| Lamiaceae | |
Orthosiphon adenocaulis
| A.J. Paton & Hedge | Fl. Madagasc. 175: 132 | 1998 |
| Lamiaceae | |
Orthosiphon adornatus
| Briq. | Bot. Jahrb. Syst. 19: 176 | 1894 |
| Lamiaceae | |
Orthosiphon adscendens
| Benth. ex Sweet | Hort. Brit. ed. 2: 413 | 1830 |
| Lamiaceae | |
Orthosiphon affinis
| N.E. Br. | | |
| Lamiaceae | |
Orthosiphon albiflorus
| N.E. Br. | | |
| Lamiaceae | |
Orthosiphon allenii
| Codd | | |
| Lamiaceae | |
Orthosiphon amabilis
| Codd | | |
| Lamiaceae | |
Orthosiphon ambiguus
| Bolus | J. Linn. Soc., Bot. 18: 394 | 1881 |
| Lamiaceae | |
Orthosiphon americanus
| Harley & A.J. Paton | Kew Bull. 67(1): 46–48, fig. 1 | 2012 |
| Lamiaceae | |
Orthosiphon angolensis
| G. Taylor | J. Bot. 69(Suppl. 2): 154 | 1931 |
| Lamiaceae | |
Orthosiphon argenteus
| A.J. Paton & Hedge | Fl. Madagasc. 175: 122–123, t. 14(7–10), carte 8 | 1998 |
| Lamiaceae | |
Orthosiphon aristatus
| (Blume) Miq. | Fl. Ned. Ind. 2: 943 | 1858 |
| Lamiaceae | |
Orthosiphon asperus
| (B. Heyne ex Roth) Benth. ex Sweet | Hort. Brit. ed. 2: 413 | 1830 |
| Lamiaceae | ** |
Orthosiphon atacorensis
| A. Chev. | Explor. Bot. Afrique Occ. Franç. 1: 515 | 1920 |
| Lamiaceae | |
Orthosiphon australis
| Vatke | Linnaea 40: 179 | 1876 |
| Lamiaceae | |
Orthosiphon bartsioides
| Baker | Fl. Trop. Afr. 5: 367 | 1900 |
| Lamiaceae | |
Orthosiphon biflorus
| A.J. Paton & Hedge | Fl. Madagasc. 175: 126–127 | 1998 |
| Lamiaceae | |
Orthosiphon bigibber
| Chiov. | Racc. Bot. 102 | 1935 |
| Lamiaceae | |
Orthosiphon bodinieri
| Vaniot | Bull. Acad. Int. Géogr. Bot. 14(183): 170 | 1904 |
| Lamiaceae | |
Orthosiphon bolusii
| N.E. Br. | | |
| Lamiaceae | |
Orthosiphon brachystemon
| Deflers | Bull. Soc. Bot. France 43: 228 | 1896 |
| Lamiaceae | |
Orthosiphon bracteatus
| Wight | Icon. Pl. Ind. Orient. t. 1428 | 1849 |
| Lamiaceae | |
Orthosiphon bracteosus
| (Benth.) Baker | Fl. Trop. Afr. 5: 375 | 1900 |
| Lamiaceae | |
Orthosiphon brevicaulis
| Baker | J. Linn. Soc., Bot. 21: 433 | 1885 |
| Lamiaceae | |
Orthosiphon breviflorus
| Vatke | Linnaea 43: 88 | 1881 |
| Lamiaceae | |
Orthosiphon buchananii
| (Baker) Ashby | J. Bot. 76: 44 | 1938 |
| Lamiaceae | |
Orthosiphon bullosus
| Chiov. | Ann. Bot. (Rome) 13: 406 | 1915 |
| Lamiaceae | |
Orthosiphon buryi
| S. Moore | J. Bot. 45: 233 | 1907 |
| Lamiaceae | |
Orthosiphon calaminthoides
| Baker | Bull. Misc. Inform. Kew 1895: 225 | 1895 |
| Lamiaceae | |
Orthosiphon cameronii
| Baker | Bull. Misc. Inform. Kew 1895: 72 | 1895 |
| Lamiaceae | |
Orthosiphon canescens
| Gürke | | |
| Lamiaceae | |
Orthosiphon capitatus
| Benth. | Labiat. Gen. Spec. 29 | 1832 |
| Lamiaceae | |
Orthosiphon chevalieri
| Briq. | Bull. Soc. Bot. France 61(8): 284 | 1914 [1917] |
