Taraxacum sinuatum Dahlst. “Sinuate-lobed Dandelion”
Probably introduced. Almost confined to western England and Wales with a few scattered records elsewhere. Grasslands, verges, gardens etc.
T. sinuatum has bright red petioles with dentate green wings; leaves are a clear green and heterophyllous, inner leaves producing a larger, rounded to helmet-shaped end-lobe. Leaf side-lobes are strongly sigmoid on the distal margin, to double-lobed on mature leaves, but immature phenotypes have subobtuse side-lobes. Exterior bracts are short and strongly recurved and ligule stripes pinkish-grey. Compare T. obtusifrons, the closest relative.