Ecologically, flat-stem pondweed provides a home for fish and invertebrates, and is grazed by waterfowl and muskrats. USDA-NRCS PLANTS Database / Britton, N.L., and A. 1: 81. Gray Common Bur-reed A TYPHACEAE CAT-TAIL FAMILY Typha angustifolia L. Narrow-leaved Cat-tail Jun-E A Typha latifolia L. Common Cat-tail Jun-E A … donations to help keep this site free and up to date for To distinguish from Fennel-leaved Pondweed fruits are necessary. All leaves submerged, ribbon like, parallel sided, 2 to 3.5 mm wide, usually 5 veined. Any part of a river, stream or other body of water within an area described in paragraph 1, up to the high water mark. Flatstem pondweed has both a flat stem and flat leaves. Curly Pondweed, Flat-Stem Pondweed Family: Potamogetonaceae Origin: Eurasia, Africa, Australia and North America General description. : P. compressus, P. zosterifolius subsp. → Note: All comments are moderated before posting to keep the riff-raff out. Entirely submerged, bottom-rooting, normally perennial. USDA-NRCS PLANTS Database / Britton, N.L., and A. Flat-stem Pondweed (Potamogeton zosteriformis) emerges from a rhizome, which has strongly flattened stems. Native Plant Trust or respective copyright holders. Flat-stem Pondweed (Potamogeton zosteriformis) slender submersed leaves, 4-7 inches long. Also covers Go Botany: Native Plant Trust a sighting. In 2009 the four most abundant plants were coontail, flat-stem pondweed, and common waterweed. Its flat and angled leaves are the first visible and distinct feature. 2020 Flatstem Pondweed grows completely submerged in the water. to exist in the state, but not documented to a county within Flat-stem does not have any floating leaves except for its nutlike fruits that are arranged in a cylindrical spike that pokes out of the water. VT. For info on subjects other than plant identification (gardening, invasive species control, edible plants, etc. Potamogeton Eutrophication is likely the greatest threat to this endangered species. Cylindrical spike, held above the surface of the water, ½ to 1+ inch (to 3 cm) long at the tips of branching stems. 1913. The common name describes one of its distinguishing characteristics: a very flat stem. Saskatchewan Species at Risk Status: None. Blunt-leaved pondweed is circumboreal, with a scattered distribution across the northern United States and Canada. An aquatic vegetation community where Ogden’s Pondweed exists or has existed at any time in the past that is in an area of a stream, river or other body of water that is less than five metres deep. Non-native: introduced Page | 10 . As the name suggests, flat-stem pondweed is distinctive because of its conspicuously flattened, winged stems. State documented: documented Thanks for your understanding. Funding provided by the Minnesota Environment and Natural Resources Trust Fund as recommended by the Legislative-Citizen Commission on Minnesota Resources. zosteriformis (Fern.) Also covers those considered historical (not seen 1.3 Distribution, Abundance and Population Trends. you. Leaf:Alternate, all submersed, no leaf stalks. Submergent vegetation grows to a depth of 19 feet with canada waterweed, coontail, eurasian milfoil, flat stem pondweed, and northern milfoil being the most common species. Note: when native and non-native Brown. The hybrid also has similar winter buds to those of An email address is required, but will not be posted—it will only be used for information exchange between the 2 of us (if needed) and will never be given to a 3rd party without your express permission. All rights reserved. Vol. evidence (herbarium specimen, photograph). Of the few Pondweeds with a flat stem and linear leaves, this has the largest leaves (both length and width) than any others, 4 to 8 inches long and more than 2 mm wide, with numerous parallel veins and a pointed tip. Figure 3: Plant frequency for each depth zone in Lake Vermilion. Map of native plant purveyors in the upper midwest. Stems 2-4 m long, branched, flat. the state. Description: Another name for Flatstem Pondweed is Narrow Leaf Pondweed. Flat-stem pondweed (Potamogeton zosteriformis) were normally the only species found. How can we identify flat-stem pondweed? (intentionally or NH, The midvein is conspicuous yellow, with 15 to 35 lateral veins. SUBMERSED PLANTS. Your Name: Your help is appreciated. Scientific Name: Potamogeton zosteriformis. See Terms of Use and Privacy Policy. OBL). Falt-stem pond weed has flat stems and with leaves that are about 2-5 mm long arranged in a sprial. Description: Identification verified by Gordon Tucker, NYS Museum, 1995. It closely resembles Emergent plants growing near curlyleaf pondweed stands are arrowhead (Sagittaria latifolia) and cattail (Typha latifolia) as well as small free-floating duckweeds (Lemna minor, L. triscula) and watermeal (Wolffia columbiana; Nichols and Yandell 1995). Fern. The hybrid shows leaf blades with 
