| Iridaceae | |
Iris acaulis
| Pall. | Reise Russ. Reich. 3: 213 | 1776 |
| Iridaceae | |
Iris acleantha
| Small | Contr. New York Bot. Gard. 327: 333, 338 | 1931 |
| Iridaceae | |
Iris acoriformis
| Boreau | Fl. Centre France 2: 635 | 1857 |
| Iridaceae | |
Iris acoroides
| Spach | Hist. Nat. Vég. 13: 44 | 1846 |
| Iridaceae | |
Iris acuta
| Willd. | Enum. Pl. Suppl.: 4 | 1814 |
| Iridaceae | |
Iris acutifolia
| C.A. Mey. ex Regel | Gartenflora 23: 323 | 1874 |
| Iridaceae | |
Iris acutiloba
| C.A. Mey. | | |
| Iridaceae | |
Iris adamii
| Willd. ex Link | Jahrb. Gewächsk. 1(3): 72 | 1820 |
| Iridaceae | |
Iris adriatica
| Trinajstić ex Mitic | Phyton (Horn) 42: 307 | 2002 |
| Iridaceae | |
Iris aegyptia
| Delile | Voy. Arabie Petrée 82 | 1830 |
| Iridaceae | |
Iris aequiloba
| Ledeb. | | |
| Iridaceae | |
Iris afghanica
| Wendelbo | | |
| Iridaceae | |
Iris × agatha
| auct. | Garden (London, 1871-1927) 46: 157 | 1894 |
| Iridaceae | |
Iris aitchisonii
| (Baker) Boiss. | Fl. Orient. [Boiss.] 5: 123 | 1882 |
| Iridaceae | |
Iris alabamensis
| Small | Contr. New York Bot. Gard. 327: 336, 354 | 1931 |
| Iridaceae | |
Iris alata
| Poir. | | |
| Iridaceae | |
Iris alba
| Savi | Fl. Pis. 1: 32 | 1798 |
| Iridaceae | |
Iris alberti
| Regel | | |
| Iridaceae | |
Iris albicans
| Lange | Vidensk. Meddel. Dansk Naturhist. Foren. Kjøbenhavn 1860: 76 | 1861 |
| Iridaceae | |
Iris albida
| Davidov | Trav. Soc. Bulg. Sci. Nat. 8: 117 | 1915 |
| Iridaceae | |
Iris albilinea
| Alexander | Contr. New York Bot. Gard. 327: 335, 349 | 1931 |
| Iridaceae | |
Iris × albilinea
| Alexander | Contr. New York Bot. Gard. 327: 349 | 1931 |
| Iridaceae | |
Iris albispiritus
| Small | Addisonia 14(1): 3–4, pl. 450 | 1929 |
| Iridaceae | |
Iris albomarginata
| (B. Fedtsch.) R.C. Foster | Contr. Gray Herb. 114: 42 | 1936 |
| Iridaceae | |
Iris albopurpurea
| Baker | Bot. Mag. 122: t. 7511 | 1896 |
| Iridaceae | |
Iris alexeenkoi
| Grossh. | | |
| Iridaceae | |
Iris almaatensis
| Pavlov | Vestn. Akad. Nauk Kazakhsk. SSR 3(60): 26 | 1950 |
| Iridaceae | |
Iris alpina
| Pall. ex Roem. & Schult. | Syst. Veg. [Sprengel] 1: 476 | 1817 |
| Iridaceae | |
Iris alticristata
| Small | Contr. New York Bot. Gard. 327: 336, 353 | 1931 |
| Iridaceae | |
Iris × alticristata
| Small | Contr. New York Bot. Gard. 327: 353 | 1931 |
| Iridaceae | |
Iris × altobarbata
| A.E. Murray | Kalmia 1: 25 | 1969 |
| Iridaceae | |
Iris amabilis
| Eastw. | Bull. Torrey Bot. Club 30(9): 484–485 | 1903 |
| Iridaceae | |
Iris amasiana
| Bornm. ex Hausskn. | Flora 72: 140 | 1889 |
