If you use FloraIberica, please cite both the data source and the
package as:

  Ramos-Gutiérrez I., Lima H., Pajarón S., Romero-Zarco C., Sáez L.,
  Pataro L., Molina-Venegas R., Rodríguez M. Á. & Moreno-Saiz J. C.
  (2021). Atlas of the vascular flora of the Iberian Peninsula
  biodiversity hotspot (AFLIBER). Global Ecology and Biogeography, 30,
  1951– 1957. https://doi.org/10.1111/geb.13363

A BibTeX entry for LaTeX users is

  @Article{,
    title = {Atlas of the vascular flora of the Iberian Peninsula biodiversity hotspot (AFLIBER)},
    author = {{Ramos‐Gutiérrez} and {Ignacio} and {Lima} and {Herlander} and {Pajarón} and {Santiago} and {Romero‐Zarco} and {Carlos} and {Sáez} and {Llorenç} and {Pataro} and {Luciano} and {Molina‐Venegas} and {Rafael} and {Rodríguez} and Miguel Á. and {Moreno‐Saiz} and Juan Carlos},
    journal = {Global Ecology and Biogeography},
    year = {2021},
    volume = {30},
    pages = {1951--1957},
    url = {https://doi.org/10.1111/geb.13363},
  }

  Rodríguez-Sánchez Francisco. 2023. FloraIberica: Taxonomic and
  distribution data for the vascular plants of the Iberian Peninsula
  and Balearic Islands. https://pakillo.github.io/FloraIberica

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {FloraIberica: Taxonomic and distribution data for the vascular plants of the Iberian Peninsula and Balearic Islands},
    author = {Francisco Rodríguez-Sánchez},
    year = {2023},
    url = {https://pakillo.github.io/FloraIberica},
  }