Yellow characteristic flower head. Flower closes when pollinated, then produces the grey seed head with floating seed cases. Distinguishable from teh very similar furry cats ear because of the leaf shape, which resembles the tooth line of a lions mouth, leaves are also smooth and not furry like furry cats ear. Also, furry cats ear has a much more wirey feeling stem, unlike the hollow and more brittle dandelion stem. both produce the bright yello flowers.
If you think this observation is inaccurate, please add an ID, participate in the quality assessment above, or describe the inaccuracy in a comment.