Stellaria media

from WordNet (r) 3.0 (2006)

Stellaria media
    n 1: a common low-growing annual garden weed with small white
         flowers; cosmopolitan; so-called because it is eaten by
         chickens [syn: {common chickweed}, {Stellaria media}]

from The Collaborative International Dictionary of English v.0.48

Chickweed \Chick"weed`\ (-w[=e]d`), n. (Bot.)
   The name of several caryophyllaceous weeds, especially
   {Stellaria media}, the seeds and flower buds of which are a
   favorite food of small birds.
   [1913 Webster]

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