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W ater primrose

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W ater primrose

(Ludwigia spp.) Order

Family Genus Species

Classification

A m ph ib io us p la nt s

2 1

3

© Alain Dutartre

4

© Alain Dutartre

5

© Alain Dutartre© Alain Dutartre© Emilie Mazaubert

© Alain Dutartre

54

1. Creeping water primrose (Ludwigia peploides).

2. Large-flower water primrose (Ludwigia grandiflora).

3. The pond colonised by water primrose in the Var department.

4. Root system.

5. Sprouting water primrose.

Myrtales Onagraceae

Ludwigia L. peploides ((Kunth) P.H.Raven, 1963)

L. grandiflora ((Michx.) Greuter et Burdet, 1987)

Originated in South America. Accidentally introduced in Languedoc around 1830. Later used as an ornamental plant in outdoor basins.

D escriptif

n Amphibious plant, rooted

n Rigid stalk with nodes, easily breakable

n Yellow flowers, separate petals (L. peploides) or overlapping petals (L. grandiflora)

n Brace roots and aeriferous roots

n Fruit in the form of capsules

E cology and reproduction

n High adaptation (long stalks along the surface, branches) and colonisation capabilities (complete occupation of the available space, growth above the water level)

n Very resistant plant (strong root system)

n Production of large quantities of biomass, layer of plant litter on some sites

n Sexual reproduction is possible

n Wide range of favourable biotopes:

- shallow wetlands - edges of ponds and lakes - channels, ditches, side channels

- rivers with low discharges during the summer - wet meadows

D ocumentation

n Lambert E. 2009. Plantes exotiques envahissantes - Synthèse bibliographique. CEREA/UCO/Angers-GIS « Macrophytes des eaux continentales » - Comité des Pays de la Loire/Gestion des plantes exotiques envahissantes – 2èed. complétée, 110 pp.

n Hudin S., Vahrameev P. (coord.) 2010. Guide d’identification des plantes exotiques envahissant les milieux aquatiques et les berges du bassin Loire-Bretagne. Fédération des conservatoires d’espaces

naturels, 45 pp.

Author: Emilie Mazaubert, Irstea

Références

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