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Alisma - unidentified species photograph
http://www.for.nau.edu/azproject/Species/ali_sp0.html
Alisma lanceolatum
http://www.dipbot.unict.it/orto/0374-1.html
Image of this species.
Alisma plantago-aquatica
http://plants.usda.gov/cgi_bin/plant_profile.cgi?symbol=ALPL
Images and brief text.
Alisma subcordatum
http://www.ppws.vt.edu/scott/weed_id/alisu.htm
Identification and images of American Water Plantain.
Alisma subcordatum
http://www.npwrc.usgs.gov/resource/1999/neflor/species/4/alissubc.htm
Images, description, and US range for Subcordate Water-plantain.
Alisma triviale (Large-Flowered Water Plantain)
http://www.illinoiswildflowers.info/wetland/plants/water_plantain.htm
Photo, physical description, range, habitat, and faunal associations.