UL Pearly everlasting has a poetic common name that refers to its use in dried floral arrangements. Once a popular selection in early American cottage gardens, it has since become rather obscure.

LR Eriogonum umbellatum is a species of wild buckwheat known by the common name sulphurflower buckwheat, or simply sulphur flower. It is native to western North America from California to Colorado to central Canada

UR I've seen it called Canada Goldenrod and Rocky Mountain Goldenrod. And after further Rx, it appears they are one in the same. So maybe when you're in Canada you call is Canada Goldenrod.

LR is a new one for me. Creeping Dogbane (Apocynum androsaemifolium)
Perennial wildflower with small white or pink bell shaped flowers that form long narrow seedpods in fall; extremely fragrant! blooms midsummer; prefers some moisture in spring then dry; stems contain milky sap; poisonous; forms colonies via rhizomes.