after the recent revision of Hauk et al. (2003). Another northern diploid may also be expected: B. simplex E. Hitchc. (PL).