Ageratum callosum S.Watson accepted as Alomia callosa (S.Watson) B.L.Rob. (original description)
Artemisia forwoodii S.Watson accepted as Artemisia campestris L. (original description)
Aster forwoodii S.Watson accepted as Eurybia conspicua (Lindl.) G.L.Nesom (original description)
Cacalia pringlei S.Watson accepted as Psacalium pringlei (S.Watson) H.Rob. & Brettell (original description)
Chrysactinia pinnata S.Watson (original description)
Chrysactinia truncata S.Watson (original description)
Cnicus pringlei S.Watson accepted as Cirsium pringlei (S.Watson) Petr. (original description)
Eremiastrum orcuttii S.Watson accepted as Monoptilon bellioides (A.Gray) H.M.Hall (original description)
Heliopsis filifolia S.Watson (original description)
Hieracium nigrocollinum S.Watson (original description)
Jaliscoa S.Watson (original description)
Jaliscoa pringlei S.Watson (original description)
Lepidospartum latisquamum S.Watson (original description)
Pectis bracteata S.Watson accepted as Leucactinia bracteata (S.Watson) Rydb. (original description)
Perezia capitata S.Watson accepted as Acourtia glomeriflora (A.Gray) Reveal & R.M.King (original description)
Perymenium album S.Watson (original description)
Senecio chapalensis S.Watson (original description)
Senecio montereyanus S.Watson (original description)
Trixis hyposericea S.Watson (original description)
Wyethia mexicana S.Watson accepted as Vigethia mexicana (S.Watson) W.A.Weber (original description)
Zaluzania resinosa S.Watson accepted as Greenmaniella resinosa (S.Watson) W.M.Sharp (original description)