The Iris - Brian Mathew (1981)

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A classification of Iris

1. Iris subgenus Iris
   1. Section Iris (The bearded or pogon irises)
   2. Section Psammiris (Spach) J. Taylor
   3. Section Oncocyclus (Siemssen) Baker
   4. Section Regelia Lynch
   5. Section Hexapogon (Bunge) Baker
   6. Section Pseudoregelia Dykes
2. Iris subgenus Limniris (Tausch) Spach (The beardless irises)
   • Section Lopiris (Tausch) Tausch (The evansia irises)
   • Section Limniris
   • Series Chinensis (Diels) Lawrence
   • Series Vernae (Diels) Lawrence
   • Series Ruthenicae (Diels) Lawrence
   • Series Tripetalae (Diels) Lawrence
   • Series Sibiricae (Diels) Lawrence
   • Series Californicae (Diels) Lawrence
   • Series Longipetalae (Diels) Lawrence
   • Series Laevigatae (Diels) Lawrence
   • Series Hexagonae (Diels) Lawrence
   • Series Prismaticae (Diels) Lawrence
   • Series Spuriae (Diels) Lawrence
   • Series Foetidissimae (Diels) Lawrence
   • Series Tenuifoliae (Diels) Lawrence
   • Series Ensatae (Diels) Lawrence
   • Series Syriaceae (Diels) Lawrence
   • Series Unguiculares (Diels) Lawrence
3. Iris subgenus Nepalensis (Dykes) Lawrence
4. Iris subgenus Xiphium (Miller) Spach
5. Iris subgenus Scorpiris Spach (The juno irises)
6. Iris subgenus Hermodactyloides Spach (The reticulate irises)