Virginia Tech Weed Identification Guide

Eurasian Watermilfoil: Myriophyllum spicatum

Weed Description:  A mostly submersed perennial with feathery-like leaves that can spread and reproduce by fragmentation of the stems.

Leaves:   Leaves are finely divided and take on a stiff, feathery appearance.  Leaves occur in whorls of 4 and are up to 1 inch in length, with at least 12 stiff leaflets that occur oppositely from one another.

Stems:  Stout, rooting often.   Fragmented stems are capable of producing new plants.
Flowers: Flowering stems are usually emersed and inconspicuous.

Identifying Characteristics: Emersed perennial aquatic weeds with leaves that are divided into many stiff leaflets that resemble a feather.