Polygonum (smartweed) leaf showing dark triangle patch

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Common Names: 
smartweed, lady's thumb
Scientific Name: 
Polygonum
Flower Color: 
pink
Leaf Shape: 
lanceolate
Submitted by DanFauxsmith on Friday, December 26, 2014 - 15:17.
Photographed on: 
2014-09-10T18:18:16
Notes: 

I'm not completely sure this is lady's thumb, but the dark marking on the leaves fits.

Location Name: 
Construction site near Alewife Reservation Cambridge , MA
United States
US