Robbins' Pondweed (Potamogeton robbinsii Oakes)

Robbins' Pondweed (Potamogeton robbinsii)


Robbins' Pondweed (Potamogeton robbinsii Oakes), also known as Fern-leaf Pondweed, is a fully submerged, stout, perennial, vascular plant in the Pondweed Family ( Potamogetonaceae) and Najadales order. This plant is very distinctive and is seldom confused with another water plant. However, it may hybridize with other water plants. The genus name is from the Greek for "river." The species name is in honor of James Watson Robbins (1801 to 1879).

The leaves of this plant are olive-green to brown and arranged alternately along the steam to form a flat fern-like arrangement. They are linear with a prominent mid-vein and other less prominent parallel veins The width of each leaf is about ¼ inch (6 millimeters) and the length can be as long as 5 inches (12 centimeters).  The edges are very finely serrated. The base of each leaf wraps about half way around the stem.

Robbins' Pondweed (Potamogeton robbinsii) Detail

The stems can be as long as 10 feet (3 meters). They creep along the bottom of the pond and will root at various places along the stem.

The flowers are very small with four, petal-like, whorled lobes on spikes near the surface of the water. The fruits are seeds about 1/6 inches (4 millimeters) long.

The root system is a rhizome.

This plant is a source of food for a number of aquatic animals.


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