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.
See solr_fields and https://www.itis.gov/solr_documentation.html for guidance on available fields.
itis_search()
- Search
itis_group()
- Group
itis_highlight()
- Highlight
itis_facet()
- Facet
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