Ludwigia alternifolia
Ludwigia alternifolia, commonly known as seedbox, bushy seedbox, rattlebox, and square-pod water-primrose, is a herbaceous perennial plant of the family Onagraceae. It is native to central and eastern North America, growing in marshes, wet meadows, and swamps. It has yellow, four-petaled flowers and brown seed pods that are shaped like a cube.
Description
Ludwigia alternifolia grows tall on reddish-tinged stems. Leaves are deep green, sharply-pointed, and lance-shaped. They are arranged alternately on the stem and are long and across. The margins are smooth and sometimes slightly ciliate or reddish. The leaves either have short petioles or are sessile.Flowers are usually single, growing from the leaf axils on upper leaves. They have four yellow petals and four light green sepals. The mature fruits are brown, cubic capsules with rigid sides, about in length.