This is a very common weed of the paths and gardens but not at all easy to distinguish from its close relative C. hirsuta. The leaves look the same, the flowers look the same, both plants are very variable in height, although C flexuosa can be much taller. The distinguishing feature is the number of stamens. In C flexuosa it is usually six but can be five and in C. hirsuta it is usually four but infuriatingly, can also be five. So if you find a plant where each flower has five stamens then tough, you can't identify it. As for photos, they'll look much the same because the stamens can only be seen with a 10 x hand lens. This plant had 5 stamens on one flower and six (four big two little) on another.
Path near our house, Cheshire, 11th September 2004
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Added on September 12th 2004, amended December 27th 2004