| Lamiaceae | |
Orthosiphon cladotrichos
| Gürke | Pflanzenw. Ost-Afrikas C: 349 | 1895 |
| Lamiaceae | |
Orthosiphon cleistocalyx
| Vatke | Linnaea 37: 317 | 1871-1873 [1872] |
| Lamiaceae | |
Orthosiphon coloratus
| Vatke | Linnaea 43: 86 | 1881 |
| Lamiaceae | ! |
Orthosiphon comosus
| Wight ex Benth. | Prodr. 12: 52 | 1848 |
| Lamiaceae | * |
Orthosiphon comosus
| Baker | Bull. Misc. Inform. Kew 1895: 184 | 1895 |
| Lamiaceae | |
Orthosiphon cuanzae
| (I.M. Johnst.) A.J. Paton | Kew Bull. 50(1): 149 | 1995 |
| Lamiaceae | |
Orthosiphon debilis
| Hemsl. | J. Linn. Soc., Bot. 26(175): 267–268 | 1890 |
| Lamiaceae | |
Orthosiphon decipiens
| N.E. Br. | | |
| Lamiaceae | |
Orthosiphon degasparisianum
| Buscal. & Muschl. | Bot. Jahrb. Syst. 49: 490 | 1913 |
| Lamiaceae | |
Orthosiphon delavayi
| H. Lév. | Repert. Spec. Nov. Regni Veg. 9(208–210): 218 | 1911 |
| Lamiaceae | |
Orthosiphon depauperatus
| A. Terracc. | Boll. Soc. Bot. Ital. 1892: 424 | 1892 |
| Lamiaceae | |
Orthosiphon diffusus
| Benth. | | |
| Lamiaceae | |
Orthosiphon discolor
| A.J. Paton & Hedge | Fl. Madagasc. 175: 129–130 | 1998 |
| Lamiaceae | |
Orthosiphon dissimilis
| N.E. Br. | Bull. Misc. Inform. Kew 1906: 166 | 1906 |
| Lamiaceae | |
Orthosiphon dissitifolius
| Baker | Fl. Trop. Afr. 5: 371 | 1900 |
| Lamiaceae | |
Orthosiphon ehrenbergii
| Vatke | Linnaea 37: 316 | 1871-1873 [1872] |
| Lamiaceae | |
Orthosiphon ellenbeckii
| Gürke | Bot. Jahrb. Syst. 38: 174 | 1906 |
| Lamiaceae | |
Orthosiphon elliottii
| Baker | | |
| Lamiaceae | |
Orthosiphon ellipticus
| A.J. Paton & Hedge | Fl. Madagasc. 175: 127–128, t. 12(7) | 1998 |
| Lamiaceae | |
Orthosiphon emirnensis
| Baker | J. Linn. Soc., Bot. 21: 433 | 1885 |
| Lamiaceae | |
Orthosiphon engleri
| Perkins | | |
| Lamiaceae | |
Orthosiphon exilis
| A.J. Paton & Hedge | Fl. Madagasc. 175: 131, t. 15(2–7) | 1998 |
| Lamiaceae | |
Orthosiphon ferrugineus
| Balf. f. | Proc. Roy. Soc. Edinburgh 12: 91 | 1884 |
| Lamiaceae | |
Orthosiphon foliosus
| N.E. Br. | | |
| Lamiaceae | |
Orthosiphon fruticosus
| Codd | | |
| Lamiaceae | |
Orthosiphon gerrardii
| N.E. Br. | | |
| Lamiaceae | * |
Orthosiphon glabratum
| Benth. | | |
| Lamiaceae | ! |
Orthosiphon glabratus
| Benth. | Pl. Asiat. Rar. 2: 14 | 1830 |
| Lamiaceae | |
Orthosiphon glabrescens
| Vaniot | Bull. Acad. Int. Géogr. Bot. 14(183): 168–169 | 1904 |
| Lamiaceae | |
Orthosiphon glandulosus
| C.E.C. Fisch. | Bull. Misc. Inform. Kew 1930: 240 | 1930 |
| Lamiaceae | |
Orthosiphon glutinosus
| Chiov. | Res. Sci. Somal. Ital. 1: 145: | 1916 |
| Lamiaceae | |
Orthosiphon gofensis
| S. Moore | J. Bot. 1901: 263 | 1901 |
| Lamiaceae | * |
Orthosiphon grandiflorus
| Bold. | Zakfl. Java 110 | 1916 |
