Invasive SpeciesEuropean naiad

Najas minor
NOT FOUND by EyesOnTheWater
ID Confirmed
Quality checked by vitalsleuth
Peer reviewed by vitalsleuth
Field Notes
35 people, 11 kayaks, 1 adirondack guide boat, and 5 motor boats! WOW! The Lovell Invasive Plant Prevention Committee (LIPPC) and Kezar Lake Watershed Association (KLWA) joined forces for their first ever Eyes on the Water community-wide effort to monitor lakes and ponds in the Kezar Lake Watershed for invasive aquatic plants. Boats left the landing and returned an hour later with plant samples that were found by bucketscope, snorkel, and by just looking around. Some mucked around the dock and used the weed weasel to reach submersed plants. Upon return, samples were placed in large bins according to key identifying characteristics. We're pleased to report we found no suspicious plants! It was an incredible day on the water with so many people motivated and excited to steward this special lake. The next community-wide effort will be on August 8. Details about this event are in the Field Missions section: Join us!
A sketch of our study site.
Supporting Evidence
Photo of my evidence.
At first glance, we thought this plant's thin stems and thin leaves looked like European naiad. We quickly ruled the invader out, though, after seeing the smooth edges (European naiad has toothed, spiny edges) and distinct whorls.
Photo of my evidence.
We think this may be a native stonewort - Nitella? Really cool that stoneworts are macro algae. Next time we'll break out the hand lens and check out the cells!
Photo of my evidence.
Another shot of the whorls and branching pattern - both very different than that of European naiad.
Species Observation: Species Looked For
Did you find it?: 
I think I did not find it
Scientific name:
Najas minor
Common name:
European naiad
Sampling method: 
Just looking around
Photo of our sampling method.
Place Studied
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Map this species
N 44.241060 °
W -70.884980 °
Observation Site Information
A photo of our study site.
Freshwater - In a pond or lake
Trip Information
Kezar's North End boat launch (Lovell Landing Rd)
Trip date: 
Sat, 2011-07-09 14:00
Town or city: 
Type of investigation: 
Species and Habitat Survey
MIDAS Code: 
Habitat Observations
Species diversity: 
Evidence of vectors: 
Boat ramp
Dirt road
Water temperature: 
Dissolved oxygen: 


You nailed it: this is a species of macroalgae in the genus Nitella. Clearly you studied up on your aquatics before you hit the water on Saturday. One five-acre pond in southern Maine has European naiad. Thanks for keeping a lookout for this invasive plant along with the other 10 that are prohibited in Maine. Kudos to the Eyes on the Water effort in Kezar Lake Watershed.