Oenothera biennis

from WordNet (r) 3.0 (2006)

Oenothera biennis
    n 1: a coarse biennial of eastern North America with yellow
         flowers that open in the evening; naturalized in Europe
         [syn: {common evening primrose}, {German rampion},
         {Oenothera biennis}]

from The Collaborative International Dictionary of English v.0.48

Rampion \Ram"pi*on\ (r[a^]m"p[i^]*[u^]n), n. [Cf. F. raiponce,
   Sp. ruiponce, reponche, L. raperonzo, NL. rapuntium, fr. L.
   rapum, rapa, a turnip, rape. Cf. {Rape} a plant.] (Bot.)
   A plant ({Campanula Rapunculus}) of the Bellflower family,
   with a tuberous esculent root; -- also called {ramps}.
   [1913 Webster]

   Note: The name is sometimes given to plants of the genus
         {Phyteuma}, herbs of the Bellflower family, and to the
         American evening primrose ({[OE]nothera biennis}),
         which has run wild in some parts of Europe.
         [1913 Webster]