| Lamiaceae | |
Orthosiphon grandiflorus
| Terracciano | Boll. Soc. Bot. Ital. 1892: 424 | 1892 |
| Lamiaceae | |
Orthosiphon hanningtonii
| (Baker) A.J. Paton | Grana 31(3): 162 | 1992 |
| Lamiaceae | |
Orthosiphon helenae
| Buscal. & Muschl. | Bot. Jahrb. Syst. 49: 490 | 1913 |
| Lamiaceae | |
Orthosiphon heterochrous
| Briq. | Bot. Jahrb. Syst. 19: 173 | 1894 |
| Lamiaceae | |
Orthosiphon heterophyllus
| Gürke | Bot. Jahrb. Syst. 26: 82 | 1898 |
| Lamiaceae | * |
Orthosiphon hildebrandtii
| Baker | Fl. Trop. Afr. 5: 372 | 1900 |
| Lamiaceae | |
Orthosiphon hildebrandtii
| Vatke | Abh. Naturwiss. Vereins Bremen 9: 134 | 1885 |
| Lamiaceae | |
Orthosiphon hispidus
| Benth. | Prodr. 12: 50 | 1848 |
| Lamiaceae | |
Orthosiphon hockii
| De Wild. | Contr. Fl. Katanga 181 | 1921 |
| Lamiaceae | |
Orthosiphon holubii
| N.E. Br. | | |
| Lamiaceae | |
Orthosiphon homblei
| De Wild. | Contr. Fl. Katanga 182 | 1921 |
| Lamiaceae | |
Orthosiphon humbertii
| Danguy | Bull. Mus. Natl. Hist. Nat. 32: 304 | 1926 |
| Lamiaceae | |
Orthosiphon humilis
| N.E. Br. | Fl. Cap. 5(1): 259 | 1910 |
| Lamiaceae | |
Orthosiphon incisus
| A. Chev. | Mém. Soc. Bot. France 2 (8): 199 | 1912 |
| Lamiaceae | |
Orthosiphon inconcinnus
| Briq. | | |
| Lamiaceae | |
Orthosiphon incurvus
| Benth. | Pl. Asiat. Rar. 2: 15 | 1830 |
| Lamiaceae | |
Orthosiphon inodorus
| K.D. Koenig ex Hook. f. | Fl. Brit. India 4: 613 | 1885 |
| Lamiaceae | |
Orthosiphon iodocalyx
| Briq. | Bot. Jahrb. Syst. 19: 174 | 1894 |
| Lamiaceae | |
Orthosiphon johnstonii
| Baker | Fl. Trop. Afr. 5: 373 | 1900 |
| Lamiaceae | |
Orthosiphon kelleri
| Briq. | Bull. Herb. Boissier, sér. 2, 3: 988 | 1903 |
| Lamiaceae | |
Orthosiphon kirkii
| Baker | Fl. Trop. Afr. 5: 376 | 1900 |
| Lamiaceae | |
Orthosiphon labiatus
| N.E. Br. | | |
| Lamiaceae | * |
Orthosiphon lanatus
| Doan | Fl. Indo-Chine 4: 936 | 1936 |
| Lamiaceae | |
Orthosiphon lanatus
| Doan ex Suddee & A.J. Paton | Kew Bull. 60: 16 | 2005 |
| Lamiaceae | |
Orthosiphon lanceolatus
| Gürke | Kunene-Sambesi Exped. 360 | 1903 |
| Lamiaceae | |
Orthosiphon lanceolatus
| Y.Z. Sun | Acta Phytotax. Sin. 11(1): 56, pl. 7, f. 45–48 | 1966 |
| Lamiaceae | |
Orthosiphon latidens
| N.E. Br. | | |
| Lamiaceae | |
Orthosiphon laurentii
| De Wild. | Bol. Soc. Iber. Ci. Nat. 19: 128 | 1920 |
| Lamiaceae | |
Orthosiphon liebrechtsiauum
| Briq. | Bull. Soc. Roy. Bot. Belgique 37: 84 | 1899 |
| Lamiaceae | |
Orthosiphon linearis
| Benth. | | |
| Lamiaceae | |
Orthosiphon longipes
| Baker | Fl. Trop. Afr. 5: 373 | 1900 |
| Lamiaceae | |
Orthosiphon macranthus
| Gürke | | |
| Lamiaceae | |
Orthosiphon macrocheilus
| Ashby | J. Bot. 76: 45 | 1938 |
| Lamiaceae | |
Orthosiphon macrophyllus
| N.E. Br. | | |