recognizing eurasian water-milfoil and native look …may look like dark seeds. printed on recycled...

Eurasian water milfoil is one of eight water- milfoil species found in Wisconsin and the only one that is not native. The most common native water-milfoil in Wisconsin lakes is northern water-milfoil. It bears a strong resemblance to Eurasin water-milfoil and identification between the two plants can be difficult. Using this guide helps to distinguish Eurasian water-milfoil from similar native aquatic plants. Northern Water-milfoil (Myriophyllum sibericum) • Rigid feather-like leaves forming a christmas tree shape. The lower leaflets are usually quite long. • Leaves usually stiff when out of water. • Leaves arranged in whorls (circles) of four to six around stem. • Usually seven to ten leaflet pairs per leaf. • Stem is usually whitish or whitish green in color. Coontail (Ceratophyllum demersum) Coontail is a free-floating aquatic plant without roots. It may be completely submersed or partially floating on the surface. • The leaves are stiff and arranged in whorls. • Each leaf is divided in a forked pattern. • Leaf divisions have teeth along one margin. • Leaves are crowded toward the tip of the stem creating the “coontail” appearance. Recognizing Eurasian Water-milfoil and Native Look-a-Likes The Wisconsin Department of Natural Resources provides equal opportunity in its employment, programs, services, and functions under an Affirmative Action Plan. If you have any questions, please write to Equal Opportunity Office, Department of Interior, Washington, D.C. 20240. This publication is available in alternative format (large print, Braille, audiotape, etc.) upon request. Please call 608/267-7694 for more information. Eurasian Water-milfoil (Myriophyllum spicatum) • Delicate feather-like leaves. Leaflets are mostly the same length. • Leaves are usually limp when out of the water. • Leaves arranged in whorls (circles) of three to five around the stem. • Usually twelve to twenty- one leaflet pairs per leaf. • Long spaghetti- like stems.

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Page 1: Recognizing Eurasian Water-milfoil and Native Look …may look like dark seeds. PRINTED ON RECYCLED PAPER PUB-WT-783 2004 Illustrations by Carol Watkins reprinted with permission from

NorthernWater-milfoil(Myriophyllumsibericum)• Rigid feather-like leaves

forming a christmas treeshape. The lowerleaflets areusually quitelong.

• Leaves usually stiffwhen out of water.

• Leaves arranged inwhorls (circles) of four tosix around stem.

• Usually seven to tenleaflet pairs per leaf.

• Stem is usually whitishor whitish green in color.

Coontail(Ceratophyllumdemersum)Coontail is a free-floatingaquatic plant without roots.It may be completelysubmersed or partiallyfloating on the surface.

• The leaves arestiff and arrangedin whorls.

• Each leaf is divided in aforked pattern.

• Leaf divisions haveteeth along onemargin.

• Leaves are crowdedtoward the tip ofthe stem creatingthe “coontail”appearance.

Recognizing Eurasian Water-milfoiland Native Look-a-Likes

The Wisconsin Department of Natural Resources provides equal opportunity in its employment, programs, services, and functions under anAffirmative Action Plan. If you have any questions, please write to Equal Opportunity Office, Department of Interior, Washington, D.C. 20240.

This publication is available in alternative format (large print, Braille, audiotape, etc.) upon request. Please call 608/267-7694 for more information.

Eurasian Water-milfoil(Myriophyllum spicatum)• Delicate feather-like leaves. Leaflets are

mostly the same length.

• Leaves are usually limp when out ofthe water.

• Leaves arranged in whorls(circles) of three to fivearound the stem.

• Usuallytwelvetotwenty-one leafletpairs perleaf.

• Longspaghetti-like stems.

Page 2: Recognizing Eurasian Water-milfoil and Native Look …may look like dark seeds. PRINTED ON RECYCLED PAPER PUB-WT-783 2004 Illustrations by Carol Watkins reprinted with permission from

Water Marigold(Megalodonta beckii)• Submersed

leaves of watermarigold arearranged inwhorls andcut intomanythread-likedivisions.

• Leaves that growabove the waterare not divided.

• Produces yellow,daisy-likeflowers.

Common Bladderwort(Utricularia vulgaris)• Submersed plant with finely divided leaves.

• Leaves are arranged alternately on the stem.

• Most distinct characteristic is the presenceof “bladders” or sacs to capture smallanimal life.

• Bladders arescattered onleaves or sepa-rate stems andmay look likedark seeds.

PRINTED ON RECYCLEDPAPER

PUB-WT-783 2004

Illustrations by Carol Watkins reprinted with permission from“Through the Looking Glass, A Field Guide to Aquatic Plants”by Susan Borman, Robert Korth, and Jo Temke

Water Crowfoot(Ranunculus spp.)• Submersed plant

with finelydividedleaves.

• Leaves occuralternatelyalong thestem, not inwhorls.

• Smallbuttercup-likeflowers areproducedthat stickup out ofthe water.

Common Waterweed,Elodea (Elodea canadensis)• Submerged plant with slender stems.

• Small lance-shapedleaves attachdirectly to thestem.

• Leaves are inwhorls of three,or occasionallytwo near thestem tips.

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