Lanceolate

pointed at both ends

leaf-shape-image: 
Common Names: 
Scientific Name: 
Polygonum
Polygonum leaf, closeup
Notes: 

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

Flower Color: 
pink
Leaf Shape: 
Location Name: 
Construction site near Alewife Reservation Cambridge, MA
United States
Common Names: 
Scientific Name: 
Polygonum
Close-up photo of Polygonum flower spike.
Notes: 

I thought this might be Lady's Thumb, but not sure.

Flower Color: 
pink
Leaf Shape: 
Location Name: 
Construction site near Alewife Reservation Cambridge, MA
United States
Common Names: 
Scientific Name: 
Polygonum
Polygonum plant near construction site.
Notes: 

Similar to Lady's Thumb (also Polygonum family), except lacking triangular dark patch on leaves. Sheaths are slightly fringed. This plant also seems too tall for Lady's Thumb.

Flower Color: 
pink
Leaf Shape: 
Location Name: 
Construction site near Alewife Reservation Cambridge, MA
United States
Common Names: 
Scientific Name: 
erbena hastata
Notes: 

Near bike path in Alewife Reservation. Belmont, Massachusetts.

Flower Color: 
purple
Leaf Shape: 
Common Names: 
Scientific Name: 
Verbena hastata
Notes: 

Near path through wetlands.
Alewife Reservation bike path. Belmont, Massachusetts.

Flower Color: 
purple
Leaf Shape: 
Common Names: 
Scientific Name: 
Lobelia cardinalis
deep red cardinal flower blossems
Notes: 

Near path through wetlands.
Alwewife Reservation. Belmont, Massachusetts.

Flower Color: 
red
Leaf Shape: 
Common Names: 
Scientific Name: 
Symphylum officinale
comfrey leaf and blossoms
Notes: 

Found near a mausoleum in Cambridge's Mount Hope Cemetery. Close up of leaves and side of blossoms. Note how leaves turn into winged stem. Hairy.

Flower Color: 
blue, purple
Leaf Shape: 
Common Names: 
Scientific Name: 
Symphylum officinale
Cluster of comfrey blossoms
Notes: 

Close-up view of blossoms from comfrey plant found near a mausoleum in Mount Auburn Cemetery, Cambridge, Massachusetts. Note how leaves turn into winged stem.

Flower Color: 
blue, purple
Leaf Shape: 
Common Names: 
Scientific Name: 
Symphylum officinale
Comfrey cluster blooming in Mt Auburn Cemetery
Notes: 

Note how the leaves flow into a winged stem.

Flower Color: 
blue, purple
Leaf Shape: 
Common Names: 
Scientific Name: 
Trientalis borealis
starflower blossom and leaves
Flower Color: 
white
Leaf Shape: