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Plant Form: Mostly submerged aquatic perennial herb.
Size: Rooted up to 7 m deep.
Stem: Hairless, reddish-brown to whitish-pink, thin, branching near the water surface. Leafless towards base.
Leaves: Feather-like, divided into many pairs of leaflets, olive-green, 1.5-4 m long, in a whorl around the stem, usually submerged.
Flowers: In whorls of 4 above water in upright spike 5-20 cm long. Male flowers above female flowers and have pink petals, whereas female flowers lack petals.
Fruit and Seeds: Egg-shaped, red, 3 mm long, containing 4 dry 1-seeded nutlets.
Habitat: Ponds, reservoirs, lakes.
Distinguishing Features: Parrot's feather (Myriophyllum aquaticum) leaves are similar, but don't tend to be submerged. Native Watermilfoil (Myriophyllum salsugineum) also tends to have emergent leaves.