Ruppia maritima L.

Species Identity and Growth Form

Ruppia maritima L. is a thread-thin, grasslike annual or perennial herb. It grows from a rhizome anchored shallowly in wet substrate.

Inflorescence and Flower Structure

It produces a long, narrow inflorescence that is either straight or loosely coiled, tipped with two tiny flowers.

Pollination Mechanisms

This plant often self-pollinates, but its flowers also release pollen that floats away on bubbles to reach other plants.

Fruit Characteristics and Dispersal

Its fruits are drupelets, which are dispersed in water, as well as inside the digestive systems of fish and waterbirds that eat them.

Vegetative Reproduction

This species also reproduces vegetatively by sprouting new growth from its rhizome to form colonies.

Geographic Range and Habitat

It can be found worldwide, most commonly in coastal areas, where it grows in brackish water bodies like marshes. It is a dominant plant in many shoreline regions.

Suboptimal Growth Conditions

It does not grow well in turbid water or low-oxygen substrates.