By: Natalie Bonitz

Distribution

Facts Forms mats of vegetation Doesn’t spread into deeper water Fish have a hard time swimming through the mats Adapted to water level changes Washington listed as a quarantined plant

Identification Bright green fir-tree-like; emergent leaves and stems Leaflets arranged in whorls (4-6) around the stem Leaflets with feather-like leaf arrangement Dense mat of intertwined brownish stems (rhizomes) in the water Reddish, feathery-leaved, limp, underwater leaves may be present White flowers

In Flower

Source Native to South America Amazon River Introduced in the late 1800s

Reproduction All female plants Perennial

Control Methods Hard to control Herbicides aren’t very effective Not palatable to fish Mechanical methods spread the rhizomes

Resources rrot.html rrot.html ua003.html ua003.html aquatic-herbicide.html aquatic-herbicide.html

Questions? Uh OH!