Yellow flag iris Iris pseudacorus, copyright James St. John.

Belongs within: Iridaceae.

Iris is a genus of monocotyledons found primarily in northern temperate regions, bearing showy flowers with petal-like style branches (Hickman 1993).

Characters (from Hickman 1993): Perennial; rhizome creeping or more or less tuber-like. Inflorescence with flowers 1-many. Flowers with perianth parts clawed, sepals (wider, spreading or reflexed) unlike petals (generally narrower, erect); style branches more or less petal-like, arching over stamens, each with flat, scale-like stigma on surface facing stamen, just below generally 2-lobed tip (crest). Seeds compressed, pitted.

Iris [Irideae]
|--I. sect. CalifornicaeH93
| |--I. bracteataH93
| |--I. chrysophyllaH93
| |--I. douglasiana [incl. I. douglasiana var. altissima, I. douglasiana var. oregonensis]H93
| |--I. fernaldiiH93
| |--I. hartwegiiH93
| | |--I. h. ssp. hartwegiiH93
| | |--I. h. ssp. australisH93
| | |--I. h. ssp. columbianaH93
| | `--I. h. ssp. pinetorumH93
| |--I. innominataH93
| |--I. macrosiphonH93
| |--I. munziiH93
| |--I. purdyiH93
| |--I. tenaxH93
| | |--I. t. ssp. tenaxH93
| | `--I. t. ssp. klamathensisH93
| `--I. tenuissimaH93
| |--I. t. ssp. tenuissimaH93
| `--I. t. ssp. purdyiformisH93
`--I. sect. LongipetalaeH93
|--I. longipetalaH93
|--I. missouriensisH93
`--I. pseudacorus Linnaeus 1753H93, HE80

Iris incertae sedis:
I. cristataV72
I. decoraO88
I. florentinaBW64
I. foetidissima Linnaeus 1753HE80
I. fulvaD51
I. germanica Linnaeus 1753HE80
I. goniocarpaO88
I. hexagonaL03
|--I. h. var. hexagonaD51
`--I. h. var. gigantocaeruleaD51
I. kemaonensisO88
I. lacustrisV72
I. laevigataHE80
I. monnieriHE80
I. × monspur [I. monnieri × I. spuria]CA26
I. orientalis Miller 1768HE80
I. pumilaV72
I. × robusta [I. versicolor × I. virginica]V72
I. ruthenicaH09
I. setosaD37
|--I. s. var. setosaD37
`--I. s. var. interiorD37
I. sibiricaJK80
I. spuria Linnaeus 1753HE80
I. susianaHE80
I. tectorumBW64
I. tuberosaC55
I. versicolorD37
I. virginicaD37
|--I. v. var. versicolorV72
`--I. v. var. shreveiV72
I. xiphioidesC55

*Type species of generic name indicated


[BW64] Booth, C., & J. M. Waterston. 1964. Fusarium redolens. C.M.I. Descriptions of Pathogenic Fungi and Bacteria 27.

[C55] Candolle, A. de. 1855. Géographie Botanique Raisonée: Ou exposition des faits principaux et des lois concernant la distribution géographique des plantes de l’époque actuelle vol. 2. Librairie de Victor Masson: Paris.

[CA26] Cockayne, L., & H. H. Allan. 1926. The present taxonomic status of the New Zealand species of Hebe. Transactions and Proceedings of the New Zealand Institute 57: 11–47.

[D37] Dobzhansky, T. 1937. Genetics and the Origin of Species. Columbia University Press: New York.

[D51] Dobzhansky, T. 1951. Genetics and the Origin of Species 3rd ed. Columbia University Press: New York.

[HE80] Healy, A. J., & E. Edgar. 1980. Flora of New Zealand vol. 3. Adventive cyperaceous, petalous and spathaceous monocotyledons. P. D. Hasselberg, Government Printer: Wellington (New Zealand).

[H09] Heltmann, H. 2009. Der Königstein (Piatra Craiului), die Perle der Burzenländer Gebirge. Mauritiana 20 (3): 515–527.

[H93] Hickman, J. C. (ed.) 1993. The Jepson Manual: Higher Plants of California. University of California Press: Berkeley (California).

[JK80] John, J., & K.-P. Kolbe. 1980. The systematic position of the “Theales” from the viewpoint of serology. Biochemical Systematics and Ecology 8: 241–248.

[L03] Leschen, R. A. B. 2003. Erotylidae (Insecta: Coleoptera: Cucujoidea): phylogeny and review. Fauna of New Zealand 47: 1–108.

[O88] Ohba, H. 1988. The alpine flora of the Nepal Himalayas: an introductory note. In: Ohba, H., & S. B. Malla (eds) The Himalayan Plants vol. 1. The University Museum, University of Tokyo, Bulletin 31: 19–46.

[V72] Voss, E. G. 1972. Michigan Flora. Part I. Gymnosperms and Monocots. Cranbrook Institute of Science and University of Michigan Herbarium.

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