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Lythrum alatum
http://www.npwrc.usgs.gov/resource/othrdata/plntguid/species/lythalat.htm
Winged Lythrum.
Lythrum lineare
http://plants.usda.gov/cgi_bin/plant_profile.cgi?symbol=LYLI2
Wand Lythrum.
Lythrum salicaria (Purple Loosestrife)
http://tncweeds.ucdavis.edu/esadocs/lythsali.html
Fact sheet from The Nature Conservancy's Wildland Invasive Species Team.
Lythrum salicaria - Purple Loosestrife
http://plants.usda.gov/cgi_bin/plant_profile.cgi?symbol=LYSA2
Profile from PLANTS database: photographs, classification, distribution in the U.S., status as a weed under state laws, and related links.
Lythrum virgatum
http://plants.usda.gov/cgi_bin/plant_profile.cgi?symbol=LYVI3
European Wand Loosestrife.
Purple Loosestrife (Lythrum salicaria)
http://www.npwrc.usgs.gov/resource/1999/loosstrf/loosstrf.htm
Documents the spread and impact of purple loosestrife in North America.
Purple Loosestrife (Lythrum salicaria)
http://www.nps.gov/plants/alien/fact/lysa1.htm
Fact sheet discusses field recognition, habitat, history of introduction and spread, biology, and control measures.