senecio vulgaris

From The Collaborative International Dictionary of English v.0.48:

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.
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