Yarrow, Achillea millefolium , can be cut with a lawnmower and still flourish regularly. Nettles, Urtica dioca , when grown for fiber can have 3-4 above ground harvests in a growing season. Plants that fit into this category are generally perennials. You can pick them and not threaten their survival. Endangered plants are species in danger of becoming extinct in the foreseeable future.
Threatened plants are likely to become endangered in the foreseeable future.
A species can be threatened or endangered throughout its range, which means if it goes extinct we will lose its hidden secrets forever. The Columbia Gorge on the border of Oregon and Washington hosts many endemic species. Peck's Penstemon, Penstemon peckii , grows only in the Ponderosa Pine Forest in Deschutes and Jefferson Counties. A species can also receive protection for part of its range. Newberry's Gentian, Gentiana newberryi , has stable populations in California, but is listed as threatened in Oregon.