Lake Arrowhead has a few known locations of Myriophyllum verticillatum, whorled water milfoil, a native leafy milfoil.
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We have confirmed these sightings by visiting the locations in the fall when its distinctive club-shaped winter buds (turions) at leaf nodes are visible.
There are 4 locations marked with a red dot on the following map, though there are a few more instances that aren't noted:
