But this plant is doubtless a native of a hotter country than North Germany.
St.John's-wort (Hypericum perforatum) is an intrusive weed in all hilly pastures, etc., and may fairly be called a social plant.

In Germany it is not so found, fide Engelmann.
Verbascum Thapsus is diffused over all the country, is vastly more common here than in Germany, fide Engelmann.
I suppose Erodium cicutarium was brought to America with cattle from Spain: it seems to be widely spread over South America out of the Tropics.

In Atlantic U.S.it is very scarce and local.

But it fills California and the interior of Oregon quite back to the west slope of the Rocky Mountains.

Fremont mentions it as the first spring food for his cattle when he reached the western side of the Rocky Mountains.