Plectronia hispida [family RUBIACEAE], sensu K. Schum. in Engler, Pflanzenw. Ost-Afrikas C: 386 (1895), pro parte, non (Benth.) K. Schum.
Plectronia gueinzii Sond. Sim [family RUBIACEAE], For. Fl. Col. Cape Good Hope: 241 (1907). —Eyles in Trans. Roy. Soc. South Africa 5: 493 (1916). —Bews, Fl. Natal & Zululand: 198 (1921).
Plectronia charadrophila K. Krause [family RUBIACEAE], in Bot. Jahrb. Syst. 57: 36 (1920). Type from Tanzania.
Plectronia subcordatifolia De Wild. [family RUBIACEAE], Pl. Bequaert. 3: 199 (1925). Type from Zaire (Dem. Rep. Congo).
Keetia transvaalensis E. Phillips [family RUBIACEAE], in Bothalia 2: 239 (1927), pro parte. Type from South Africa.
Canthium scabrosum Bullock [family RUBIACEAE], in Bull. Misc. Inform., Kew 1932: 367 (1932). —Brenan, Check-list For. Trees Shrubs Tang. Terr.: 486 (1949). Type from Uganda.
Canthium charadrophilum K. Krause Bullock [family RUBIACEAE], in Bull. Misc. Inform., Kew 1932: 369 (1932).
Canthium sylvaticum [family RUBIACEAE], sensu Bullock in Bull. Misc. Inform., Kew 1932: 369 (1932), pro parte. —sensu Brenan, Check-list For. Trees Shrubs Tang. Terr.: 486 (1949), pro parte, non Hiern.
Keetia gueinzii von Breitenbach [family RUBIACEAE], in J. Dendrol. 5: 90, fig. on p. 91 (1985), nom invalid.
Keetia gueinzii Sond. Bridson [family RUBIACEAE], in Kew Bull. 41: 970, fig. 1 A–C (1986). —K. Coates Palgrave, Trees Southern Africa, ed. 3, rev.: 16k of appendix (1988). —Bridson in F.T.E.A., Rubiaceae: 911, figs. 131/16, 25; 132/25 & 162 (1991). —Pooley, Trees of Natal, Zululand & Transkei: 478, figs. (1993). —Beentje, Kenya Trees, Shrubs Lianas: 517 (1994). TAB. 47/B3 & 72. Type from South Africa.
Canthium gueinzii Sond. [family RUBIACEAE], in Linnaea 23: 54 (1850); in F.C. 3: 16 (1865). —S. Moore in J. Linn. Soc., Bot. 40: 89 (1911). —Bullock in Hooker’s Icon. Pl. ser. 5, 2: t. 3170 (1932); in Bull. Misc. Inform., Kew 1932: 368 (1932). —Brenan, Check-list For. Trees Shrubs Tang. Terr.: 487 (1949); in Mem. N.Y. Bot. Gard. 8: 452 (1954). —Dale & Greenway, Kenya Trees & Shrubs: 428 (1961). —F. White, F.F.N.R.: 403, fig. 68, I (1962). —Palmer & Pitman, Trees Southern Africa 3: 2093 (1973). —Ross, Fl. Natal: 335 (1973). —Drummond in Kirkia 10: 276 (1975). —Gibson, Wild Fls. Natal: 6, pl. 102 (1975). —Compton, Fl. Swaziland [J. S. African Bot., Suppl. 11]: 580 (1976). —Moll, Trees of Natal: 263 & 247 (1981). —A.E. Gonçalves in Garcia de Orta, Sér. Bot. 5: 187 (1982). —Bridson & Troupin in Fl. Pl. Lign. Rwanda: 548, fig. 183.1 (1982); in Fl. Rwanda 3: 148, fig. 45.1 (1985). —K. Coates Palgrave, Trees Southern Africa, ed. 3, rev.: 881 (1988).
Canthium hispidum [family RUBIACEAE], sensu Hiern in F.T.A. 3: 140 (1877), pro parte, quoad Soyaux 196; Cat. Afr. Pl. Welw. 1: 476 (1898). —sensu Bullock in Bull. Misc. Inform., Kew 1932: 369 (1932). —sensu Brenan, Check-list For. Trees Shrubs Tang. Terr.: 486 (1949). —sensu Dale & Greenway, Kenya Trees & Shrubs: 429 (1961), non Benth.