Aditions to the weed flora of the Valley of Mexico
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.
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