Fact Sheets


Tripleurospermum maritimum (L.) W. D. J. Koch

Family :

Famille :


Synonym(s) :

Synonyme(s) :

Matricaria maritima

Common Name(s) :

Nom(s) commun(s) :

Seaside chamomile

  • Seaside chamomile (Tripleurospermum maritimum) achenes

  • Seaside chamomile (Tripleurospermum maritimum) achenes

  • Seaside chamomile (Tripleurospermum maritimum) achene, side with ribs

  • Seaside chamomile (Tripleurospermum maritimum) achene, side without ribs

  • Seaside chamomile (Tripleurospermum maritimum) achene, top-down view

  • Seaside chamomile (Tripleurospermum maritimum) achene, top-down view

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Regulation :

Remarques Réglementation:

  • Quarantine lists of countries e.g. Mexico *may be updated without notice

Regulation Notes:

On quarantine lists of countries e.g. Mexico*.

*Quarantine lists of countries may be updated without notice.

Distribution :

Répartition :

This species is native to Asia, Europe and North America (USDA-ARS 2017). In the United States, it is present in Alaska, California, Maine, Massachusetts and Pennsylvania (FNA, 2017).

Habitat and Crop Association :

Habitat et Cultures Associées :

This species grows in coastal areas, especially in rocky and poor soils. It is also reported from cultivated fields, old fields, roadsides and other disturbed areas, but these accounts may be based on mis-identifications (Darbyshire 2003; FNA 2017).

Economic Use, cultivation area, and Weed Association :

Utilisation économique, zone de culture et association de mauvaises herbes :

Duration of Life Cycle :

Durée du cycle vital:

Perennial, occasionally biennial

Dispersal Unit Type :

Type d’unité de dispersion :


General Information


Recent studies have questioned the identity of North American inland specimens from disturbed areas said to be seaside chamomile, as the species is known to be restricted to coastlines in its native habitat. These accounts often refer to the very similar species, scentless chamomile (Tripleurospermum inodorum) (FNA 2017).




  • Achene


    • Achene length: 2.8 – 4.5 mm (average 3.4 mm); width: 1.2 – 1.8 mm (average 1.5 mm)


    • Rectangular-shaped achene
    • Achene has two distinctive ends: one has a small style appendage surrounded by a jagged rim, while the other end has a small ring

    Surface Texture

    • Three longitudinal ribs are on one side of achene and no ribs on the other side
    • Achene surface is transversely wrinkled on the side without ribs; and reticulated with small interspaces over the side with ribs
    • Two oval-shaped resin glands are on the side without ribs near one end of the achene


    • Achene is medium brown, occasionally light brown; dark brown between the ribs
    • Resin glands are dark red or reddish-brown

    Other Features

    • Resin glands cannot be seen looking down from the end of the achene

Identification Tips


Additional Botany Information


Similar Species


Similar species are based on a study of seed morphology of various species, and those with similar dispersal units are identified. The study is limited by physical specimen and literature availability at the time of examination, and possibly impacted by the subjectivity of the authors based on their knowledge and experience. Providing similar species information for seed identification is to make users aware of similarities that could possibly result in misidentification.

Tripleurospermum inodorum (scentless chamomile)  

Scentless chamomile achenes are a similar brown colour, rectangular shape, and arrangement of ribs as seaside chamomile.
Scentless chamomile achenes are generally smaller (average length: 2.3 mm; average width: 1.1 mm) with ribs that are often a lighter brown with a wider space between them. The resin glands can be seen from the end of the achene and are usually round and red.

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Darbyshire, S. J. 2003. Inventory of Canadian Agricultural Weeds. Agriculture and Agri-Food Canada, Research Branch. Ottawa, ON.

Flora of North America (FNA) Editorial Committee, eds. 1993+. Flora of North America North of Mexico [Online]. 22+ vols. New York and Oxford. http://beta.floranorthamerica.org. Accessed April 25, 2017.

Flora of North America (FNA) Editorial Committee, eds. 1993+. Flora of North America North of Mexico [Online]. 22+ vols. New York and Oxford.  Accessed December 29, 2022.

Global Biodiversity Information Facility (GBIF) Secretariat. 2022. https://doi.org/10.15468/39omei Accessed via https://www.gbif.org/species/3104173 Accessed December 29, 2022.

U.S. Department of Agriculture-Agricultural Research Services (USDA-ARS). 2017. Germplasm Resources Information Network (GRIN), https://npgsweb.ars-grin.gov/gringlobal/taxon/taxonomysearch Accessed April 25, 2017.



Jennifer Neudorf, Angela Salzl, Ruojing Wang, Karen Castro, Katrina Entwistle

Canadian Food Inspection Agency