Northern Prairie Wildlife Research Center
Lanceleaf Loosestrife (Lysimachia lanceolata)
- Family: Primrose (Primulaceae)
- Flowering: May-August.
- Field Marks: This loosestrife is recognized by its linear-lanceolate or lanceolate leaves and its elongated stolons.
- Habitat: Wet woods, wet prairies, along rivers, around lakes and ponds, swamps.
- Habit: Perennial herb with creeping stolons.
- Stems: Erect, often branched, smooth, up to 2 feet tall.
- Leaves: Opposite, simple, the middle and upper ones linear-lanceolate to lanceolate, more or less pointed at the tip, tapering to a short-ciliate base, without teeth, ciliate along the edges, usually roughened on the lower surface, up to 4 inches long, up to 1/2 inch broad.
- Flowers: Yellow, on slender stalks from the axils of the uppermost leaves.
- Sepals: 5, green, free from each other, up to 1/3 inch long.
- Petals: 5, yellow, attached only at the base, up to 1/2 inch long, minutely toothed.
- Stamens: 5.
- Pistils: Ovary superior.
- Fruits: Capsules nearly spherical, smooth, with many seeds.
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