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Marsh Yellow-Cress

Marsh Yellow-Cress

Rorippa palustris

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How common: Common

Marsh Yellow-Cress is a small, upright mustard-family plant of wet, muddy places. It is usually annual and often appears where soil has been disturbed and stays damp. The flowers are tiny and pale yellow, followed by many narrow pods.

Did you know?

  • It often pops up quickly on newly sown lawns and muddy ground after rain.
  • Its first leaves form a flat circle at the base that withers when the stem shoots up.

About the species

Identification

An upright, mostly annual plant 10–60 cm tall. It starts with a flat circle of deeply lobed leaves with rounded lobes; these wither once the stem grows. The stem branches above. Stem leaves are also lobed and clearly toothed, and they wrap around the stem with small ear-like lobes at the base. Tiny pale yellow, four-petalled flowers sit in leafless clusters at the shoot tips. After flowering, many narrow, slightly curved, plump pods on slender stalks stick out. Tell it from similar yellow-cresses by the very small petals and the round, not flat, pods. Flowers in Finland from June to August.

Plant group

Herbaceous plants

Habitat

yards and roadsides

Flowering

Jun–Aug

About the habitat

Grows on wet ground along water edges, in ditches, wet fields and meadows, and in damp disturbed places such as roadsides, yards, parks and newly sown lawns. Common in most of the country, rare in Fell Lapland.

Sources

Photo: Krzysztof Ziarnek, Kenraiz, CC BY-SA 4.0 https://commons.wikimedia.org/wiki/File:Rorippa palustris kz12.jpg

Text: Pinkka: Verso- ja leviäintunnistus - Kaikki versot, CC BY 4.0 https://laji.fi/taxon/MX.38395

Text: Pinkka: Pieni maatalouslajintuntemus - Puuvartiset, CC BY 4.0 https://laji.fi/taxon/MX.38395

Text: Pinkka: Verso- ja leviäintunnistus - Kaikki leviäimet, CC BY 4.0 https://laji.fi/taxon/MX.38395

Text: Pinkka: A Pohjolan kasveja - Rabelera-Ruta, CC BY 4.0 https://laji.fi/taxon/MX.38395

Text: Wikipedia (Finnish), CC BY-SA 4.0 https://fi.wikipedia.org/wiki/Rantanen%C3%A4tti

See also