Iris (plant)

This article is about the Iris plant. For other uses, see Iris (disambiguation).
Other plants named "iris" are found elsewhere in the Iridaceae.
Iris
Iris sibirica
Scientific classification
Kingdom: Plantae
(unranked): Angiosperms
(unranked): Monocots
Order: Asparagales
Family: Iridaceae
Subfamily: Iridoideae
Tribe: Irideae
Genus: Iris
L.
Type species
Iris germanica
L.
Subgenera

Hermodactyloides
Iris
Limniris
Nepalensis
Scorpiris
Xiphium

Synonyms

Belamcanda
Hermodactylus
Iridodictyum
Juno
Junopsis
Pardanthopsis
×Pardancanda
Xiphion

Iris is a genus of 260–300[1][2] species of flowering plants with showy flowers. It takes its name from the Greek word for a rainbow, which is also the name for the Greek goddess of the rainbow, Iris. Some authors state that the name refers to the wide variety of flower colors found among the many species.[3] As well as being the scientific name, iris is also very widely used as a common name for all Iris species, as well as some belonging to other closely related genera. A common name for some species is 'flags', while the plants of the subgenus Scorpiris are widely known as 'junos', particularly in horticulture. It is a popular garden flower.

The often-segregated, monotypic genera Belamcanda (blackberry lily, I. domestica), Hermodactylus (snake's head iris, I. tuberosa), and Pardanthopsis (vesper iris, I. dichotoma) are currently included in Iris.

Three Iris varieties are used in the Iris flower data set outlined by Ronald Fisher in his 1936 paper The use of multiple measurements in taxonomic problems as an example of linear discriminant analysis.[4]

Description

Rhizomes of ornamental irises
Illustration of an iris flower with highlighted parts of the flower

Irises are perennial plants, growing from creeping rhizomes (rhizomatous irises) or, in drier climates, from bulbs (bulbous irises). They have long, erect flowering stems which may be simple or branched, solid or hollow, and flattened or have a circular cross-section. The rhizomatous species usually have 3–10 basal sword-shaped leaves growing in dense clumps. The bulbous species have cylindrical, basal leaves.

Flower

The inflorescences are in the shape of a fan and contain one or more symmetrical six-lobed flowers. These grow on a pedicel or peduncle. The three sepals, which are usually spreading or droop downwards, are referred to as "falls". They expand from their narrow base (the "claw" or "haft"[5] ), into a broader expanded portion ("limb" or "blade"[6]) and can be adorned with veining, lines or dots. In the centre of the blade, some of the rhizomatous irises have a "beard" (a tuft of short upright extensions growing in its midline),.[7] which are the plants filaments.[8]

The three, sometimes reduced, petals stand upright, partly behind the sepal bases. They are called "standards". Some smaller iris species have all six lobes pointing straight outwards, but generally limb and standards differ markedly in appearance. They are united at their base into a floral tube that lies above the ovary (known as an epigynous or inferior ovary). The styles divide towards the apex into petaloid branches; this is significant in pollination.

Iris reichenbachii fruit

The iris flower is of interest as an example of the relation between flowering plants and pollinating insects. The shape of the flower and the position of the pollen-receiving and stigmatic surfaces on the outer petals form a landing-stage for a flying insect, which in probing for nectar, will first come into contact with the perianth, then with the stigmatic stamens in one whorled surface which is borne on an ovary formed of three carpels. The shelf-like transverse projection on the inner whorled underside of the stamens is beneath the overarching style arm below the stigma, so that the insect comes in contact with its pollen-covered surface only after passing the stigma; in backing out of the flower it will come in contact only with the non-receptive lower face of the stigma. Thus, an insect bearing pollen from one flower will, in entering a second, deposit the pollen on the stigma; in backing out of a flower, the pollen which it bears will not be rubbed off on the stigma of the same flower.[9]

The iris fruit is a capsule which opens up in three parts to reveal the numerous seeds within. In some species, the seeds bear an aril.

