It is a hybrid between a native and a non-native introduced species, which naturalised in England but the population failed to sustain itself.

A survey by UK government advisory body Natural England found it was driven to extinction by 2000, partly due to the use of weedkiller.

[3] S. eboracensis have large many lobed leaves divided into slender segments, the clefts not reaching the midrib.

The upper and lower leaves petiolate and lobes appearing at quarter whole leaf lengths along the midrib.

The flower-head is broadly cylindrical 10×4 millimeters (0.4×0.16 in), becoming slightly bell shaped) when the bright yellow ray florets open.

[3] S. vulgaris is native to Britain, while S. squalidus was introduced from Sicily in the early 18th century;[3] therefore, S. eboracensis has speciated from those two species within the last 300 years.

hibernicus (which has been accepted as a synonym for S. vulgaris[11]), now common in Britain, and the allohexaploid S. cambrensis, which according to molecular evidence probably originated independently at least three times in different locations.