Ludwigia alternifolia - Linnaeus
Onagraceae (Evening Primrose) Family
The leaves are alternate, sessile or short petiolate, elliptic to lanceolate in outline, with entire margins; smooth with a few scattered hairs.
The flowers have an inferior ovary. There are 4 triangular sepals and 4 yellow petals. The petals fall off easily.
The fruit is a 4-sided, short capsule; released through a pore in the top of the capsule. The fruit looks somewhat like a salt shaker and is sometimes used in dried flower arrangements. This wetland plant bears a distinctive, box-like fruit; square on top and filled with many seeds.