Northern Prairie Wildlife Research Center
Southern Wetland Flora
Field Office Guide to Plant Species
Ludwigia decurrens Walter
- Family: Evening Primrose (Onagraceae)
- Flowering: June-October
- Field Marks: This is the only Ludwigia that has leaves with a wing at the point of attachment.
The wing continues down the stem for a short distance. There are 4 large, yellow petals and 8
- Habitat: Wet ground, sloughs, swamps, along streams, ditches, ponds, sandy shores, shoals,
often in shallow water.
- Habit: Annual herb with fibrous roots.
- Stems: Upright, 4-sided, branched or unbranched, smooth, up to 7 feet tall.
- Leaves: Alternate, simple, lanceolate, pointed at the tip, tapering to the base and forming a
narrow wing along the stem, without teeth, smooth or less commonly slightly hairy, up to 4 inches
- Flowers: Solitary in the axils of the leaves, up to 1/2 inch across, sessile or on a short stalk.
- Sepals: 4, green, united below to form a long tube, the lobes up to 1/2 inch long.
- Petals: 4, yellow, free from each other, up to 1/2 inch long.
- Stamens: 8.
- Pistils: Ovary inferior.
- Fruits: Capsules obconic, smooth, 4-angled, up to 1 inch long.
- Notes: For many years this species was known as Jussiaea decurrens. The capsules persist
as long as the plant is standing.
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