Short Description
The amphibious yellowcress can grow up to 120 cm high.
The leaves are elongated and narrow. The margin is irregularly serrated. The lower leaves are often incised. The submerged leaves are comb-shaped.
The stem grows ascending, bare and branched. It often also has lying and rooting parts.
The flowers are clustered at the end of a grape-shaped flower head. They have four yellow petals.
The fruits are egg-shaped pods that open on both sides.
Features
Amphibious yellowcress
Rorippa amphibia
four yellow petals
elongated, serrated leaves
In the city
It is a pioneer on nutrient-rich, marshy soils that dry out at times. It grows on shallow banks and siltation areas of ponds, in ditches and in old water bodies.
Fun Facts
It reproduces both via seeds and via broken, rooted shoot pieces.
It can live permanently submerged in water. It then forms thick, hollow, tubular stems that allow it sufficient gas exchange.
The flowering period is from May to August.
It is a perennial plant. This means that a plant lives for several years, but flowers only once and dies after the seeds have ripened.
- Endangerment level Germany: not endangered
It is native to Germany. It is found throughout Europe and Asia.
Sources
Habitus, Fornax, CC BY-SA 3.0, https://commons.wikimedia.org/wiki/File:Rorippa_amphibia_eF.jpg
Blütenstand, Stefan.lefnaer, CC BY-SA 4.0, https://commons.wikimedia.org/wiki/File:Rorippa_amphibia_sl1.jpg
Habitus, TeunSpaans, CC BY-SA 3.0, https://commons.wikimedia.org/wiki/File:Rorippa_amphibia_plant.jpg
Kammer, P. M. (2016) Pflanzen einfach bestimmen. Schritt für Schritt einheimische Arten kennenlernen, Bern: Haupt Verlag.
Spohn, M., Golte-Bechtle, M. & Spohn, R. (2015) Was blüht denn da? Stuttgart: Franckh Kosmos Verlag.
Page „Wasser-Sumpfkresse“. : Wikipedia, The Free Encyclopedia. Date of last revision: 22.07.2017, 22:26 UTC. URL: https://de.wikipedia.org/w/index.php?title=Wasser-Sumpfkresse&oldid=167502641 (Accessed: 24.08.2018).