Resumen

MORA-OLIVO, Arturo; DANIEL, Thomas F.  y  MARTINEZ, Mahinda. First record in the Mexican flora of Hygrophila polysperma (Acanthaceae), an aquatic weed. Rev. Mex. Biodiv. [online]. 2008, vol.79, n.1, pp. 265-269. ISSN 1870-3453.

The presence in Mexico of the aquatic weed Hygrophila polysperma is reported for the fi rst time. Data regarding history in America, morphology, and distribution in Tamaulipas are provided. A key is included to distinguish this species from the Mexican native, H. costata. Finally, the threat that this introduced plant represents for artificial and natural aquatic ecosystems in Mexico is discussed.

Palabras llave : Hygrophila polysperma; aquatic weed; Tamaulipas; Mexico.