Antennaria hendersonii Piper accepted as Antennaria rosea subsp. rosea Greene (original description)
Antennaria leucophaea Piper accepted as Antennaria stenophylla (A.Gray) A.Gray (original description)
Aster diabolicus Piper accepted as Symphyotrichum foliaceum var. parryi (D.C.Eaton) G.L.Nesom (original description)
Aster elmeri Piper accepted as Aster okanoganus Piper (original description)
Aster glossophyllus Piper accepted as Dieteria canescens var. canescens (Pursh) Nutt. (original description)
Aster vaccinus Piper (original description)
Aster wattii Piper (original description)
Gnaphalium exilifolium A.Nelson (original description)
Sonchus brevipes Rydb. (original description)
Sonchus californica Rydb. (original description)