| Iridaceae | |
Iris amnicola
| Alexander | Contr. New York Bot. Gard. 327: 335, 348 | 1931 |
| Iridaceae | |
Iris × amnicola
| Alexander | Contr. New York Bot. Gard. 327: 348 | 1931 |
| Iridaceae | |
Iris × amoena
| DC. | Liliac. 6: t. 336 | 1811 |
| Iridaceae | |
Iris anglica
| Steud. | Nomencl. Bot. 437 | 1821 |
| Iridaceae | |
Iris anguifuga
| Y.T. Zhao & X.J. Xue | Acta Phytotax. Sin. 18(1): 56–57, pl. 1 | 1980 |
| Iridaceae | |
Iris angusta
| Thunb. | Iris 28 | 1782 |
| Iridaceae | |
Iris angustifolia
| Mill. | Gard. Dict. (ed. 8) 12 | 1768 |
| Iridaceae | ** |
Iris angustifolia
| Gilib. | Exerc. Phyt. 2: 498 | 1792 |
| Iridaceae | |
Iris annae
| Grossh. | | |
| Iridaceae | |
Iris antilibanotica
| Dinsm. | | |
| Iridaceae | |
Iris aphylla
| L. | Sp. Pl. 1: 38 | 1753 |
| Iridaceae | |
Iris arctica
| Eastw. | Bot. Gaz. 33(2): 132, f. 2 | 1902 |
| Iridaceae | |
Iris arenaria
| Waldst. & Kit. | Descr. Icon. Pl. Hung. 1: 57 | 1802 |
| Iridaceae | |
Iris argentea
| auct. | Rev. Hort. (Paris) 63: 36 | 1891 |
| Iridaceae | |
Iris arizonica
| Dykes | Gard. Chron., ser. 3 61: 45 | 1917 |
| Iridaceae | |
Iris × arnoldiana
| N. Busch ex Grossh. | Fl. Kavkaza 2: 172 | 1930 |
| Iridaceae | |
Iris aschersonii
| Foster | Garden (London, 1871-1927) 1902: 288 | 1902 |
| Iridaceae | |
Iris assadiana
| Chaudhary, G.Kirkw. & C.Weymouth | Bot. Not. 128: 401 | 1975 [1976] |
| Iridaceae | |
Iris assyriaca
| W. Irving | Garden (London, 1871-1927) 69: 195 | 1906 |
| Iridaceae | |
Iris astrachanica
| Rodion. | Dekorat. Trab. Rast. Dlya Otkr. Grunta SSSR 1: 251 | 1977 |
| Iridaceae | |
Iris athoa
| Foster | Gard. Chron. 1893(1): 711 | 1893 |
| Iridaceae | |
Iris atrocyanea
| Small | Addisonia 14: 13, pl. 455 | 1929 |
| Iridaceae | |
Iris atroenantha
| Small | Contr. New York Bot. Gard. 327: 335, 348 | 1931 |
| Iridaceae | |
Iris × atroenantha
| Small | Contr. New York Bot. Gard. 327: 348 | 1931 |
| Iridaceae | |
Iris atrofusca
| Baker | | |
| Iridaceae | |
Iris atropatana
| Grossh. | | |
| Iridaceae | |
Iris atropurpurea
| Baker | | |
| Iridaceae | |
Iris × atroviolacea
| Lange | Bot. Tidsskr. 13: 18 | 1882 |
| Iridaceae | |
Iris attica
| Boiss. & Heldr. | | |
| Iridaceae | |
Iris aucheri
| Sealy | | |
| Iridaceae | |
Iris × auralata
| Small | Contr. New York Bot. Gard. 327: 349 | 1931 |
| Iridaceae | |
Iris auralata
| Small | Contr. New York Bot. Gard. 327: 335, 349 | 1931 |
| Iridaceae | |
Iris auranitica
| Dinsm. | | |
| Iridaceae | |
Iris aurea
| Link | Enum. Pl. Hort. Berol. Alt. 1: 59 | 1821 |
| Iridaceae | * |
Iris aurea
