Danaus tigers, milkweeds, monarchs, wanderers , and queens , is a genus of butterflies in the tiger butterfly tribe. They are found worldwide, including North America, South America, Africa, Asia, Indonesia and Australia. For other tigers see the genus, Parantica .
Following the review of Smith et al. (2005), 12 species are provisionally accepted based on morphological, mtDNA 12S rRNA and cytochrome c  oxidase subunit I, and nuclear DNA 18S rRNA and EF1 subunit α sequence data:
Danaus affinis  (Fabricius, 1775)  – Malay tigerDanaus chrysippus  (Linnaeus, 1758)  – plain tiger, common tiger, African monarch, lesser wanderer, or African queenDanaus cleophile  (Godart, 1819)  – Jamaican monarchDanaus dorippus  (Klug, 1845)  – dorippus tiger (formerly included in D. chrysippus )Danaus eresimus  (Cramer, [1777])  – soldier or tropical queen, includes D. plexaure Danaus erippus  (Cramer, [1775])  – southern monarchDanaus genutia  (Cramer, [1779])  – common tiger, Indian monarch, or orange tigerDanaus gilippus  (Cramer, [1775])  – queenDanaus ismare  (Cramer, [1780])  – Ismare tigerDanaus melanippus  (Cramer, [1777])  – white tiger, common tiger, or eastern common tigerDanaus petilia  (Stoll, 1790)  – lesser wandererDanaus plexippus  (Linnaeus, 1758)  – monarch or wandererThis genus was formerly split into the subgenera Danaus , Salatura , and Anosia , but this arrangement has been abolished. While the first (the 2–3 monarch butterflies) and Salatura  (species ismare, genutia, affinis , and melanippus ) do indeed seem to be clades, the relationship of these to the other species, especially the puzzling D. dorippus , is not clear.
Hybridization producing fertile offspring is known to occur between some species, confounding mtDNA data; this seems to be especially true in the case of D. dorippus  (Smith et al. 2005). In addition, male-killing Spiroplasma  infection has been shown in D. chrysippus  and probably also occurs in other species (Jiggins et al. 2000); the consequences for speciation and evolution are probably similar to those observed in infection with male-killing strains of the better-researched Wolbachia  bacteria.
Phylogeny of the genus (without D. cleophile ). 
Synonyms of Danaus species and subspecies Source: The higher classification of Nymphalidae, at Nymphalidae.net 
Note: Names preceded by an equal sign ( = ) are synonyms, homonyms, rejected names, or invalid names. Synonymy, given below in abbreviated form, is from Ackery & Vane-Wright (1984). 
Tribe Danaini Boisduval, 1833
Danaus Danaida  Latreille, 1804; = Limnas  Hübner, 1806; = Danais  Latreille, 1807; = Danaus  Latreille, 1809; = Anosia  Hübner, 1816; = Festivus  Crotch, 1872; = Salatura  Moore, 1880; = Nasuma  Moore, 1883; = Tasitia  Moore, 1883; = Danaomorpha  Kremky, 1925; = Panlymnas  Bryk, 1937; = Diogas  d'Almeida, 1938)
Danaus cleophile  (Godart, 1819) ( original name = Danais cleophile  Godart, 1819)Danaus plexippus  (Linnaeus, 1758) ( original name = Papilio plexippus  Linnaeus, 1758; = misippiformis  Meuschen, 1781; = archippus  Fabricius, 1793; = menippe  Hübner, 1816; = megalippe  Hübner, 1826; = leucogyne  Butler, 1884; = fumosus  Hulstaert, 1886; = pulchra  Strecker, 1900; = nigrippus  Haensch, 1909; = americanus  Gunder, 1927; = nivosus  Gunder, 1927; = curassavicae  Fabricius, 1938; = portoriciensis  Clark, 1941; = tobagi  Clark, 1941; = disjuncta  Dufrane, 1948; = bipunctata  Dufrane, 1948; = obliterata  Dufrane, 1948)Danaus erippus  (Cramer, 1775) ( original name = Papilio erippus  Cramer, 1775 ( = larensis  Köhler, 1929; = asclepiadis  Fabricius, 1938)Danaus ismare  (Cramer, 1780) ( original name = Papilio ismare  Cramer, 1780; = ismareola  Butler, 1866; = fulvus  Ribbe, 1890; = celebensis  Rothschild, 1892; = felicia  Fruhstorfer, 1907; = goramica  Fruhstorfer, 1907; = alba  Morishita, 1981)Danaus genutia  (Cramer, 1779) ( original name = Papilio genutia  Cramer, 1779; = adnana  Swinhoe, 1917; = albipars  Talbot, 1943; = alexis  Waterhouse & Lyell, 1914; = bandjira  Martin, 1911; = bimana  Martin, 1911; = connectens  Moulton, 1921; = conspicua  Butler, 1866; = grynion  Fruhstorfer, 1907; = intensa  Moore, 1883; = intermedia  Moore, 1883; = kyllene  Fruhstorfer, 1910; = laratensis  Butler, 1883; = leucoglene  Felder & Felder, 1865; = niasicus  Fruhstorfer, 1899; = nipalensis  Moore, 1877; = partita  Fruhstorfer, 1897; = plexippus  auctt. nec Linnaeus, 1758; = sumatrana  Moore, 1883; = sumbana  Talbot, 1943; = telmissus  Fruhstorfer, 1910; = tuak  Pryer & Cator, 1894; = tychius  Fruhstorfer, 1910; = uniens  Martin, 1911; = wetterensis  Fruhstorfer, 1899; = yuchingkini  Murayama & Shimonoya, 1960 (hybrid chrysippus  x genutia , Kurosawa, 1973)Danaus affinis  (Fabricius, 1775) ( original name = Papilio affinis  Fabricius, 1775; = abigar  Eschscholtz, 1821; = adustus  Godman & Salvin, 1882; = affinoides  Fruhstorfer, 1899; = albistriga  Talbot, 1943; = albonotata  Howarth, 1962; = artenice  Cramer, 1781; = aruana  Moore, 1883; = astakos  Fruhstorfer, 1906; = batjana  Fruhstorfer, 1899; = bipuncta  Talbot, 1943; = biseriata  Butler, 1882; = bonguensis  Fruhstorfer, 1899; = cecilia  Bouganville, 1837; = chionippe  Hübner, 1823; = cometho  Godman & Salvin, 1888; = coriacea  Fruhstorfer, 1906; = decentralis  Fruhstorfer, 1899; = decipiens  Butler, 1882; = decipientis  Strand, 1914; = djampeana  Van Eecke, 1915; = fergussonia  Fruhstorfer, 1907; = ferruginea  Butler, 1876; = fuliginosa  Hagen, 1894; = fulgurata  Butler, 1866; = fuscata  Talbot, 1943; = galacterion  Fruhstorfer, 1906; = gelanor  Waterhouse & Lyell, 1914; = hegesippinus  Röber, 1891; = insolata  Butler, 1870; = jimiensis  Miller & Miller, 1978; = jobiensis  Grose-Smith, 1894; = kapaura  Talbot, 1943; = kawiensis  Fruhstorfer, 1899; = kiriwina  Fruhstorfer, 1907; = leucippis  Röber, 1891; = litoralis  Doherty, 1891; = luxurians  Fruhstorfer, 1907; = malayana  Fruhstorfer, 1899; = molyssa  Fruhstorfer, 1907; = mysolica  Moore, 1883; = mytilene  Felder & Felder, 1860; = nigrita  Moore, 1883; = nore  Swinhoe, 1917; = nubila  Butler, 1866; = obscura  Capronnier, 1886; = oesypera  Talbot, 1943; = olga  Swinhoe, 1917; = oros  Fruhstorfer, 1907; = paradoxa  Röber, 1939; = philene  Stoll 1782; = piepersi  Kalis, 1933; = pittakus  Fruhstorfer, 1907; = pleistarchus  Fruhstorfer, 1912; = pseudophilene  Fruhstorfer, 1907; = pullata  Butler, 1866; = rubrica  Fruhstorfer, 1906; = sabrona  Talbot, 1943; = sangira  Fruhstorfer, 1899; = signata  Talbot, 1943; = snelleni  Kalis, 1933; = strephon  Fruhstorfer, 1907; = subnigra  Joicey & Talbot, 1922; = subnubila  Fruhstorfer, 1907; = tambora  Fruhstorfer, 1899; = taroena  Van Eecke, 1915; = taruna  Fruhstorfer, 1899; = transfuga  Fruhstorfer, 1907; = tualana  Talbot, 1943; = vandeldeni  Kalis, 1933; = vorkeinus  Röber, 1866; = wentholti  Martin, 1914; = woodlarkiana  Fruhstorfer, 1907)Danaus melanippus  (Cramer, 1777) ( original name = Papilio melanippus  Cramer, 1777; = hegesippus  Cramer, 1777; = lotis  Cramer, 