Taxonomy

Iris is the largest genus of the family Iridaceae with up to 300 species – many of them natural hybrids.[10] Modern classifications, starting with Dykes (1913), have subdivided them. Dykes referred to the major subgroupings as sections. Subsequent authors such as Lawrence (1953) and Rodionenko (1987) have generally called them subgenera, while essentially retaining Dykes' groupings, using six subgenera further divided into twelve sections. Of these, section Limneris (subgenus Limneris) was further divided into sixteen series. Like some older sources, Rodionenko moved some of the bulbous subgenera (Xiphium, Scorpiris and Hermodactyloides) into separate genera (Xiphion, Juno and Iridodictyum respectively), but this has not been accepted by later writers such as Mathew (1989), although the latter kept Hermodactylus as a distinct genus, to include Hermodactylus tuberosus, now returned to Hermodactyloides as Iris tuberosa.[10]

Rodionenko also reduced the number of sections in subgenus Iris, from six to two, depending on the presence (Hexapogon) or absence (Iris) of arils on the seeds, referred to as arilate or nonarilate. Taylor (1976) provides arguments for not including all arilate species in Hexapogon.[10]

In general, modern classifications usually recognise six subgenera, of which five are restricted to the Old World; the sixth (subgenus Limniris) has a Holarctic distribution. The two largest subgenera are further divided into sections.

Subgeneric division

A member of subgenus Scorpiris: Iris persica, a bulbous iris
A member of subgenus Xiphium: Iris latifolia

Subgenera

Sections, series and species

Further information: List of Iris species

Distribution and habitat

Nearly all species are found in temperate Northern hemisphere zones, from Europe to Asia and across North America. Although diverse in ecology, Iris is predominantly found in dry, semi-desert, or colder rocky mountainous areas,[10] other habitats include grassy slopes, meadowlands, bogs and riverbanks.

Cultivation

A member of subgenus Limniris: Iris tectorum in China

Iris is extensively grown as ornamental plant in home and botanical gardens. Presby Memorial Iris Gardens in New Jersey, for example, is a living iris museum with over 10,000 plants, while in Europe the most famous iris garden is arguably the Giardino dell'Iris in Florence (Italy) which every year hosts a well attended iris breeders' competition. Irises, especially the multitude of bearded types, feature regularly in shows such as the Chelsea Flower Show.

For garden cultivation, iris classification differs from taxonomic classification. Garden iris are classed as either bulb iris or rhizome iris (called rhizomatous) with a number of further subdivisions. Due to a wide variety of geographic origins, and thus great genetic diversity, cultivation needs of iris vary greatly.

Iris grow well in any most garden soil types providing they are well-drained. The earliest to bloom are species like I. junonia and I. reichenbachii, which flower as early as February and March in the Northern Hemisphere, followed by the dwarf forms of I. pumila, and then by most of the tall bearded varieties, such as the German Iris and its variety florentina, Sweet Iris, Hungarian Iris, Lemon-yellow Iris (I. flavescens), Iris sambucina, I. amoena, and their natural and horticultural hybrids such as those described under names like I. neglecta or I. squalens and best united under I. × lurida.

Bearded Rhizome Iris

'Amethyst Flame'. Note prominent "beard".
Iris barbata elatior 'Barocco'

Bearded iris are classified as Dwarf, Tall, or Aril. In Europe, the most commonly found garden iris is an hybrid iris (falsely called German Iris, I. germanica which is sterile) and its numerous cultivars. Various wild forms (including Iris aphylla)[11] and naturally occurring hybrids of the Sweet iris (I. pallida) and the Hungarian iris (I. variegata) form the basis of almost all modern hybrid bearded irises. Median forms of bearded iris (intermediate bearded, or IB; miniature tall bearded, or MTB; etc.) are derived from crosses between tall and dwarf species like Iris pumila.

The bearded irises are easy to cultivate and propagate and have become very popular in gardens. A small selection is usually held by garden centres at appropriate times during the season, but there are thousands of cultivars available from specialist suppliers (more than 30 000 cultivars only for the tall bearded irises !). They are best planted as bare root plants in late summer, in a sunny open position with the rhizome visible on the surface of the soil and facing the sun. They should be divided in summer every two or three years, when the clumps become congested.

