curly-leaf pondweed growth & identification barbara liukkonen university of minnesota extension...
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Curly-leaf PondweedCurly-leaf PondweedGrowth & IdentificationGrowth & Identification
Barbara LiukkonenUniversity of Minnesota Extension Service
Carver County, June 16, 2006
Curly Leaf Pondweed Non-native, “Exotic” Aquatic Invasive Species or AIS Submergent aquatic plant Potamogeton crispus Similar to other pondweeds Can be very invasive
HabitatHabitat Deep water Deep water
plant plant Colonizes water Colonizes water
1–2 feet deep1–2 feet deep Spreads Spreads to
depths of 10 or depths of 10 or more feetmore feet
Tolerates low Tolerates low lightlight
Growth habitatGrowth habitat Grows well in Grows well in
disturbed sitesdisturbed sites Can grow under Can grow under
algae or snow- or snow-covered icecovered ice
Strong roots allow Strong roots allow growth in lakes or growth in lakes or moderate streamsmoderate streams
Curly-leaf Life Cycle
Its unique life cycle gives curly leaf a
competitive advantage over many other aquatic plants
Life cycleLife cycle
Autumn/winterAutumn/winter Sprouts buds from Sprouts buds from
turionsturions Remains alive during Remains alive during
winterwinter Can grow under iceCan grow under ice
SpringSpring Rapid growth while Rapid growth while
other plants continue other plants continue dormancydormancy
J.R. Wehrmeister and R.L. Stuckey. 1992. Life History of Potamogeton crispus. Mich. Botanist. 31(1):3-16
summer
fallspring
winter
Life cycleLife cycle
Spring/summerSpring/summer May form dense May form dense
matsmats Flower Flower
spikes/seedsspikes/seeds Turions form in Turions form in
leaf axilsleaf axils
summer
fallspring
winter
J.R. Wehrmeister and R.L. Stuckey. 1992. Life History of Potamogeton crispus. Mich. Botanist. 31(1):3-16
Life cycleLife cycle
J.R. Wehrmeister and R.L. Stuckey. 1992. Life History of Potamogeton crispus. Mich. Botanist. 31(1):3-16
summer
fallspring
winter
Summer/fallSummer/fall Turions drop Turions drop Disperse by water Disperse by water
movementmovement Sink to bottom of Sink to bottom of
lakelake Lie dormantLie dormant Cycle begins Cycle begins
againagain
Curly Leaf IdentificationCurly Leaf IdentificationKey point # 1Key point # 1 Leaves grow in an Leaves grow in an
alternate pattern along alternate pattern along the stemthe stem
Typical in many Typical in many pondweedspondweeds
Curly Leaf IdentificationCurly Leaf IdentificationKey point #2Key point #2 Branching vein Branching vein
patternpattern Only pondweed with Only pondweed with
branching vein branching vein patternpattern
Curly Leaf IdentificationCurly Leaf IdentificationKey point #3Key point #3 Serrated leaf marginSerrated leaf margin Only 1 other Only 1 other
pondweed species pondweed species has serrated marginhas serrated margin
Curly Leaf IdentificationCurly Leaf Identification
Leaves are very Leaves are very wavy and may be wavy and may be reddish in color, reddish in color, but this is not but this is not unique to curly unique to curly leaf pondweedleaf pondweed
Look-alike plantsLook-alike plantsCurly leaf pondweedPotamogeton crispis
Richardson’s pondweedPotamogeton richardsonii
• Smooth leaf margin
• Vein pattern is parallel
• Leaf clasps stem
• Serrated leaf margin
• Branching vein pattern
• Leaves not clasping stem
Recommended Reading:Recommended Reading: Through the Looking Glass: A Field Guide Through the Looking Glass: A Field Guide
to Aquatic Plantsto Aquatic Plants by Borman, S., Korth, R. & Tempte, J. by Borman, S., Korth, R. & Tempte, J. (1997). Available from the Wisconsin (1997). Available from the Wisconsin Lakes Partnership at (715) 346-2116Lakes Partnership at (715) 346-2116
Special thanks to:Special thanks to: Mary Blickenderfer, UM Extension ServiceMary Blickenderfer, UM Extension Service Eleanor Burkett, UM Extension ServiceEleanor Burkett, UM Extension Service Wendy Crowell, MN Department of Natural Wendy Crowell, MN Department of Natural
ResourcesResources Cynthia Hagley, MN Sea Grant ProgramCynthia Hagley, MN Sea Grant Program
The information and drawings in this slide show are copyright by The information and drawings in this slide show are copyright by the Board of Regents of the University of Minnesota, 2006. If you the Board of Regents of the University of Minnesota, 2006. If you want to reproduce or reuse them, please contact Barb Liukkonen, want to reproduce or reuse them, please contact Barb Liukkonen, [email protected]@umn.edu, or Mary Blickenderfer, , or Mary Blickenderfer, [email protected]@umn.edu from the University of Minnesota Extension Servicefrom the University of Minnesota Extension Service