Matricaria discoidea

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Matricaria discoidea has been used as a medicinal and aromatic plant by Native

       American tribes (D. E. Moerman 1998). It also is considered a weed, and it is resistant to a
       photosystem II inhibitor herbicide in the United Kingdom (www.weedscience.org). It is a
       northwestern North American native that has spread to eastern and northern North America and
       elsewhere (E. McClintock 1993b; E. G. Voss 1972–1996, vol. 3; A. Cronquist 1994).
       NatureServe (www.natureserve.org) and Natural Resources Conservation Service
       (plants.usda.gov) erroneously present M. discoidea as introduced on the continent. Its
       natural habitat is ill-defined because the species has become ruderal even in its native
       range. For discussion of the nomenclature of this taxon, see S. Rauschert (1974); K. N.
       Gandhi and R. D. Thomas (1991); Cronquist; and Voss.