A truly red bearded iris, like a truly blue rose, remains an unattained goal despite frequent hybridizing and selection. There are species and selections, most notably based on the beardless rhizomatous Copper iris (I. fulva), which have a relatively pure red color. However, getting this color into a modern bearded iris breed has proven very difficult, and thus, the vast majority of irises are in the purple and blue range of the color spectrum, with yellow, pink, orange and white breeds also available.

The following is a selection of bearded irises which have gained the Royal Horticultural Society's Award of Garden Merit:-

  • 'Alizes'[12] (tall bearded, blue & white)
  • 'Bumblebee Deelite'[13] (miniature tall bearded, yellow/purple)
  • 'Early Light'[14] (tall bearded, pale yellow)
  • 'Jane Phillips'[15] (tall bearded, pale blue)
  • 'Langport Wren'[16] (intermediate bearded, maroon)
  • 'Maui Moonlight'[17] (intermediate bearded, pale yellow)
  • 'Orinoco Flow'[18] (border bearded, white/violet)
  • 'Raspberry Blush'[19] (intermediate bearded, pink)
  • 'Sarah Taylor'[20] (dwarf bearded, pale yellow)
  • 'Thornbird'[21] (tall bearded, pale yellow)
  • 'Titan's Glory'[22] (tall bearded, deep blue)

Bearded Iris Oncocyclus section

This section contains the cushion irises or royal irises, a group of plants noted for their large, strongly marked flowers. Between 30 and 60 species are classified in this section, depending on the authority. Compared with other irises the cushion varieties are scantily furnished with narrow sickle-shaped leaves and the flowers are usually borne singly on the stalks; they are often very dark and in some almost blackish. The cushion irises are somewhat fastidious growers, and to be successful with them they must be planted rather shallow in very gritty well-drained soil. They should not be disturbed in the autumn, and after the leaves have withered the roots should be protected from heavy rains until growth starts again naturally.

Bearded Iris Regelia section

This section, closely allied to the cushion irises, includes several garden hybrids with species in section Oncocyclus, known as Regelio-cyclus irises. They are best planted in September or October in warm sunny positions, the rhizomes being lifted the following July after the leaves have withered.

Beardless Rhizome Iris (subgenus Limniris)

There are six major subgroupings of the Beardless iris, depending on origin. They are divided into Pacific Coast, Siberica, Spuria, Louisiana, Japanese, and other.

Beardless rhizomatous iris types commonly found in the European garden are the Siberian iris (I. sibirica) and its hybrids, and the Japanese Iris (I. ensata) and its hybrids. "Japanese Iris" is also a catch-all term for the Japanese iris proper (hanashōbu), the Blood iris (I. sanguinea, ayame) and the Rabbit-ear iris (I. laevigata, kakitsubata). I. unguicularis is a late-winter-flowering species from Algeria, with sky-blue flowers blotched with yellow, produced from Winter to Spring. Yet another beardless rhizomatous iris popular in gardening is I. ruthenica, which has much the same requirements and characteristics as the tall bearded irises. In North America, Louisiana iris and its hybrids are often cultivated.

Crested Rhizome Iris (subgenus Limniris)

One specific species, Iris cristata from North America.

Bulbing Juno Iris (subgenus Scorpiris)

Often called 'junos', this type of iris is one of the more popular bulb irises in cultivation. They are generally earliest to bloom.

Bulbing European Iris (subgenus Xiphium)

This group includes irises generally of European descent, and are also classified as Dutch, English, or Spanish iris.

Bulbing Reticulate Iris (subgenus Hermodactyloides)

Reticulate irises with their characteristic bulbs, including the yellow I. danfordiae, and the various blue-purple I. histrioides and I. reticulata, flower as early as February and March. These reticulate-bulbed irises are miniatures and popular spring bulbs, being one of the first to bloom in the garden. Many of the smaller species of bulbous iris, being liable to perish from excess of moisture, should have a well-drained bed of good but porous soil made up for them, in some sunny spot, and in winter should be protected by a covering of half-decayed leaves or fresh coco-fiber.