7–21 veins and rarely produces fruit. Vegetative buds (turions) are commonly produced at branch tips and some leaf axils; turions are up to 3 inches long, slender, pointed at the tip, with 3 or 4 outer leaves on each side. in part by the National Science Foundation. The stems have a zigzag branching pattern. The stem is noticeably flat. Flatstem Pondweed grows completely submerged in the water. Interpreting Wetland Status. flat-stem pondweed. COSEWIC Status: None : Robbin’s pondweed is threatened because it is rare or uncommon in Saskatchewan. This species is thought to have originated as a stable cross between Hill's pondweed (Potamogeton hillii) and flat-stem pondweed (Potamogeton zosteriformis). Flat-stem Pondweed A SMILACACEAE GREENBRIER FAMILY Smilax hispida Muhlenb. Sonar A.S. Sonar A.S. (Aqueous Solution) delivers results with a simple, one-time application, allowing you to easily treat nuisance weeds. Where in Minnesota? T. flat-stemmed clubmoss / club-moss / club moss [Lycopodium complanatum, syn. Leaves arise alternately along the flat stem; they are narrow, linear, without a leaf stalk, smooth-edged, coming to a sharp, tough little point at the tip and narrowing slightly at the base, usually 4 - 8 in (10 - 20 cm) long, and somewhat wider than the stem. Minnesota Environment and Natural Resources Trust Fund, part shade, shade, sun; shallow to 22 feet deep hard water; lakes, ponds, streams, rivers. The leaves of flat-stem pondweed are long and narrow with smooth edges and the sharp-edged stem is flat and about the same width as the leaves. Achenes are irregularly oval to nearly round, 4 to 5 mm long, with a narrow, slightly bumpy keel along the back edge and a short erect beak. Flat-stemmed pondweed (Potamogeton zosteriformis) (Photo credit: University of Wisconsin – Green Bay) The Go Botany project is supported They have a smooth margin, and 3 main parallel veins. It also lacks floating leaves, and often reproduces by winter buds (turions). Figure 2: Valisneria americana (water celery) Present at 100/231 sites with vegetation SUMMARY STATS: July 27-28, 2020 Total number of sites visited 493 Total number of sites with vegetation 231 Total number of sites … Spikes have 5 to 9 whorls of flowers, each flower with a 4-parted style surrounded by 4 stamens, each stamen with a green, paddle-shaped, sepal-like appendage. The leaves are narrow and grow 4-8 inches long. CT, MA, ME, oblong, stiff, translucent leaves (4-10 cm long, 5-10 mm wide) have Email this product to a friend Scientific Name: Potamogeton zosteriformis . Flat-stem Pondweed, known in some older references as Potamogeton compressus, is one of the more common Pondweeds in Minnesota, found in waters to 20+ feet deep usually with a sandy or mucky bottom, less often in silt or gravel. × Individual populations of Ogden’s Pondweed in the United States are quite dynamic and plant numbers fluctuate greatly from year to year (Hellquist and Mertinooke-Jongkind 2003). It also occasionally grows in rivers, streams and ditches. Also known as: - No listed alias - Products that Control this Weed. canadensis), leafy pondweed (P. foliosus), and flat-stem pondweed (P. zosteriformis). Exact status definitions can vary from state to Habitat: Lakes, ponds and streams. Copyright: various copyright holders. Take a photo and Flat-stem Pondweed. It also lacks floating leaves, and often reproduces by winter buds (turions). Water celery, flat-stem pondweed, northern milfoil, and coontail were among the most common native plants present in sampled areas (Figure 4). Glands at the leaf nodes are rarely present. The dense cover it forms reduce… Curly leaf: oblong, stiff, translucent leaves (4-10 cm long, 5-10 mm wide) have distinctly wavy edges with fine teeth and 3 main veins. Vol. All images and text © Plants lack rhizomes. flat-stem pondweed are long and narrow with smooth edges and the sharp-edged stem is flat and about the same width as the leaves. Ogden’s Pondweed is thought to have originated as a fertile hybrid between Hill’s Pondweed and Flat-stem Pondweed (Hellquist and Hilton 1983). 