Robbin’s pondweed has thick and course submersed leaves with a prominent yellow vein in the middle.
Robbin’s pondweed does not produce floating leaves. The submersed leaves are alternately attached, dark green to reddish, three-fourths of an inch to nearly three inches long, one-eighth to one-third inch wide, lance-shaped, and pointed at the tip. There is a bright yellow midvein with 20 to 60 lateral veins that are faint except for about five of them. Round stems branch frequently near the upper plant when flowering and there is much less branching in the lower plant. Robbin’s pondweed flowers occur on a small cylindrical spike that weakly rises above or near the surface of the water. The flower spike is one-fourth to three-fourths of an inch long with three to five whorls of little green four-part flowers.
Robbin’s pondweed can be found in water two to 20 feet deep. In mid to deeper waters it can create dense colonies of dark green with leaves that look like fern fronds.
Robbin's pondweed can be found in the northern half of the United States.