Iris atrofusca

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Iris atrofusca
Ayrvs SHKHvm.jpg
Scientific classification OOjs UI icon edit-ltr.svg
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Monocots
Order: Asparagales
Family: Iridaceae
Genus: Iris
Subgenus: Iris subg. Iris
Section: Iris sect. Oncocyclus
Species:
I. atrofusca
Binomial name
Iris atrofusca
Synonyms [2] [3]
  • Iris atropurpurea var. gileadensisDinsm.
  • Iris hauranensisDinsm.
  • Iris jordanaDinsm.
  • Iris loessicolaKushnir

Iris atrofusca (Judean iris or Gilead iris) is a species in the genus Iris , where it is placed in the subgenus Iris and the section Oncocyclus. It is a rhizomatous perennial from the deserts of Israel/Palestine and Jordan. The species has long falcate (sickle-shaped) or ensiform (sword-shaped) leaves, a long thick stem and large fragrant flowers that come in shades of purple brown, reddish-black, black-brown, dark brown, dark lilac or dark purple. The flowers also have a black or brownish-black signal patch and a thick beard that is brown-black, light brown or yellow tipped with brown. It is rarely cultivated as an ornamental plant in temperate regions.

Description

It has a stout, compact rhizome, [4] with very long secondary roots. [5] The rhizomes grow level with the surface of the soil, so that they can benefit from heat from the sun. [5] The roots form dense, thick clumps [6] [7] reaching 0.5 m wide. [8]

The leaves of the iris are falcate (sickle-shaped), [5] or erect, [4] [6] [7] or ensiform (sword-shaped). [9] It is thought that specimens from the Arad valley have falcate (curved) leaves, compared with those found in the Beersheva hills or (Be'er Sheva), which have erect leaves. [10] They are also similar to Iris susiana (another Oncocyclus section Iris). [11] The iris can have up to 5–8 leaves, [4] which are greyish-green [5] [8] or pale green and slightly glaucescent. [9] They can grow up to between 15–40 cm (6–16 in) long, [5] [12] and between 0.8 and 2 cm wide. [4] [8] [12]

It has a stout stem or peduncle [9] that can grow up to between 20–45 cm (8–18 in) tall. [5] [13] [14] It is as tall as I. susiana. [9] The stem has pale green, ventricose (swollen or inflated) spathes (leaves of the flower bud), which are 9–10 cm (3.5–3.9 in) long. [9] The single terminal (top of stem) flowers [15] bloom in late March [8] [9] or April. [4] [5] [16]

The fragrant flowers [4] [6] are 10–15 cm (4–6 in) in diameter, [8] and come in darker shades ranging through purple brown, [4] [5] [14] reddish-black, [11] black brown, [6] dark brown, [5] [7] [17] dark lilac, [8] and dark purple, [4] although a yellow flowered form can be found. [4] [13] It is thought to be the darkest-coloured iris in Israel, and in Jordan is often called 'black iris'. [18] [19]

Like other irises, it has 2 pairs of petals: 3 large sepals (outer petals), known as the 'falls', and 3 inner, smaller petals (or tepals), known as the 'standards'. [20] The wide falls are recurved, [4] [9] and measure 6–7.5 cm (2–3 in) long and 3–4.5 cm (1–2 in) wide. [4] [9] They have a broad, brownish-black [4] or black signal patch in the middle. [5] [12] [14] In the middle of the falls, extending from the claw (the narrow section of petal near the stem), [9] there is a row of short hairs (velvet-like, [9] ) called the 'beard', which is brown-black, [9] light brown, [5] or yellow, [7] tipped with brown. [4] The paler [14] standards are incurved, [4] [9] and measure up to 7–9 cm (3–4 in) long and 3–4.5 cm (1–2 in) wide. [4] [9] They have heavy veining, in black, [9] ) and many reddish-black [11] dots. [4] [11] The flowers are smaller than those of Iris haynei (another Oncocyclus section iris). [6] [12]

Iris atrofusca has the longest floral longevity of 6.7 (± 1.3 days), compared to Iris atropurpurea and Iris hermona , (other 'Oncocyclus Section' irises from Israel). [21]

It has style arms which are 5 cm (2 in) long, [9] greenish yellow and spotted with purple, [4] a white anthers, [9] oblong-shaped ovary, short filaments, [9] and a 5 cm (2 in) long cylindrical green perianth tube. [9] After the iris has flowered, it produces a seed capsule, [4] which opens up with three parts, and holds many seeds inside. [8]

A study in 2005 found that pollen is transferred between flowers by night-sheltering solitary male bees, which are the only known pollinators of the plants. [21]

Genetics

As most irises are diploid, having two sets of chromosomes, this can be used to identify hybrids and classification of groupings. [20] The karyotype was counted as 2n = 20 [5] [7] [13] by Marc Simonet, then by Kushnir in 1947, then by Randolph and Mitra in 1958 and by Avishai and Zohary in 1980. [12]

Taxonomy

Seen in Tekoa Wadi nature reserve, Israel Ayrvs SHKHvm bnKHl tqv` Iris atrofusca Baker Iris loessicola.jpg
Seen in Tekoa Wadi nature reserve, Israel

The Latin specific epithet atrofusca refers to atrofusca, from 'ater' meaning "black, sable, dark, gloomy", and 'fuscus' meaning "dark, dusky, swarthy or very dark”. [8] [22]

Iris atrofusca is commonly known as 'Judean Iris', [23] [24] [25] 'Dark brown Iris', [7] [8] or 'Gilead Iris', [8] [26] [27] or 'Jil'ad Iris', [3] or 'Jal'ad Iris'. [1] [8] It is occasionally called the 'Negev Iris', [17] [28] although normally that name is used for Iris mariae .

