Floating Primrose Willow - Alternate Leaf Seedbox -
Ludwigia alternifolia - Linnaeus
Onagraceae (Evening Primrose) Family
Plant is a sprawling species of flowering plant in the evening primrose family. It is native to many parts of the Americas, as well as on many continents and spreads easily to become naturalized. It is well known as a troublesome aquatic noxious weed that invades water ecosystems and can clog waterways. Its preferred habitat is in moist to wet to flooded areas. The stem can creep over 6 feet long, sometimes branching. It spreads to form mats on the mud, or floats in the water.
The leaves are several centimeters long and are borne in alternately arranged clusters along the reddish stem.
The flower has 4 to 6 lance-shaped sepals beneath a corolla of 4 to 6 bright yellow petals up to 1/2 inch long. The yellow flowers are produced and reproduction occurs thereafter. Unfortunately, the sexual reproduction of these plants are relatively unknown due to lack of research and can vary from species to species. Flowers occur in the summer and into autumn.
The fruit is a hard, cylindrical capsule.