To my knowledge, there is no North American source for Psyllium seeds or husks, nor Dong Quai...and the only NA source for Ginkgo & Milk Thistle is Pacific Botanicals.
There are likely others I could add to this list, but those are the 'biggies'.
Of course there may be 'small suppliers' of small quantities that are grown in the US/NA, but from the three majors (Mountain Rose, Pacific Botanicals & Starwest), there are some exceptions. :(