Northern Prairie Wildlife Research Center
Southern Wetland Flora
Field Office Guide to Plant Species
Ludwigia peploides (HBK.) Raven
- Family: Evening Primrose (Onagraceae)
- Flowering: May-September
- Field Marks: This species is readily recognized by its 5 large yellow petals, 10 stamens,
ovary, and long-stalked, alternate leaves.
- Habitat: Shallow ponds, ditches, lakes, pools, streams, canals, usually in shallow water.
- Habit: Perennial herb with floating or creeping stems that root at the nodes, often forming mats
in shallow water.
- Stems: Creeping or floating, smooth or slightly hairy, up to 3 feet long.
- Leaves: Alternate, simple, oval to obovate to elliptic, rounded or pointed at the tip, narrowed
to the base, up to 4 inches long, up to 1 3/4 inches wide, without teeth, smooth or less commonly
sparsely hairy on the lower surface; leaf stalks often as long as the blade.
- Flowers: Solitary in the axils of the upper leaves, up to 1 inch across, borne on long, smooth
stalks up to 2 3/4 inches long.
- Sepals: 5, green, united below and also to the ovary, the lobes up to 1/2 inch long.
- Petals: 5, yellow, free from each other, up to 3/4 inch long.
- Stamens: 10.
- Pistils: Ovary inferior.
- Fruits: Capsules elongated, cylindric, smooth, up to 2 inches long, up to 1/6 inch wide, with
the sepals persistent; seeds smooth, embedded in the capsule.
- Notes: This species tends to be aggressive and can form dense mats in shallow water. It used
to be known as Jussiaea diffusa or J. repens.
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