What is "senecio vulgaris"

Groundsel \Ground"sel\, n. [OE. grundswilie, AS. grundeswylige, grundeswelge, earlier gundiswilge; gund matter, pus + swelgan to swallow. So named as being good for a running from the eye. See Swallow, v.] (Bot.) An annual composite plant ( Senecio vulgaris), one of the most common and widely distributed weeds on the globe.

Senecio vulgaris, often known by the common names groundsel and old-man-in-the-Spring, is a flowering plant in the daisy family Asteraceae. It is an annual herb, native to Europe and widely naturalised as a weed in suitable disturbed habitats worldwide.