Washington Flora Checklist
A Checklist of the Vascular Plants of Washington State
Hosted by the University of Washington Herbarium


Checklist » Asteraceae » Matricaria discoidea

Matricaria discoidea DC. [FNA19]
pineapple weed

Origin: Native

Voucher: WTU (view specimen records)

Notes: FNA19: "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.

Matricaria matricarioides (Lessing) Porter cannot be applied to the American taxon; M. matricarioides was originally published as Artemisia matricarioides Lessing, a new name for Tanacetum pauciflorum Richardson (see S. Rauschert 1974), itself a synonym of T. huronense Nuttall. W. Greuter (pers. comm.), who accepts M. discodea, considers Rauschert’s treating Artemisia matricarioides as homotypic with T. pauciflorum as equivalent to a lectotype designation."


Photo © Ben Legler
(from WTU Image Collection)

Taxon treatment authored by Peter F. Zika; last updated 3/12/2013 by David Giblin
Chamomilla discoidea (de Candolle) J. Gay ex A. Braun
Chamomilla suaveolens (Pursh) Rydb.
Matricaria matricarioides (Less.) Porter nom. illeg.
Santolina suaveolens Pursh

© 2010 University of Washington Herbarium,
Burke Museum of Natural History and Culture.
All Rights Reserved.
Box 355325, University of Washington,
Seattle, WA 98195-5325.