I believe that that that wikispice page http://www.wikispice...eed-lovage.html is totally erroneous. Perhaps whoever wrote that "spice Celery Seed which is from Lovage, a false or wild celery plant" was confused by the obsolete name for celery, "smallage", or by such names as "leaf celery" or "wild celery". All of these are varieties of Apium graveolens, celery.
Hi Hank,
As you say, other than wikispice, there seems a near-consensus that "celery seed" is not produced from lovage (unless via semantic error).
Nonetheless, "celery seed" does seem to geographically occur in many "forms". It also seems to be generally claimed as specifically produced from the, seemingly still existing, ancestor plant itself, aka smallage, wild celery, etc -
https://www.garden.e...lery-seeds-come
https://www.cooksinfo.com/celery-seed
https://www.spiceogr...m/celery-seeds/
http://theepicentre..../celery-seed-2/
Just as another illustration -
Celery Seed Cultivation
Celery Seed doesn't actually come from the same celery plant that we eat.
The ancestor of celery that most of us recognize is a plant called "wild celery" or "smallage" and celery seeds come from wild celery. From Smallage, two descendants were carefully cultivated. "Stem Celery", the celery that we eat for its stalks, and "Celeriac", the celery that we eat for its roots. Wild celery does not flower its first year and produces white flowers in its second year, which then become the seeds.
Celery Seed is commercially cultivated in India, France, Britain, Japan, China, Hungary, and the United States. The seeds grown in India are stronger and larger than Chinese celery seeds, while French seeds are a bit darker.
Depending on the time of year, our organic celery seed may be cultivated in Egypt, India, the Netherlands or the US.
https://www.spicesin...lery-seeds.aspx
Based on 1st link above, the exact scientific identity of a given commercial product of "celery seed" seems open to question.
Based on above links, the appearance/flavour of "celery seeds" seems variable. It is unclear which variety is being referred to in OP (if known).
Regardless, for the specific celery seeds in the OP, should be easy to verify if the comments in Post 4 do hold. If so, substitution presumably improbable/easily detected..