Classification by G.H.M. Lawrence (1959):

 

I.  Subgenus Iris (the bearded irises)
      A.  Section Iris (the eupogons, or pogons)
          1.  Subsection Miniature Dwarf Bearded (MDB) <8"
          2.  Subsection Standard Dwarf Bearded (SDB)   8-15"
          3.  Subsection Intermediate Bearded (IB)     16-27"
          4.  Subsection Miniature Tall Bearded (MTB)  16-27"
          5.  Subsection Border Bearded (BB)           16-27"
          6.  Subsection Tall Bearded (TB)               >27"
      B.  Section Psammiris
      C.  Section Oncocyclus
      D.  Section Regelia
      E.  Section Hexapogon
      F.  Section Pseudoregelia
  II. Subgenus Limniris (the beardless irises)
      A.  Section Lophiris (the evansia, or crested irises)
      B.  Section Limniris
              a.  Series Sibiricae (SIB)
                  (1)  Subseries Sibiricae
                  (2)  Subseries Chrysographes
              b.  Series Tenuifoliae
              c.  Series Californicae (the Pacific Coasts, PCI)
              d.  Series Syriacae
              e.  Series Chinensis
              f.  Series Ruthenicae
              g.  Series Unguiculares
              h.  Series Spuriae (SPU)
              i.  Series Foetidissimae (the "Roast Beef" iris)
              j.  Series Laevigatae (incl. Versicolors, Virginica, JI, 
                                                     Pseudacorus)
              k.  Series Prismaticae
              l.  Series Hexagonae (the Louisianas, LI)
              m.  Series Ensatae (Lactea)
              n.  Series Longipetalae (the Rocky Mountain iris)
              o.  Series Tripetalae (including setosa)
              p.  Series Vernae
III.  Subgenus Nepalensis
 IV.  Subgenus Xiphium (Dutch, Spanish, English)
  V.  Subgenus Scorpiris (the Junos)
 VI.  Subgenus Hermodactyloides (the reticulatas)

 

 

 

Classification by G.I.Rodioněnko (1961):

 

Genus Iris 
        subgenus Limniris (beardless irises) 
               section Limniris 
                       subsection Apogon 
                               series Sibiricae (Siberian irises) 
                               series Prismaticae (I. prismatica) 
                               series Laevigatae (includes Japanese irises) 
                               series Chinensis 
                               series Californicae (Pacific Coast irises) 
                               series Hexagonae (Louisiana irises) 
                               series Longipetalae (Rocky Mountain iris) 
                               series Tripetalae 
                               series Vernae (I. verna) 
                       subsection Ensatae (I. biglumis) 
                       subsection Tenuifoliae 
                               series Tenuifoliae 
                               series Ventricosae 
                       subsection Syriacae (I. grant-duffii) 
               section Unguiculares 
                               series Unguiculares 
               section Ioniris 
                               series Ruthenicae 
        subgenus Xyridion 
               section Xyridion (Spuria irises) 
                               series Spuriae 
                               series Gramineae 
               section Spathula (I. foetidissima, Gladwin) 
        subgenus Nepalensis (I. nepalensis) 
        subgenus Crossiris (Crested or Evansia irises) 
               section Crossiris 
                               series Japonicae 
                               series Tectores 
               section Lophiris 
                               series Cristatae 
               section Monospatha 
        subgenus Iris (bearded irises) 
               section Iris (eupogons, the true bearded irises) 
                               series Pumilae (smaller bearded irises) 
                               series Elatae (larger bearded irises) 
               section Hexapogon (Aril irises) 
                       subsection Regelia 
                       subsection Pseudoregelia 
                       subsection Oncocyclus 
 
Genus Xiphium (includes English and Dutch irises) 
 
Genus Iridodictyum (Reticulata irises) 
               section Iridodictyum (most of the reticulata irises) 
               section Monolepis (I. kolpakowskianum, I. winkleri) 
 
Genus Gynandriris (G. sisyrinchium. G. maricoides) 
 
Genus Juno (Juno irises) 
               section Juno 
               section Physocaulon 
                               series Drephanophyllae 
                               series Rosenbachianae 
               section Acanthospora 
 
Genus Hermodactylus (H. tuberosus, Snake's Head Iris) 
 
Genus Pardanthopsis (P. dichotoma, Vesper Iris) 
 
Genus Belamcanda (Blackberry Lilies) 
 
Hybrid genus Pardacanda (Pardanthopsis X Belamcanda; P. norrisii, Candy 
                                                             Lilies) 
 
Genus Neomarica