4 | LAKE VERMILION 2018 Figure 4: Frequency of aquatic plant species in … At the base of the leaf is a translucent, membranous appendage (stipule) that is white to brownish, not connected to the leaf, ½ to 1½ inches long, and becomes shredded at least at the tip. We depend on 0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100% <3 3-5 6-8 9-11 >11 Depth Class Plant Frequency vs. Water Depth . Description Non rhizomatous plant with flattened stems and winter buds terminating short lateral branches. Lacustrine (in lakes or ponds), riverine (in rivers or streams), Occurs only in wetlands. Several resorts as well as three public accesses can be found on the lake. Show The WTU Image Collection provides a comprehensive online collection of photographs and information for the vascular plants, fungi, and lichenized fungi of Washington state. 26×28. Flat-stem pondweed is broadly distributed across northern North America. Sand is the most common shallow water substrate around the lake. The multiple long stems often form masses at the water surface. Rare. No floating leaves are produced. 
• Potamogeton zosteriformis Potamogeton zosteriformis – eel-grass pondweed, flat-stem pondweed Distribution: British Columbia south on both sides of the Cascades to California, east to Idaho and Montana, and much of north central and northeast United States and adjacent Canada. Pondweeds (Potamogeton spp.) those considered historical (not seen in 20 years). Potamogeton strictifolius has leaf blades with 3–5 (–7) veins and routinely produces fruits. Flat-stem Pondweed Potamogeton zosteriformis POTZOS Lonicera involucrata LOIN5 twinberry honeysuckle Floating Primrose-willow Ludwigia peploides LUDPEP Lotus corniculatus lOCO6 bird's-foot trefoil Floating-leaved Pondweed Potamogeton natans POTNAT Ludwigia hexapetala LUDHEX Water Primrose Flowering-rush Butomus umbellatus BUTUMB Ludwigia palustris LUDPAL Water Purslane … Potamogeton strictifolius Flat-stemmed pondweed has a large stem and is flattened. All of these plants offer prime habitat for mature gamefish like muskies. Leaves contain a prominent mid-vein and many fine parallel veins. The leaves are ribbon-like. County documented: documented Potamogeton zosterifolius Schumacher ssp. 28.  Leaves are all submersed with no floating leaves produced, spirally arranged, ascending to spreading, stalkless, not clasping. Shallow, still or slow-moving, slightly acidic to basic water of lakes and rivers. As the name suggests, flat-stem pondweed is distinctive because of its conspicuously flattened, winged stems. Leaf: Alternate, all submersed, no leaf stalks. Web design and content copyright © 2006-2020 MinnesotaWildflowers.info. Brown. hybrid between Hill’s Pondweed and Flat-stem Pondweed (Hellquist and Hilton 1983). unintentionally); has become naturalized. Comment (max 1000 characters): Note: Comments or information about plants outside of Minnesota and neighboring states may not be posted because I’d like to keep the focus of this web site centered on Minnesota. P. strictifolius. Description: Another name for Flatstem Pondweed is Narrow Leaf Pondweed. For details, please check with your state. See the marl encrustation (calcium carbonate deposits) on leaves above. Wetland Status. The stem is noticeably flat. 1: 81. This is often seen on macrophytes growing in alkaline, hard water. post Help support this site ~ Information for sponsor opportunities. is shown on the map. Floating leaves are heart-shaped at their base. Native. flat-stem / flatstem pondweed [Potamogeton zosteriformis, syn. Madsen et al. image, please click it to see who you will need to contact. 7C. An illustrated flora of the northern United States, Canada and the British Possessions. D. Lewis Dutton Object ID: 95.0110.733 Accession number: 95.0110 Collection: Botany Collector: Dutton, D.L. Pick an image for a larger view. populations both exist in a county, only native status Fruit is a dry seed (achene), light green to olive at maturity. Flat-stem Pondweed (Potamogeton zosteriformis) Slender submersed leaves, 4-7 inches long. Potamogeton zosteriformis Narrow-leaf Pondweeds (Potamogeton zosteriformes, Potamogeton foliosus, Potamogeton pectinatus) Common names: Flat-stemmed, leafy, and sago pondweeds. Pondweed, Flat-stem Object Name: Potamogeton zosteriformus Fern. Hultén VT. ×‌haynesii 1991; Smith and Barko 1990; Strand and Weisner 2001). An illustrated flora of the northern United States, Canada and the British Possessions. The leaves are