Ruppia maritima is a grass-like, thread-thin annual or perennial herb that emerges from a rhizome that is slightly embedded in the moist substrate. It yields an inflorescence that is straight, long, slender, and loosely coiled, with two little flowers at its tips. rhizome with nodes spaced zigzag apart. no stalks; leaves emerge in an alternate pattern straight from rhizomes; The leaves are flat, very narrow, up to 1 mm broad, and pointed at the ends. They can reach a length of 10 cm (4 in). The leaves are green to orange in color, with numerous leaf blades coming from each sheath. The base of the leaves are enclosed in sheaths with rounded tips. may bear fruit in the form of pears or clusters of tiny blooms on separate stalks; Every node at the bottom end of the rhizome has one root extending from it.