Ruppia cirrhosa

Ruppia cirrhosa (syn. Ruppia spiralis), spiral tasselweed, is a species of aquatic plant in the pondweed family, with a cosmopolitan distribution, that grows in brackish to saline waters. It has long, thin leaves that often form a dense layer under the surfaces of coastal ditches, lakes and lagoons. The flowers are tiny and petal-less, and produce pollen that is dispersed by the wind or floating on the water. The name refers to its ability to produce a long, coiled stalk to the fruiting inflorescence, which is not often seen....read more on Wikipedia.