| Lindl. | Edwards's Bot. Reg. 33: t. 59 | 1847 |
| Iridaceae | |
Iris × aureonympha
| E. English | Natl. Hort. Mag. 27: 167 | 1948 |
| Iridaceae | |
Iris aurilinea
| Alexander | Contr. New York Bot. Gard. 327: 336, 353 | 1931 |
| Iridaceae | |
Iris × australis
| Tod. | Nuov. Gen. Sp. 49 | 1861 |
| Iridaceae | |
Iris × autosyndetica
| Simonet | Compt. Rend. Hebd. Séances Acad. Sci. 198: 1173 | 1934 |
| Iridaceae | |
Iris autumnalis
| Tausch | Flora 17: 522 | 1834 |
| Iridaceae | |
Iris babadagica
| Rzazade & Golneva | | |
| Iridaceae | |
Iris bakeriana
| R.C. Foster | | |
| Iridaceae | |
Iris baldshuanica
| B. Fedtsch. | | |
| Iridaceae | |
Iris baldshuanica
| O. Fedtsch. & B. Fedtsch. | Russk. Bot. Zhurn. 1909: 77 | 1909 |
| Iridaceae | |
Iris balkana
| Janka | Magyar Tud. Akad. Értes. 12: 173 | 1874 |
| Iridaceae | |
Iris barbatula
| Noltie & K.Y. Guan | New Plantsman 2(3): 137 | 1995 |
| Iridaceae | |
Iris barnumae
| Foster & Baker | Gard. Chron. 2: 182 | 1888 |
| Iridaceae | |
Iris × barthii
| (Prodán & Buia) Prodán & Nyar. | Fl. Republ. Socialiste Romania 11: 472 | 1966 |
| Iridaceae | |
Iris × barthiiformis
| (Prodán) Prodán & Nyar. | Fl. Republ. Socialiste Romania 11: 475 | 1966 |
| Iridaceae | |
Iris bartonii
| Foster | Gard. Chron. 1883(1): 275 | 1883 |
| Iridaceae | |
Iris basaltica
| Dinsm. | | |
| Iridaceae | |
Iris bastardi
| Boreau | Fl. Centre France 2: 635 | 1857 |
| Iridaceae | |
Iris bayonnensis
| Gren. & Godr. | Fl. France 3: 243 | 1855 |
| Iridaceae | |
Iris beecheyana
| Herb. | Bot. Beechey Voy. 395 | 1841 [1840] |
| Iridaceae | |
Iris × belouinii
| Bois & Cornuault | Rev. Hort. (Paris) 87: 547 | 1915 |
| Iridaceae | |
Iris benacensis
| A. Kern. | Verh. K.K. Zool.-Bot. Ges. Wien 37: 649 | 1887 |
| Iridaceae | |
Iris bicapitata
| Colas. | | |
| Iridaceae | * |
Iris bicolor
| Lindl. | Edwards's Bot. Reg. 17: | 1831 |
| Iridaceae | |
Iris bicolor
| Mill. | Gard. Dict. (ed. 8) 13 | 1768 |
| Iridaceae | * |
Iris biflora
| Falk | Beytr. Topogr. Kenntn. Russ. Reiches 2: 101 | 1786 |
| Iridaceae | |
Iris biflora
| L. | Sp. Pl. 38 | 1753 |
| Iridaceae | |
Iris bifurca
| Steven ex Baker | J. Linn. Soc., Bot. 16: 145 | 1877 |
| Iridaceae | |
Iris bifurcata
| Small | Contr. New York Bot. Gard. 327: 334, 345 | 1931 |
| Iridaceae | |
Iris × bifurcata
| Small | Contr. New York Bot. Gard. 327: 345 | 1931 |
| Iridaceae | |
Iris biggeri
| Dinsm. | Fl. Syria ed. 2, 2: 599 | 1933 |
| Iridaceae | |
Iris biglumis
| Vahl | Enum. Pl. 3: 149 | 1806 |
| Iridaceae | |
Iris × biliottii
| Foster | Gard. Chron. 1887(1): 738 | 1887 |