4 more seedlings found. the second one, i have seen about 100 or more(!) in clusters of around 10-15 in each area), nightmare. the second pic is blurred, on the main pic its the the one bottom right.
by the way, im sure the left bottom one is horsetail, correct if wrong ... ?
Think you're right about the horsetail djjjuk, And it's probably a wild geum, wood avens perhaps, with it. Seeds stick to anything and spread like mad. and an annual euphorbia. Milkweed?
The other link is too out of focus to see.