Top Mile-a-Minute Look Alikes 
Click the Latin name for a slide with photos (please be patient these are large files and may take some time to open):

Polygonum arifolium:
 halberd-leaved tear-thumb, halbert-leaved tear-thumb, hastate knotgrass, sickle grass, tearthumb.

Links with more information:
http://ct-botanical-society.org/galleries/polygonumarif.html
http://www.botany.wisc.edu/wisflora/scripts/detail.asp?SpCode=POLARI
http://plants.usda.gov/java/profile?symbol=POAR6

Polygonum sagittatum:  arrowleaved tearthumb, arrowleaf tearthumb, arrow tearthumb

Links with more information:
http://ct-botanical-society.org/galleries/polygonumsagi.html
http://www.botany.wisc.edu/wisflora/scripts/detail.asp?SpCode=POLSAG
http://plants.usda.gov/java/profile?symbol=POSA5

Polygonum convulvulus:
 black bindweed, bedwine, bunwede, climbing buckwheat, devil’s tether, wild buckwheat

Links with more information:
http://wisplants.uwsp.edu/scripts/detail.asp?SpCode=POLCON
http://plants.usda.gov/java/profile?symbol=POCO10
http://www.agf.gov.bc.ca/cropprot/weedguid/buckwht.htm

Polygonum scandens:
climbing false buckwheat, 
Climbing Buckwheat

Links with more information:
http://www.missouriplants.com/Whitealt/Polygonum_scandens_page.html
http://www.illinoiswildflowers.info/savanna/plants/cl_buckwheat.htm
http://www.nearctica.com/flowers/otos/polygon/polyg2/Pscand.htm