Balsamorhiza silphioides Geyer ex Hook. accepted as Silphium laeve Hook. (original description)
Erigeron divergens Hook. accepted as Lachnophyllum noeanum Boiss. (original description)
Erigeron pumilus Hook. (original description)
Helianthus quinquenervis Hook. accepted as Helianthella quinquenervis (Hook.) A.Gray (original description)
Linosyris viscidiflora Hook. (original description)
Microrhynchus chilensis Hook. (original description)
Microrhynchus cynthioides Hook. (original description)
Scorzonella nutans Hook. accepted as Microseris nutans (Hook.) Sch.Bip. (original description)
Silphium laeve Hook. (original description)