| Summary: | The aquatic vascular flora and the vegetation of rivers, temporary ponds, dams and ditches of selected localities of the state of Querétaro, Mexico are studied. Several places are heavily infested with water hyacinth (Eichhornia crassipes) and Lemna spp. The highest floristic diversity was found in the temporary ponds of the region of Amealco and Huimilpan where 33 species of aquatic and subaquatic vascular plants were recorded. A total of 118 species of 65 genera and 43 families of pteridophytes, gymnosperms, and angiosperms were found, 19 of which are new state records for Querétaro.
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