For those interested, you can search through the collections of herbariums all over north America through portals such as the Consortium of Midwest Herbaria[0], in Europe through digHerb [1], and throughout the rest of the world through many other symbiota portals [2].
You can find your nearest brick and mortar herbarium globally through Index Herbariorum[3]. Though these resources are incomplete, they are pretty extensive regardless.
[0]https://midwestherbaria.org/portal/collections/search/index....
[1]https://digiherb.symbiota.org/
Neat to see doi implemented as intended, where identifiers link to items that not articles.
Not a very user friendly website IMHO. Surprised it doesn't list the Irish language names of many of these plants (as far as I could see).
scientifically the only names that matter are the botanic binomials (ICN or ICNafp)
https://en.wikipedia.org/wiki/International_Code_of_Nomencla...
Scientifically, communication matters. Therefore, other names do also matter.
All other names are generally considered either common or historic. Common names are regarded as too ambiguous for scientific use, they are generally only mentioned in relevance to collections such as "How do the local people in <area x> having <population y> of <latin name z> (who might help identify where it is growing) refer to the organism?". In a small number of cases local names confer ethnobotanical or cultural semantics.
Also for those in the States, contact your local state University extension office. They know of local resources like this that aren't widely advertised/don't have an online presence.