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Parrotfeather Myriophyllum aquaticum

Parrotfeather Myriophyllum aquaticum. 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 .

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Parrotfeather Myriophyllum aquaticum

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  1. ParrotfeatherMyriophyllumaquaticum By: Natalie Bonitz

  2. Distribution

  3. 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

  4. 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

  5. In Flower

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

  7. Reproduction • All female plants • Perennial

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

  9. Resources • http://www.ecy.wa.gov/programs/wq/plants/weeds/parrot.html • http://www.ecy.wa.gov/programs/wq/plants/weeds/aqua003.html • http://boggycreekpondsupply.com/navitrolr-granular-aquatic-herbicide.html

  10. Questions? Uh OH!

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