Senecio brassica subsp. brassiciformis (R.E.Fr. & T.C.E.Fr.) Mabb. accepted as Dendrosenecio brassiciformis (R.E.Fr. & T.C.E.Fr.) Mabb. (original description)
Senecio johnstonii subsp. barbatipes (Hedberg) Mabb. accepted as Dendrosenecio elgonensis subsp. barbatipes (Hedberg) E.B.Knox (original description)
Senecio johnstonii subsp. battiscombei (R.E.Fr. & T.C.E.Fr.) Mabb. accepted as Dendrosenecio battiscombei (R.E.Fr. & T.C.E.Fr.) E.B.Knox (original description)
Senecio johnstonii subsp. cheranganiensis (Cotton & Blakelock) Mabb. accepted as Senecio johnstonii var. cheranganiensis C.Jeffrey (original description)
Senecio johnstonii subsp. cottonii (Hutch. & Taylor) Mabb. accepted as Dendrosenecio kilimanjari subsp. cottonii (Hutch. & G.Taylor) E.B.Knox (original description)
Senecio johnstonii subsp. dalei (Cotton & Blakelock) Mabb. accepted as Dendrosenecio cheranganiensis subsp. dalei (Cotton & Blakelock) E.B.Knox (original description)
Senecio johnstonii subsp. elgonensis (T.C.E.Fr.) Mabb. accepted as Dendrosenecio elgonensis subsp. elgonensis (original description)
Senecio johnstonii subsp. refractisquamatus (De Wild.) Mabb. accepted as Dendrosenecio adnivalis var. adnivalis (original description)
Senecio johnstonii var. friesiorum (Mildbr.) Mabb. accepted as Dendrosenecio adnivalis subsp. friesiorum (Mildbr.) E.B.Knox (original description)