Aditions to the weed flora of the Valley of Mexico

Abstract

The presence of two genera represented by three species, is reported for the first time in the Valley of Mexico: Kickxia elatine ssp. crinita (Scrophulariaceae), Lamium amplexicaule and L . purpureum (Labiatae). Descriptions and keys to distinguish these plants from related taxa are provided. Additional data concerning Polygonium convolvulus (Polygonaceae), a weed recently detected, are included.