ITIS provides access to their data via their Solr service described at https://www.itis.gov/solr_documentation.html. This is a powerful interace to ITIS data as you have access to a very flexible query interface.
Details
See solr_fields and https://www.itis.gov/solr_documentation.html for guidance on available fields.
Functions
itis_search()
- Searchitis_group()
- Groupitis_highlight()
- Highlightitis_facet()
- Facet