Scorzonera scyria M.A.Gust. & Snogerup (original description)
Sonchus sect. Asperi Boulos (original description)
Sonchus sect. Brachylobi Boulos (original description)
Sonchus sect. Dregeani Boulos (original description)
Sonchus sect. Maritimi (Kirp.) Boulos (original description)
Sonchus sect. Nani Boulos (original description)
Sonchus sect. Pinnati Boulos (original description)
Sonchus sect. Pustulati Boulos (original description)
Sonchus sect. Tuberiferi Boulos (original description)
Sonchus subg. Dendrosonchus Sch.Bip. ex Boulos (original description)
Sonchus subg. Origosonchus Boulos (original description)
Sonchus wightianus subsp. wallichianus (DC.) Boulos (original description)