Acanthambrosia Rydb. accepted as Ambrosia L. (original description)
Acanthambrosia bryantii (Curran) Rydb. accepted as Ambrosia bryantii (Curran) W.W.Payne (original description)
Ambrosia californica Rydb. accepted as Ambrosia psilostachya DC. (original description)
Ambrosia diversifolia (Piper) Rydb. (original description)
Ambrosia monophylla (Walter) Rydb. accepted as Ambrosia artemisiifolia L. (original description)
Ambrosia rugelii Rydb. accepted as Ambrosia psilostachya DC. (original description)
Centratherum violaceum (Schrank) Gleason accepted as Centratherum punctatum Cass. (original description)
Chorisiva (A.Gray) Rydb. accepted as Iva L. (original description)
Chorisiva nevadensis (M.E.Jones) Rydb. (original description)
Cyclachaena ambrosiifolia (A.Gray) Benth. & Hook.f. ex Rydb. accepted as Hedosyne ambrosiifolia (A.Gray) Strother (original description)
Cyclachaena lobata Rydb. accepted as Hedosyne ambrosiifolia (A.Gray) Strother (original description)
Cyclachaena pedicellata Rydb. accepted as Iva xanthiifolia Nutt. (original description)
Dicoria hispidula Rydb. accepted as Dicoria canescens A.Gray (original description)
Dicoria oblongifolia Rydb. (original description)
Eremosis angusta Gleason accepted as Vernonia angusta (Gleason) Standl. (original description)
Eremosis callilepis (Sch.Bip.) Gleason accepted as Critoniopsis foliosa (Benth.) H.Rob. (original description)
Eremosis littoralis Gleason (original description)
Eremosis littoralis Brandegee (original description)
Eremosis oolepis (S.F.Blake) Gleason (original description)
Franseria bipinnatifida var. villosa (Rydb.) Eastw. accepted as Ambrosia chamissonis (Less.) Greene (original description)
Franseria canescens (A.Gray) Rydb. accepted as Ambrosia canescens A.Gray (original description)
Franseria caudata Rydb. accepted as Ambrosia confertiflora DC. (original description)
Franseria confertiflora (DC.) Rydb. accepted as Ambrosia confertiflora DC. (original description)
Franseria hispidissima Rydb. accepted as Ambrosia confertiflora DC. (original description)
Franseria incana Rydb. accepted as Ambrosia confertiflora DC. (original description)
Franseria intricata Rydb. accepted as Ambrosia magdalenae (Brandegee) W.W.Payne (original description)
Franseria lancifolia Rydb. accepted as Ambrosia chenopodiifolia (Benth.) W.W.Payne (original description)
Franseria leptophylla (A.Gray) Rydb. accepted as Ambrosia camphorata (Greene) W.W.Payne (original description)
Franseria malvacea Rydb. accepted as Ambrosia cordifolia (A.Gray) W.W.Payne (original description)
Franseria palmeri Rydb. accepted as Ambrosia acanthicarpa Hook. (original description)
Franseria pringlei Rydb. accepted as Ambrosia confertiflora DC. (original description)
Franseria sanctae-gertrudis Rydb. accepted as Ambrosia carduacea (Greene) W.W.Payne (original description)
Franseria strigulosa Rydb. accepted as Ambrosia confertiflora DC. (original description)
Franseria villosa Rydb. accepted as Ambrosia chamissonis (Less.) Greene (original description)
Hymenoclea pentalepis Rydb. accepted as Ambrosia salsola var. pentalepis (Rydb.) Strother & B.G.Baldwin (original description)
Leuciva Rydb. accepted as Iva L. (original description)
Leuciva dealbata (A.Gray) Rydb. (original description)
Oliganthes ferruginea Gleason accepted as Piptocoma discolor (Kunth) Pruski accepted as Pollalesta discolor (Kunth) Aristeg. (original description)
Vernonia callilepis Gleason accepted as Lepidonia callilepis (Gleason) H.Rob. & Funk (original description)