Senecio jacobaea

A common weed found on  Brayton Barff. The daisy-like, yellow flower heads of Common Ragwort may be pretty enough to look at, but they belie the poisonous nature of this plant. Renowned as a weed of paddocks and pastures where it can be harmful to livestock, it is not usually such an issue in gardens or waste grounds. In fact, it is the food plant of the black and red Cinnabar Moth: sometimes its black- and yellow-barred caterpillars cover the plant, totally stripping the leaves. Common Ragwort flowers from June to November. Common Ragwort is a biennial, flowering in its second year. It has clusters of yellow, flattened flower heads, and leaves that are much divided, almost looking feathery.

(Common ragwort produces large numbers of seeds which are dispersed by the wind...The Weeds Act specifies five injurious weeds: common ragwort, spear thistle, creeping or field thistle , broad-leaved dock and curled dock)