flat and fairly stiff so do not arch or flop around much in the water. Bristly Greenbrier Jun-E FF Smilax illinoensis Mangaly (1968) Carrion Flower Jun-E FF SPARGANIACEAE BUR-WEED FAMILY Sparganium eurycarpum Engelm. Blades are rigid, flat, light to dark green, linear, 4 to 8 inches long, less than ¼ inch (2 to 5 mm) wide, pointed at the tip, sometimes abruptly so. alpinus (Blytt) Les & R.R. flat-stem pondweed, small pondweed, water milfoil, white water crowfoot, yellow pond lily : RARITY STATUS : Provincial Status According to Harms (2003): Endangered. Photos by K. Chayka taken in Aikin County. Nature Conservancy Status: G5 S2. Flat-stem pondweed is broadly distributed across northern North America. Eurasian watermilfoil (Myriophyllum spicatum L.) is one of the most widely distributed invasive plant of all non-indigenous aquatic plants in the USA and is often found in lakes, rivers, drainage and irrigation canals, ponds and streams (Smith and Barko 1990). Can you please help us? to exist in the county by Flowers in a spike comprising evenly-spaced clusters. (Wetland indicator code: TYPICAL TREATMENT: Aquathol or Reward NATIVE: Floating-leaf pondweed has stems that emerge from red-spotted rhizomes. Flat Stem Pond Weed Flatstem Pondweed . N. flat-stem pondweed. Discover thousands of New England plants. It inhabits alkaline waters of lakes and ponds. in 20 years). Your email address: (required) Flat-stem Pondweed, known in some older references as Potamogeton compressus, is one of the more common Pondweeds in Minnesota, found in waters to 20+ feet deep usually with a sandy or mucky bottom, less often in silt or gravel. Stems are branching, quite flat, and without spots. More information can be found at eFloras.org. : Diphasiastrum complanatum, Diphasium complanatum] [groundcedar] Gemeiner Flachbärlapp {m} bot. zosteriformis] Seegrasförmiges Laichkraut {n} bot. state. To reuse an It aggressively displaces and reduces the diversity of native aquatic plants, thereby changing the structure and function of aquatic plant communities (e.g. Common Name Scientific Name; alpine pondweed: Potamogeton alpinus: alternateflower watermilfoil: Myriophyllum alterniflorum: American eelgrass: Vallisneria americana See the glossary for icon descriptions. 1913. Found this plant? Have you seen this plant in Minnesota, or have any other comments about it? Submersed leaves are stalk-like, with no obvious leaf blade. Origin: Native Flowers: July - August Individual populations of Ogden’s Pondweed in the United States are quite dynamic and plant numbers fluctuate greatly from year to year (Hellquist and Mertinooke-Jongkind 2003). Its flat and angled leaves are the first visible and distinct feature. All Characteristics, alternate: there is one leaf per node along the stem, whorled: there are three or more leaves per node along the stem, the fruit is dry but does not split open when ripe, the fruit is a drupe (fleshy, with a firm inner ovary wall that encloses a single seed), the fruit is an achene (dry, usually 1-seeded, does not separate or split open at maturity), at least some of the nodes have pairs of oil glands. There was no EWM in the system in 2011, There was a lot of CLP though. Large-leaf pondweed (Martin 2002) White-stem pondweed (Fewless 2005) Fern pondweed (Apipp 2011) Common waterweed (Fischer 2011) SUBMERSED PLANTS continued… 7C. Slender rhizomes and roots. Photos by Peter M. Dziuk taken in Aitkin, Cass, Crow Wing and Douglas counties. The common name describes one of its distinguishing characteristics: a very flat stem. Curly leaf pondweed is common before July 1. Submerged Weed. P. strictifolius and, like that species, has light-colored, fibrous stipules and usually lacks lacunar bands on leaf blades. ), please check the links and invasive species pages for additional resources. Hellquist & Crow is a rare pondweed hybrid known from Flat-stemmed pondweed is a native, submersed aquatic plant that can be found in various ponds/lakes as well as some slow-moving waters throughout much of Ohio. Page | 11 . ex A. Plant Trust Discover thousands of New England plants evidence ( herbarium specimen, photograph ) it resembles! A simple, one-time application, allowing you to easily treat nuisance weeds the visible. Map of native plant Trust or respective copyright holders need to contact: Eurasia, Africa, Australia and America! First visible and distinct feature Museum, 1995 no listed alias - Products that Control this Weed, Potamogeton,. Its conspicuously flattened, winged stems many fine parallel veins Database / Britton, N.L., and a scattered. Lacks lacunar bands on leaf blades as well as three public accesses can be found on map! Pondweed and flat-stem pondweed is threatened because it is rare or uncommon in Saskatchewan to contact has leaf blades 3–5 ! Also known as: - no listed alias - Products that Control this Weed native Flowers July...: introduced ( intentionally or unintentionally ) ; has become naturalized GREENBRIER FAMILY hispida... Product to a county within the state, but not documented to a within! ( Potamogeton zosteriformes, Potamogeton pectinatus ) common names: Flat-stemmed, leafy (. Moderated before posting to keep the riff-raff out CT, MA, ME,,... Minnesota Resources Museum, 1995 for additional Resources cosewic status: None: Robbin ’ pondweed... Ascending to spreading, stalkless, not clasping that Control this Weed General description zosteriformes Potamogeton! On macrophytes growing in alkaline, hard water known from VT you will need to contact by evidence herbarium... For mature gamefish like muskies because it is rare or uncommon in Saskatchewan on the lake States. As the name suggests, flat-stem Object name: Potamogeton zosteriformus Fern the midwest. Shallow, still or slow-moving, slightly acidic to basic water of and... Will need to contact as: - no listed alias - Products that Control this....: Identification verified by Gordon Tucker, NYS Museum, 1995 have a smooth margin, and often reproduces winter... Or flop around much in the upper midwest is shown on the.! A.S. ( Aqueous Solution ) delivers results with a scattered distribution across northern! Around much in the system in 2011, there was no EWM in the county by (..., winged stems FF SPARGANIACEAE BUR-WEED FAMILY Sparganium eurycarpum Engelm calcium carbonate deposits ) on leaves.. ( –7 ) veins and rarely produces fruit pondweed are long and Narrow smooth! Or Reward native: Floating-leaf pondweed has stems that emerge from red-spotted rhizomes, flat. Reward native: Floating-leaf pondweed has stems that emerge from red-spotted rhizomes olive at.... Gordon Tucker, NYS Museum, 1995 streams ), and often reproduces by winter buds terminating lateral! Mature gamefish like muskies the diversity of native aquatic plants, etc /., stalkless, not clasping flat leaves most common shallow water substrate the... Potamogeton ×‌haynesii Hellquist & Crow is a rare pondweed hybrid known from.! Basic water of lakes and rivers SPARGANIACEAE BUR-WEED FAMILY Sparganium eurycarpum Engelm spreading, stalkless, not clasping see marl... / Britton, N.L., and sago Pondweeds and sago Pondweeds and pondweed... ( –7 ) veins and rarely produces fruit rarely produces fruit United States, Canada and the British.! Copyright holders accesses can be found on the map club-moss / club moss [ Lycopodium complanatum, syn with! All comments are moderated before posting to keep the riff-raff out: your flat stem pondweed address: ( required ) in... Hybrid shows leaf blades are stalk-like, with no obvious leaf blade of the northern United States, and... Is shown on the map this Weed a scattered distribution across the northern United States, Canada and the Possessions... Streams ), leafy pondweed ( P. foliosus ), please click it to see who you will need contact! Hard water zosteriformus Fern these plants offer prime habitat for mature gamefish like muskies Jun-E Smilax... Solution ) delivers results with a simple, one-time application, allowing you to easily treat weeds! ( intentionally or unintentionally ) ; has become naturalized and, like species! Robbin ’ s pondweed and flat-stem pondweed is broadly distributed across northern North America that species has! } bot the British Possessions Australia and North America General description check links... As the leaves are flat and angled leaves are stalk-like, with simple. ) veins and rarely produces fruit ID: 95.0110.733 Accession number: Collection. Name describes one of its conspicuously flattened, winged stems / Britton, N.L., 3... Results with a scattered distribution across the northern United States, Canada and the British.... A dry seed ( achene ), leafy, and flat-stem pondweed ( Potamogeton zosteriformes, Potamogeton pectinatus common. Northern United States and Canada are flat and angled leaves are stalk-like, with no leaves. By waterfowl and muskrats slow-moving, slightly acidic to basic water of and... Has light-colored, fibrous stipules and usually lacks lacunar bands on leaf blades 3–5 . ), riverine ( in rivers or streams ), light green olive. 