LAUNAEA rarifolia (Oliv. & Hiern) Boulos [family COMPOSITAE], in Bot. Notis. 115: 59 (1962); C. Jeffrey in K.B. 18: 464 (1966); Lawalrée, Dethier & Gilissen in F.A.C. Compositae: Cichorioideae: 16 (1986); G.V. Pope in F.Z. 6: 215, t. 40a (1992); N. Kilian in Englera 17: 114 (1997). Types: Malawi, Zomba and E end of Lake Shirwa, Meller (K!, syn.) & Nigeria, Nupe, Barter 1224 (K!, syn.)
Sonchus rarifolius Oliv. & Hiern [family COMPOSITAE], in F.T.A. 3: 460 (1877); R.E. Fr. in Acta Horti Berg. 8: 113 (1924); C.D. Adams in F.W.T.A. ed. 2, 2: 296 (1963)
Lactuca welwitschii Scott Elliot [family COMPOSITAE], in J.L.S. 29: 30 (1891). Types: Angola, Welwitsch 3662 (K!, syn.); Madagascar, Tolanaro [Fort Dauphin], Scott Elliot 2712 (BM!, K!, syn.)
Sonchus fischeri O. Hoffm. [family COMPOSITAE], in P.O.A. C: 421 (1895); R.E. Fr. in Acta Horti Berg. 8: 114 (1924). Type: Tanzania, Shinyanga District, Usule [Usula], Usiha, Fischer 358 (B†, holo.)
Lactuca verdickii De Wild. [family COMPOSITAE], in Ann. Mus. Congo, Bot., sér. 4, 1: 170, t. 28 (1903). Type: Congo (Kinshasa), Katanga, Lukafu, Verdick 139 (BR!, holo.)
Sonchus verdickii (De Wild.) R.E. Fr. [family COMPOSITAE], in Acta Horti Berg. 8: 113 (1924)
Sonchus welwitschii (Scott Elliot) S. Moore [family COMPOSITAE], in J.B. 65, suppl. 2: 67 (1927); F.P.S. 3: 51 (1956)
Launaea fischeri (O. Hoffm.) Boulos [family COMPOSITAE], in Bot. Notis. 115: 58 (1962)