Myriophyllum L. >

Aquatic plants or growing on mud. Petals absent in female flowers Myriophyllum

consider the other alternative

At least submerged leaves whorled or opposite

consider the other alternative

Leaves opposite, linear to filiform with terete segments, entire or 3-fid, 5–20 mm long. Mericarps smooth or rugose. Swampy areas in heath Myriophyllum pedunculatumlongibracteolatum