lots of unidentified, thank you guys

thank you

are you sure the second picture is edible sorrel?

 

the 5th pic (yellow flower - long stem) should be the Mexican Sunflower - Thitonia Diversifolia

 

1. Looks like Cleome.

http://www.google.co.uk/images?q=cl...=UTF-8&source=og&sa=N&tab=wi&biw=1239&bih=528

2. Leaf shape is right for Oxalis. But no idea which one it is.

http://en.wikipedia.org/wiki/Oxalis

4. Looks like Euphorbia. Probably Euphorbia Myrsinites.

http://www.google.co.uk/images?q=Eu...&source=og&sa=N&hl=en&tab=wi&biw=1239&bih=528

5. Looks like one of the many Helianthus sp. Common name sun flower.
I believe the leaf shape is wrong for it to be Tithonia diversifolia

http://www.google.co.uk/images?q=he...&source=og&sa=N&hl=en&tab=wi&biw=1239&bih=528

http://www.google.co.uk/images?hl=e...=UTF-8&source=og&sa=N&tab=wi&biw=1239&bih=528

 

The last is Galinsoga.

 

#3 Bidens frondosa.
#6 Looks like an Aster (Symphyotrichum) .

 

is the 5th Helianthus tuberosus, with edible root?

 

#7 is Galinsoga parviflora, aka Gallant Soldiers; it's got edible greens.

 

Might be. Your plant has opposite leaves like H. tuberosus.
Roots would be the best way to determine the correct ID.

 

This link has a key for Helianthus at the bottom.

http://www.efloras.org/florataxon.aspx?flora_id=1&taxon_id=114871

 

last image

I havn't got any checklist of Toronto wildflowers, but the last image does not show Galinsoga parviflora. This might be shaggy soldier (Galinsoga ciliata) or some lookalike unknown to me because of its numerous spreading hairs at the stalks of the flower heads.