PLANTS profile: Pond water-starwort. Callitriche stagnalis is a species of aquatic plant known by the common name pond water starwort. • IPANE. Range Global/Continental Wisconsin Native Range Europe, Northern Africa, Asia1 Figure 1: U.S and Canada Distribution Map 2 Figure 2: WI Distribution Map3 Abundance/Range Widespread: Locally Abundant: Sparse: Northwest U.S. and parts of New England Shallow, slow waters4 Submersed plants. Callitriche stagnalis is widespread also throughout the rest of Britain and Ireland and occurs as a native plant in most parts of mainland Europe and in northern Africa. 1. Invasive Plant Atlas of New England. pond water-starwort (Callitriche stagnalis) yellow floating heart (Nymphoides peltata) watercress (Rorippa nasturium-aquaticum)** * Except for eradication, education or research purposes. by its nearly round fruits in outline and the broad marginal wing that extends from the apex to around the base of each mericarp. Detailed coverage of invasive species threatening livelihoods and the environment worldwide. Callitriche stagnalis is an aquatic perennial with elongate stems that can grow from 3.94-11.81 in. Get the facts at ct.gov/coronavirus. Callitriche (Starwort) is a prolific native plant of shallow water and grows most actively in the cooler months, making it very valuable to early spawning amphibians. 2013. Summary 2. Foliage Its leaves are opposite, entire and somewhat diverse in form, depending on whether they are submerged or floating. ex He- gel m, and C verna L. emend, Kutz.) Callitriche stagnalis Starwort Cardamine impatiens Cuckoo flower Centaurea maculosa Spotted knapweed Cirsium arvense Canada thistle ... Maine Natural Areas Program List of Invasive Plants Species of Maine Section 3. Invasive Species Compendium. It is by Leslie J. Mehrhoff at University of Connecticut. (1-3 dm) in length. In North America Common Starwort is an introduced species, first discovered in the New York area in 1861, and is now a nuisance invasive weed in parts of the USA and Canada.. Callitriche stagnalis is readily distinguished from other amphibious species of Calli- triche in North America (e.g., C. heterophylla Engelm. • USDA. Connecticut residents are urged to continue taking precautions to prevent the spread of COVID-19. Current Status and Distribution Callitriche stagnalis a. Department of Ecology. Plant species highly likely to be invasive, though they are currently unknown from Maine. Image 5447133 is of European waterstarwort (Callitriche stagnalis ) plant(s). Pond water-starwort. Common water-starwort (Callitriche stagnalis) is also very similar to several rare native water-starwort species (Callitriche spp.). Will root into the bottom or pots or will equally happily grow in loose patches. Sources and Credits • State of Washington. 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