One would certainly be Compositae, the daisy family. I am pretty sure Asteraceae (aster family) would be another. A guess for the third would be Poaceae (grasses)
The three largest flowering plant families containing the greatest number of species are the Sunflower Family (Asteraceae) with about 24,000 species, the Orchid Family (Orchidaceae) with about 20,000 species, and the Legume or Pea Family (Fabaceae) with 18,000 species.
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