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Northeast Wetland Flora

Field Office Guide to Plant Species

Narrow-leaf Seedbox
Ludwigia linearis Walter

JPG -- Species Photo JPG -- Distribution Map

Family: Evening-primrose (Onagraceae)
Flowering: July-September
Field Marks: This Ludwigia differs by its very narrow, alternate leaves and its sessile fruits much longer than broad.
Habitat: Swamps, wet ditches, wet pine barrens, sometimes in shallow water.
Habit: Perennial herb with fibrous roots.
Stems: Upright, usually unbranched, slender, angular, up to 2 1/2 feet tall, smooth.
Leaves: Alternate, simple, linear to linear-lanceolate, pointed at the tip, tapering to the base, without teeth, sessile, up to 3 inches long, up to 1/4 inch wide, finely granular on the surface.
Flowers: Solitary in the axils of the leaves, sessile.
Sepals: 4, green, united below to form a tube, the lobes triangular, 1/6-1/4 inch long.
Petals: 4, yellow, free from each other, about as long as the sepal lobes.
Stamens: 8.
Pistils: Ovary inferior, 4-sided.
Fruits: Capsule bell-shaped, 4-sided, 1/4-1/2 inch long, containing several elongated seeds.

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U.S. Department of the Interior | U.S. Geological Survey
URL: http://www.npwrc.usgs.gov/resource/plants/florane/species/8/ludwline.htm
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Page Last Modified: Saturday, 02-Feb-2013 06:17:29 EST
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