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It's pretty straight forward.Goldenrod wasn't part of the two papers attached to the OP, at least with a 30% loss. I don't know how much work was done with it, but I found in a quick search one study that gives your 30%, and it was in pollen.
The newer samples look much like the older generations. But scientists testing the pollen content from goldenrod collected between 1842 and 2014, when atmospheric concentrations of carbon dioxide rose from about 280 parts per million to 398 ppm, found the most recent pollen samples contained 30 percent less protein. The greatest drop in protein occurred from 1960 to 2014, when the amount of carbon dioxide in the atmosphere rose dramatically. A field experiment in the same study that exposed goldenrod to CO2 levels ranging from 280 to 500 ppm showed similar protein decreases.
How Rising CO2 Levels May Contribute to Die-Off of Bees
So I'm curious. Where are you referencing the 30% loss from?
They found that the protein content of goldenrod pollen has declined by a third since the industrial revolution—and the change closely tracks with the rise in CO2.