Rooted weed with mostly underwater, dark-green, feathery leaves grouped in fours around a hollow pinkish stem.
- English Name: Northern Watermilfoil
- Latin Name: Myriophyllum sibiricum
- Propogate: Vegetative fragmentation
- Symptoms: Underwater weed with dark-green, feathery leaves grouped in fours around a hollow pinkish stem
- Dangers: Clogs water, inhibites other aquatic plants