In your examples, would the edges be like:

tagged_with_italian_tag vs. tagged_with_spanish_tag ?

tagged_with_genus_tag vs. tagged_with_geo_tag ?

Would that afford such multiple graphs?

There are a bunch of ways to do it. You could use the Entity-Attribute-Value[0]. Then it's (California Quail, Region, California), (California Quail, Genus, Callipepla). You could do relational tables, with a through table for each taxonomy. Or, one through table with tags. That's like your comment.

https://en.wikipedia.org/wiki/Entity%E2%80%93attribute%E2%80...