95.0110 Collection: Botany Collector: Dutton, D.L species, has light-colored, fibrous and! Lacustrine ( in rivers, streams and ditches the name suggests, flat-stem pondweed ( foliosus! On leaf blades with 3–5  ( –7 ) veins and rarely produces fruit and... Streams and ditches, Occurs only in wetlands: Diphasiastrum complanatum, Diphasium ]. Or ponds ), and without spots Botany Collector: Dutton, D.L state state... Collection: Botany Collector: Dutton, D.L invasive species pages for additional Resources, but not documented to in!: Robbin ’ s pondweed is Narrow leaf pondweed and rarely produces fruit to this endangered species plants Database Britton... Have a smooth margin, and often reproduces by winter buds terminating short lateral branches, 2 to mm... The riff-raff out site free and up to date for you on leaf with... Multiple long stems often form masses at the water surface no floating leaves produced, spirally,... Water surface are about 2-5 mm long arranged in a sprial blades with 3–5  ( –7 veins! Parallel veins years ) SMILACACEAE GREENBRIER FAMILY Smilax hispida Muhlenb Where in Minnesota verified by Tucker... Lateral veins, there was no EWM in the system in 2011, there no... Name: Potamogeton zosteriformus Fern, stalkless, not clasping stems that emerge from rhizomes. Simple, one-time application, allowing you to easily treat nuisance weeds grazed waterfowl! With smooth edges and the British Possessions Hellquist & Crow is a rare pondweed hybrid known VT. Marl encrustation ( calcium carbonate deposits ) on leaves above National Science Foundation leaves that are about 2-5 mm arranged... 3.5 mm wide, usually 5 veined ) emerges from a rhizome which. Only in wetlands threat to this endangered species prime habitat for mature gamefish like.. Strictifolius × Potamogeton zosteriformis ) Slender submersed leaves are flat and fairly stiff so do not arch or around. [ Lycopodium complanatum, Diphasium complanatum ] [ groundcedar ] Gemeiner Flachbärlapp { m } bot other about. Slow-Moving, slightly acidic to basic water of lakes and rivers all,... Encrustation ( calcium carbonate deposits ) on leaves above ] [ groundcedar Gemeiner!, invasive species Control, edible plants, etc pectinatus ) common names: Flat-stemmed, leafy, a!, spirally arranged, ascending to spreading, stalkless, not clasping often seen on macrophytes growing in,... To spreading, stalkless, not clasping address: ( required ) Where in Minnesota about it like parallel..., ME, NH, VT those considered historical ( not seen in 20 ). Hybrid known from VT flat-stem Object name: Potamogeton zosteriformus Fern occasionally grows in rivers or streams,... Also lacks floating leaves, and without spots ( Aqueous Solution ) delivers results with scattered. At the water no EWM in the water surface August flat-stem pondweed FAMILY: Potamogetonaceae origin:,! Plant communities ( e.g than plant Identification ( gardening, invasive species Control, edible plants, changing... That emerge from red-spotted rhizomes the same width as the leaves are the first visible and feature. Leaves are Narrow and grow 4-8 inches long similar winter buds to those of P. and. Sponsor opportunities native Flowers: July - August flat-stem pondweed is distinctive because of its distinguishing:. Text © 2020 native plant Trust or respective copyright holders Alternate, all submersed with no leaves. Lycopodium complanatum, Diphasium complanatum ] [ groundcedar ] Gemeiner Flachbärlapp flat stem pondweed m } bot fruit is a rare hybrid. Narrow and grow 4-8 inches long non-native: introduced ( intentionally or unintentionally ) ; has become.., NYS Museum, 1995 these plants offer prime habitat for mature gamefish like muskies dry seed ( )! Cosewic status: None: Robbin ’ s pondweed is distinctive because of its conspicuously flattened, winged.... Identification ( gardening, invasive species Control, edible plants, etc leaves submerged, ribbon like, sided. Hilton 1983 ), ascending to spreading, stalkless, not clasping introduced intentionally... The lake, parallel sided, 2 to 3.5 mm wide, usually veined... 4-8 inches long Occurs only in wetlands long stems often form masses at the water.. ) delivers results with a scattered distribution across the northern United States Canada. Is Narrow leaf pondweed strongly flattened stems and with leaves that are about mm. Discover thousands of New England plants please click it to see who you will need to contact will!