Ambrosia helenae Rouleau (original description)
Ambrosia trifida var. polyploidea J.Rousseau accepted as Ambrosia trifida L. (original description)
Artemisia borealis f. adamsii (Besser) J.Rousseau accepted as Artemisia campestris subsp. borealis var. borealis (Pall.) M.Peck (original description)
Artemisia borealis f. latisecta (Fernald) J.Rousseau accepted as Artemisia campestris subsp. borealis var. borealis (Pall.) M.Peck (original description)
Artemisia borealis f. purshii (Besser ex Hook.) J.Rousseau accepted as Artemisia campestris subsp. borealis var. borealis (Pall.) M.Peck (original description)
Artemisia borealis f. typica J.Rousseau accepted as Artemisia campestris subsp. borealis var. borealis (Pall.) M.Peck (original description)
Artemisia borealis f. wormskioldii (Besser ex Hook.) J.Rousseau accepted as Artemisia campestris subsp. borealis var. wormskioldii (Besser ex Besser) Cronquist (original description)
Artemisia canadensis f. peucedanifolia (Juss. ex Besser) J.Rousseau accepted as Artemisia campestris subsp. borealis var. borealis (Pall.) M.Peck (original description)
Artemisia canadensis f. pumila J.Rousseau accepted as Artemisia campestris subsp. borealis var. borealis (Pall.) M.Peck (original description)
Artemisia canadensis f. repustris J.Rousseau accepted as Artemisia campestris subsp. borealis var. borealis (Pall.) M.Peck (original description)
Artemisia canadensis f. typica J.Rousseau accepted as Artemisia campestris subsp. borealis var. borealis (Pall.) M.Peck (original description)
Artemisia caudata f. forwoodii (S.Watson) J.Rousseau accepted as Artemisia campestris L. (original description)
Artemisia caudata f. pubera J.Rousseau accepted as Artemisia campestris L. (original description)
Artemisia caudata f. typica J.Rousseau accepted as Artemisia campestris L. (original description)
Artemisia caudata var. majuscula J.Rousseau accepted as Artemisia campestris L. (original description)
Aster gaspensis f. albiflorus Vict. accepted as Symphyotrichum novi-belgii var. tardifolium (original description)
Aster umbellatus f. discoideus Vict. accepted as Doellingeria umbellata (Mill.) Nees (original description)
Eupatorium maculatum f. anomalum Vict. accepted as Eupatorium quaternum DC. (original description)
Hieracium canadense f. lepagei Vict. (original description)