1779; = thoe  Hübner, 1816; = edmondii  Bougainville, 1837; = nesippus  C. Felder, 1862; = eurydice  Butler, 1884; = celebensis  Staudinger, 1889; = erebus , Röber, 1891 ; = haruhasa  Doherty, 1891; = pietersii  Doherty, 1891; = taimanu  Doherty, 1891; = fruhstorferi  Röber, 1897; = keteus  Hagen, 1898; = indicus  Fruhstorfer, 1899; = malossona  Fruhstorfer, 1899; = lotina  Fruhstorfer, 1904; = umbrosus  Fruhstorfer, 1906; = philozigetes  Fruhstorfer, 1907; = mezentius  Fruhstorfer, 1910; = meridionigra  Martin, 1913; = edwardi  Van Eecke, 1914; = insularis  Moulton, 1921; = albescens  Röber, 1927; = kotoshonis  Matsumara, 1929; = camorta  Evans, 1932)Danaus eresimus  (Cramer, 1777) ( original name = Papilio eresimus  Cramer, 1777; = ares  d'Almeida, 1944; = asclepidea  Fabricius, 1938; = dilucida  Forbes, 1939; = erginus  Godman & Salvin, 1897; = estevana  Talbot, 1943; = icensis  Fuchs, 1954; = montezuma  Talbot, 1943; = tethys  Forbes, 1943)Danaus plexaure  (Godart, 1819) ( original name = Danais plexaure  Godart, 1819; = brasiliensis  Capronnier, 1874)Danaus gilippus  (Cramer, 1775) ( original name = Papilio gilippus  Cramer, 1775; = berenice  Cramer, 1779; = vincedoxici  Hübner, 1816; = vincetoxici  Hübner, 1816; = cleothera  Godart, 1819; = manuja  Eschscholtz, 1821; = xanthippus  Felder & Felder, 1860; = thersippus  Bates, 1863; = jamaicensis  Bates, 1864; = strigosa  Bates, 1864; = hermippus  Felder & Felder, 1865; = nivosus  Godman & Salvin, 1897; = esperanza  Hoffman, 1924; = centralis  Joicey & Talbot, 1925; = kempfferi  Hall, 1925; = kerri  Comstock, 1925; = vincetoxici  Fabricius, 1938; = candidus  Clark, 1941; = gilippina  Hoffman, 1940; = wheeleri  Talbot, 1943; = roedingeri  Fuchs, 1954)Danaus chrysippus  (Linnaeus, 1758) ( original name = Papilio chrysippus  Linnaeus, 1758; = albinus  Lanz, 1896; = amplifascia  Talbot, 1943; = anomala  Dufrane, 1948; = asclepiadis  Gagliardi, 1811; = auriflava  Van Eecke, 1914; = axantha  Hayward, 1922; = bataviana  Moore, 1883; = bipunctata  Dufrane, 1948; = bowringi  Moore, 1883; = candidata  Hayward, 1922; = chrysipellus  Strand, 1910; = clarippus  Weymer, 1884; = completa  Dufrane, 1948; = cratippus  Felder, 1860; = deficiens  Dufrane, 1948; = duplicata  Dufrane, 1948; = duponti  Dufrane, 1948; = evanescens  Storace, 1949; = fuscippus  Van Eecke, 1915; = gelderi  Snellen, 1891; = hanoiensis  Dufrane, 1948; = hypermnestra  Stoneham, 1958; = impunctata  Dufrane, 1948; = infumata  Aurivillius, 1898; = joannisi  Dufrane, 1948; = kanariensis  Fruhstorfer, 1898; = lemeemagdalenae  Lemeé, 1950; = limbata  Matsumura, 1929; = luxurians  Dufrane, 1948; = margarita  Röber, 1926; = orientis  Aurivillius, 1909; = ornata  Dufrane, 1948; = petilia  Stoll, 1790; = praealbata  Froreich, 1928; = pseudopetilea  Kalis, 1933; = radiata  Dufrane, 1948; = reducta  Dufrane, 1948; = rubra  Van Eecke, 1915; = semialbinus  Strand, 1910; = subpurpurea  Matsumura, 1929; = subreducta  Dufrane, 1948; = vigelii  Heylaerts, 1884; = witteellus  Overlaet, 1955; = yuchingkini  Murayama & Shimonoya, 1960 (hybrid D. chrysippus  x D. genutia )
Danaus chrysippus chrysippus  (Linnaeus, 1758)Danaus chrysippus aegyptius  (Schreber, 1759) ( original name = Papilio aegyptius  Schreber, 1759; = Danaus chrysippus klugii  Butler, 1886; = Papilio alcippus  Cramer, 1777; = Danaus chrysippus liboria  Hulstaert, 1931; = Danaus chrysippus alcippoides  Moore, 1883; = Danaus chrysippus dorippus  Klug, 1845; = Danaus chrysippus transiens  Suffert, 1900)