Water Primrose

Ludwigia peploides

water_primrose_02-02-14.jpg

Photo of water primrose plant showing typical roots, leaves, stems, and a flower
Graves Lovell, Alabama Department of Conservation and Natural Resources, Bugwood.org
Family

Onagraceae (evening primroses)

Description

A common shoreline plant with bright yellow flowers usually having 5 petals. Blooms May–October. Stems long, trailing, creeping out across the water’s surface, can reroot from cuttings. Leaves shiny, dark green, alternate, variously shaped from oval to narrow and willowlike. Roots are of two types: typical roots that grow downward and take nutrients from the soil, and “air roots” or “breathing roots” that are white, spongy, grow upward, and float—these apparently absorb gases from the air.

Similar species: There are 11 species of Ludwigia in Missouri, which all have 4 petals or, lacking petals, 4 sepals (not 5).

Habitat and conservation

Grows in dense mats in the shallow areas of ponds, lakes, and streams.

image of Water Primrose distribution map
Distribution in Missouri

Statewide.

Human connections

When this species grows too rampantly in fishing ponds and waterways, it can become a nuisance and require control. People have introduced this plant all over the world, where it can become a noxious weed.

Ecosystem connections

Colonies of aquatic plants are important nurseries for fish and other aquatic life, providing sustenance and shelter and for the small creatures at the base of aquatic food chains.