Gallery

Uses

Aromatic rhizomes

Bombay Sapphire gin contains flavoring derived from particular bearded iris species Iris germanica and Iris pallida

Rhizomes of the German Iris (I. germanica) and Sweet Iris (I. pallida) are traded as orris root and are used in perfume and medicine, though more common in ancient times than today. Today Iris essential oil (absolute) from flowers are sometimes used in aromatherapy as sedative medicines. The dried rhizomes are also given whole to babies to help in teething. Gin brands such as Bombay Sapphire and Magellan Gin use orris root and sometimes iris flowers for flavor and color.

For orris root production, iris rhizomes are harvested, dried, and aged for up to 5 years. In this time, the fats and oils inside the roots undergo degradation and oxidation, which produces many fragrant compounds that are valuable in perfumery. The scent is said to be similar to violets. The aged rhizomes are steam-distilled which produces a thick oily compound, known in the perfume industry as "iris butter" or orris oil.

Iris rhizomes also contain notable amounts of terpenes, and organic acids such as ascorbic acid, myristic acid, tridecylenic acid and undecylenic acid. Iris rhizomes can be toxic. Larger blue flag (I. versicolor) and other species often grown in gardens and widely hybridized contain elevated amounts of the toxic glycoside iridin. These rhizomes can cause nausea, vomiting, diarrhea, and/or skin irritation, but poisonings are not normally fatal. Irises should only be used medicinally under professional guidance.

Water purification

Further information: Treatment_pond
Flowering Yellow Iris (Iris pseudacorus) at a treatment pond

In water purification, Yellow Iris (I. pseudacorus) is often used. The roots are usually planted in a substrate (e.g. lava-stone) in a reedbed-setup. The roots then improve water quality by consuming nutrient pollutants, such as from agricultural runoff. This highly aggressive grower is now considered a noxious weed and banned in some States of the USA where it is found clogging natural waterways.

In art and symbolism

An iris – species unspecified – is one of the state flowers of Tennessee. Tradition holds that the particular iris symbolizing Tennessee is a purple cultivar, to go alongside the wild-growing Purple Passion Flower (Passiflora incarnata), which is the state's other floral emblem. Greeneville, Tennessee is home to the annual Iris Festival celebrating the iris, local customs, and culture.[23]

The artist George Gessert has specialised in breeding irises.[24]

The artist Vincent van Gogh painted several famous pictures of irises.[25]

Irises, 1889, by Vincent van Gogh

The American artist Joseph Mason — a great friend of John James Audubon — painted a precise image of what was then known as the Louisiana Flag or Copper Iris (Iris fulva), to which Audubon subsequently added two Northern Paraula birds (parula americana) for inclusion as Plate 15 in his Birds of America.

The artist Philip Hermogenes Calderon painted an iris in his 1856 work Broken Vows; he followed the principles of the Pre-Raphaelite Brotherhood. An ancient belief is that the iris serves as a warning to be heeded, as it was named for the messenger of Olympus. It also conveys images of lost love and silent grief, for young girls were led into the afterlife by Iris. Broken Vows was accompanied with poetry by Henry Wadsworth Longfellow when it was first exhibited.[26]

French King Clovis I (466 – 511), when he converted to Christianity, changed his symbol on his banner from three toads to irises (the Virgin's flower).[27]

The fleur-de-lis, a stylized iris, first occurs in its modern use as the emblem of the House of Capet. The fleur-de-lis has been associated with France after Louis VII adopted it as a symbol in the 12th century. The yellow fleur-de-lis reflects the Yellow Iris (I. pseudacorus), common in Western Europe. Contemporary uses can be seen in the Quebec flag and the logo of the New Orleans Saints professional football team and on the flag of Saint Louis, Missouri.

The red fleur-de-lis in the coat-of-arms of Florence (Italy) descends from the white iris, which is native to Florence and which grew even in its city walls. This white iris, displayed against a red background, became the symbol of Florence until the Medici family, to signal a change in political power, reversed the colors, making the white one red and setting in motion a centuries-long breeding program to hybridize a red iris.

Furthermore, the fleur-de-lis is the almost-universal symbol of Scouting and one of the symbols adopted by the sorority Kappa Kappa Gamma.

