Plant ID Please - which loosestrife?

[Marianne]

I researched this extensively but cannot be sure if this is winged loosestrife (Lythrum alatum), which is native to the Narragansett, Rhode Island coastal area where I took this photograph, or purple loosestrife (Lythrum salicaria) an invasive plant that has taken over many areas where native wildflowers grow. I've gone with Lythrum sp. to be safe, but wondering if any of you can id it? 

 

Thanks! 

 

 

http://www.alamy.com/stock-photo-loosestrife-lythrum-sp-growing-along-the-beach-in-narragansett-rhode-104265077.html?pv=1&stamp=2&imageid=33596076-EB7D-494C-B961-E17B1338E72A&p=94148&n=0&orientation=0&pn=1&searchtype=0&IsFromSearch=1&srch=foo%3dbar%26st%3d0%26pn%3d1%26ps%3d100%26sortby%3d2%26resultview%3dsortbyPopular%26npgs%3d1%26qt%3dG1HK4N%26qt_raw%3dG1HK4N%26lic%3d3%26mr%3d0%26pr%3d0%26ot%3d0%26creative%3d%26ag%3d0%26hc%3d0%26pc%3d%26blackwhite%3d%26cutout%3d%26tbar%3d1%26et%3d0x000000000000000000000%26vp%3d0%26loc%3d0%26imgt%3d0%26dtfr%3d%26dtto%3d%26size%3d0xFF%26archive%3d1%26groupid%3d%26pseudoid%3d%26a%3d%26cdid%3d%26cdsrt%3d%26name%3d%26qn%3d%26apalib%3d0%26apalic%3d%26lightbox%3d%26gname%3d%26gtype%3d%26xstx%3d0%26simid%3d%26saveQry%3d%26editorial%3d1%26nu%3d%26t%3d%26edoptin%3d%26customgeoip%3dUS%26cap%3d1%26cbstore%3d1%26vd%3d0

 

Spellcheck keeps wanting to call it Lythrum alarm!

[Allan Bell]

In my book of British and European wildflowers it certainly looks like Purple Loosestrife (Lythrum salcaria).  (Lythraceae).

 

Allan

[Marianne]

In my book of British and European wildflowers it certainly looks like Purple Loosestrife (Lythrum salcaria).  (Lythraceae).

 

Allan

 

 

Thanks, they look a lot alike. The British/European purple loosestrife  is the invasive species here. My American Botanical book has a photo of purple loosestrife and no photo of the winged loosestrife - so I've only seen the winged loosestrife in photos online.