<i>Youngia japonica</i> (Asteraceae, Lactuceae), una novedad para la Flora adventicia de Argentina

Youngia japonica (Asteraceae, Lactuceae), a novelty for the adventitious Flora of Argentina. The presence of Youngia japonica, a weed native of Southeastern Asia, is reported for the first time in Argentina. It was observed as ruderal and invading gardens in Tucumán and Entre Ríos provinces. The arrival of the species to this country is estimated as recent. A description and illustration of the plant are given.