Uruguay Water-primrose, Ludwigia grandiflora

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Short description of Ludwigia grandiflora, Uruguay Water-primrose

A creeping perennial water plant with long oval leaves like a willow and a large, bright yellow flower like that of a primrose. It can be distinguished from L. peploides by differences in chrmosome number and morphology, most notably the dull, cuneate leaves, pointed stipules, larger sepals (> 10 mm), and presence of pneumatophores (Armitage et al., 2013).

Description of Ludwigia grandiflora, Uruguay Water-primrose status in GB

An invasive species in northern Europe (especially France) which has the potential to become invasive Britain in the future. Since it was first discovered in 1998 it has been recorded from approximately 25 sites, including a SSSI in Hampshire where it threatens populations of rare species such as brown galingale Cyperus fuscus. There has been confusion between L. grandiflora and L. peploides in Britain in the past but L. grandiflora is now known to be the only taxon that has escaped into the in the UK (Armitage et al., 2013).

Habitat summary: Ludwigia grandiflora, Uruguay Water-primrose

Ponds, farm reservoirs and slow-flowing rivers and ditches. Most populations are in ornamental ponds where it is likely to have been planted (e.g. ornamental ponds in large gardens, on golf courses, etc.).

Overview table

Environment: Freshwater
Species status: Non-Native
Native range: Bolivia, Colombia, Costa Rica, Ecuador, Guatemala, Peru, Paraguay, Uruguay, Argentina, Chile, Southern Brazil
Functional type: Land plant
Status in England: Non-Native
Status in Scotland: Non-Native
Status in Wales: Non-Native
Location of first record: v.c.11 (Barton Golf Course)
Date of first record: 1999

Distribution map

GB Distribution from BSBI

Author's name:

Kevin Walker

Last updated:

September 8th 2017

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