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   Egeria densa aquatic plant
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    Elodea canadensis
    Almindelig vandpest (Danish), American elodea, American elodea (United States), American elodea (English), American waterweed (Germany), anacharis (English), brede waterpest (Dutch), broad waterweed (English-United States), Canada waterweed (United States), Canadian pondweed (United States), Canadian pondweed (English), Canadian water pest (United States), Canadian waterweed (English-United States), common waterweed (United States), ditch moss (English), elodee du Canada (French), elodeja (Latvian), gemeine wasserpest (German), Kanada vesihain (Estonian), Kanada vesikatk (Estonian), Kanadan vesirutto (Finnish), Kanadese waterpes (Afrikaans), Kanadine elodeja (Lithuanian), Kanadische wasserpest (German), Moczarka kanadyjska (Polish), oxygen weed (United States), Peste d'aqua comune (Italian), peste d'eau (French), Vandpest, vandpest (Danish), vanlig vattenpest (Swedish), Vasspest (Norwegian), Vattenpest (Swedish), vesirutto (Finnish), water-thyme (United States)

    Canadian waterweed (Photo: Christian Fischer, www.commons.wikimedia.org) - Click for full size Elodea canadensis leaf (Photo: Kristian Peters, www.commons.wikimedia.org) - Click for full size Elodea canadensis (Photo: Manuel Anastácio, www.commons.wikimedia.org) - Click for full size

    The Washington State Department of Ecology (2003) states that, "Elodea canadensis is smaller than E. densa and generally has three leaves per whorl (E. densa typically has 4). Each leaf is usually less than 1 cm long.
    Hydrilla verticillata
    Florida elodea (English), hydrilla (English), oxygen weed (English), water thyme (English), water weed (English)

    Hydrilla verticillata in Lake Tutira, NZ (Photo: R. Wells, NIWA) - Click for full size Hydrilla community (Photo: John Clayton, NIWA) - Click for full size Hydrilla signage in Hawkes Bay, NZ (Photo: John Clayton, NIWA) - Click for full size Hydrilla verticillata turions (green) and tubers (Photo: Visual Arts, MAFTech) - Click for full size Hydrilla tubers and turions with scale (Photo: Visual Arts, MAFTech) - Click for full size

    The Washington State Department of Ecology (2003) states that, "Hydrilla verticillata has five leaves per whorl (E. densa typically has 4) and tiny spines along the leaf margins. The midrib of each leaf is often reddish. Hydrilla produces tubers (E. densa does not produce tubers)."

ISSG Landcare Research NBII IUCN University of Auckland