A stylized Yellow Iris is the symbol of Brussels, since historically, the important Saint Gaugericus Island was carpeted in them.[28] The iris symbol is now the sole feature on the flag of the Brussels-Capital Region.

The provincial flower of Québec (Canada) is the Harlequin Blueflag (I. versicolor), called iris versicolore in French.

See also

References

  1. ↑ "WCSP: Iris". World Checklist of Selected Plant Families. Retrieved 2 June 2014.
  2. ↑ "Iris". Pacific Bulb Society. 2011-11-26. Retrieved 2012-03-03.
  3. ↑ Manning, John; Goldblatt, Peter (2008). The Iris Family: Natural History & Classification. Portland, Oregon: Timber Press. pp. 200–204. ISBN 0-88192-897-6.
  4. ↑ R. A. Fisher (1936). "The use of multiple measurements in taxonomic problems" (PDF). Annals of Eugenics 7 (2): 179–188. doi:10.1111/j.1469-1809.1936.tb02137.x.
  5. ↑ "Parts of an Iris Flower:". merlebleu. Retrieved 28 August 2015.
  6. ↑ Donald Wyman Wyman's Gardening Encyclopedia, p. 574, at Google Books
  7. ↑ Lorraine HarrisonLatin for Gardeners: Over 3,000 Plant Names Explained and Explored, p. 141, at Google Books
  8. ↑ "The Beauty and Function of the Iris Flower". wordpress.com. Retrieved 28 August 2015.
  9. ↑ Pat Willmer Pollination and Floral Ecology, p. 78, at Google Books
  10. 1 2 3 4 Rina Kamenetsky, Hiroshi Okubo, ed. (2012). "Iridaceae". Ornamental Geophytes: From Basic Science to Sustainable Production. CRC Press. p. 24. ISBN 1-4398-4924-2.
  11. ↑ Austin, Claire (2005). Irises; A Garden Encyclopedia. Timber Press. p. 124. ISBN 0881927309.
  12. ↑ "RHS Plant Selector - Iris 'Alizes'". Royal Horticultural Society. Retrieved 20 May 2013.
  13. ↑ "RHS Plant Selector - Iris 'Bumblebee Deelite'". Royal Horticultural Society. Retrieved 20 May 2013.
  14. ↑ "RHS Plant Selector - Iris 'Early Light'". Royal Horticultural Society. Retrieved 20 May 2013.
  15. ↑ "RHS Plant Selector - Iris 'Jane Phillips'". Royal Horticultural Society. Retrieved 20 May 2013.
  16. ↑ "RHS Plant Selector - Iris 'Langport Wren'". Royal Horticultural Society. Retrieved 20 May 2013.
  17. ↑ "RHS Plant Selector - Iris 'Maui Moonlight'". Royal Horticultural Society. Retrieved 20 May 2013.
  18. ↑ "RHS Plant Selector - Iris 'Orinoco Flow'". Royal Horticultural Society. Retrieved 20 May 2013.
  19. ↑ "RHS Plant Selector - Iris 'Raspberry Blush'". Royal Horticultural Society. Retrieved 20 May 2013.
  20. ↑ "RHS Plant Selector - Iris 'Sarah Taylor'". Royal Horticultural Society. Retrieved 20 May 2013.
  21. ↑ "RHS Plant Selector - Iris 'Thornbird'". Royal Horticultural Society. Retrieved 20 May 2013.
  22. ↑ "RHS Plant Selector - Iris 'Titan's Glory'". Royal Horticultural Society. Retrieved 20 May 2013.
  23. ↑ "18th Annual Iris Festival". Greenecountypartnership.com. Retrieved 2012-03-03.
  24. ↑ West [2008]
  25. ↑ Pioch (2002)
  26. ↑ Mancoff (2003): p.6,16
  27. ↑ Margaret Grieve A Modern Herbal, Volume 2 (1971), p. 435, at Google Books
  28. ↑ Chancery of the Prime Minister, Kingdom of Belgium [2007]

Bibliography

Taxonomy

External links

Wikimedia Commons has media related to Iris (Iridaceae).
Wikimedia Commons has media related to Iris cultivars by alphabet.
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