Northern Prairie Wildlife Research Center
Southern Wetland Flora
Field Office Guide to Plant Species
Ludwigia repens J. Forst.
- Family: Evening Primrose (Onagraceae)
- Flowering: July-September
- Field Marks: This creeping herb has small, yellow, 4-parted, axillary flowers. It differs from
very similar marsh purslane (Ludwigia palustris) by having petals and by lacking vertical green
stripes on the capsule.
- Habitat: Wet ground in ditches, along streams, around ponds, swamps, shallow spring water.
- Habit: Perennial herb, rooting at the nodes, often forming mats.
- Stems: Creeping, smooth or rarely hairy, up to 3 feet long.
- Leaves: Opposite, simple, spatulate to elliptic to nearly spherical, pointed or rounded at the tip,
tapering to the base, without teeth, smooth, up to 2 inches long, up to nearly 1 inch wide, with
or without stalks.
- Flowers: Solitary in the axils of the leaves, stalkless or with a very short stalk.
- Sepals: 4, green, ovate to triangular, up to 1/8 inch long.
- Petals: 4, yellow, up to 1/4 inch long, failing off soon after formed.
- Stamens: 4.
- Pistils: Ovary inferior.
- Fruits: Capsules 4-sided, green, smooth, longer than broad, up to 1/4 inch long, lacking vertical
green stripes, containing many minute seeds.
- Notes: The stems are eaten by muskrats. This species, when growing in water, usually develops
flaccid leaves and stems.
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