In Hebrew, it is known as אִירוּס שָׁחוּם . [8] [16] [25] [18] In Arabic, it is common known as 'Sawsan Gilead'. [27] It is written in Arabic as سوسن جلعاد – كحيلة الكلبI . [8] It is known in Finnish as "Suklaakurjenmiekka". [29]

Iris atrofusca was first published and described by John Gilbert Baker in Gardeners' Chronicle (Gard. Chron.) in 1893, [12] [26] and in the Botanical Magazine (Bot. Mag.) in 1894 as Iris atropurpurea var. atrofusca Baker. [30] In 1896, within Flora Palaestina, vol. 4, by Naomi Feinbrun, [12] the species gained Iris jordana, Iris atropurpurea var. gileadensis, Iris hauranensis and Iris loessicola as synonyms. [13] It was listed on List of native plants of Flora Palaestina (E-O). [18] It was for many years also found as Iris haynei , [11] to which it is closely related. [6] Iris atrofusca is an accepted name by the RHS and it was last listed in the RHS Plant Finder in 1999. [31] It was verified by United States Department of Agriculture and the Agricultural Research Service on 4 April 2003, then updated on 2 December 2004. [26] It is listed in the Encyclopedia of Life, [29] and in the Catalogue of Life. [32]

Distribution and habitat

I. atrofusca on Beer Sheva trail in Israel Iris atrofusca in Beer Sheva trail.jpg
I. atrofusca on Beer Sheva trail in Israel

This species is native to temperate Western Asia. [26]

Range

It is found in Israel, [19] [31] Jordan, [5] [26] [27] and the Palestinian Territories. [7] [11] (near Nablus, [33] ) It is spread from the deserts of Samaria, [6] [16] [25] Judean desert, [12] [13] [25] Negev Desert, [12] [13] [25] the Beit Shan Valley, [13] south Golan Heights, [4] Jordan Valley, [4] [6] [13] and the valley of the Dead Sea. [25]

Habitat

It grows in the arid desert, [19] dry hills, [4] [5] rocky/stony slopes, [7] loessial plains, [4] [10] semi-steppe shrublands, or even agricultural fields. [10] [7] In the Arad valley, the plant has been under cultivation for several thousands of years. [8] [16]

It can be found at an altitude of −250 to 300 m (−820 to 980 ft) above sea level. [4] [5]

Synecology

It can be found growing naturally with phlomis , echinops and Eremostachys laciniata . [4]

Conservation

Seen near Tel Arad, Israel Iris atrofusca near Tel Arad.JPG
Seen near Tel Arad, Israel

It is a rare and endangered species, [5] [8] due to populations being threatened by over-grazing, [10] and human development including roads and settlements. [7] [12] It is listed in the Israeli Red Data Book (Shmida and Polak, 2008) as 'rare' in the Samarian Desert, [12] and also the northern Negev. [16] It is listed as 'very rare' in the Judean Mountains [12] and the Negev Highlands. [16] In Israel, there is only one national park, Tel Arad National Park, [24] that has natural population of the iris (Volis, Blecher and Sapir, 2010, Biodiversity and Conservation). [12]

Cultivation

It is hardy in places with a dry summer and full sun. [5] [7] It prefers to grow in well-drained soils. [5]

'Oncocyclus Section' Irises are easier to grow than 'Regelia Section' Irises, but should be preferably grown under glass (in frames), to protect the irises from excess moisture (especially during winter times), and also to ensure the shallow planted rhizomes get the best temperatures during the growing season. They can be grown in pots, especially in deep ones known as 'long toms', but they need re-potting every 2 years and also extra feeding. Watering is one of the most critical aspects of iris cultivation. The growth starts in October and should start with careful watering; water should never be poured directly on the rhizomes. [34]

Propagation

Irises can generally be propagated by division, [35] or from seed.

Hybrids and cultivars

It has various cultivars such as 'Atropurpurea Gileadensis', 'Hauranensis', 'Jordana' and 'Loessicola'. [12]

Toxicity

Like many other irises, most parts of the plant are poisonous (rhizome and leaves). If mistakenly ingested, it can cause stomach pains and vomiting. Handling the plant may also cause skin irritation or allergic reaction. [36]

Related Research Articles

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<i>Iris bismarckiana</i> Species of plant

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<i>Iris bostrensis</i> Species of plant

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<i>Iris haynei</i> Species of flowering plant

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<i>Iris hermona</i> Species of flowering plant

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Iris heylandiana is a species in the genus Iris, it is also in the subgenus Iris, and in the section Oncocyclus. It is a rhizomatous perennial, from the marshlands or fields of Iraq. It has short, linear or sickle shaped grey-green leaves, slender stem, a single flower in spring, which has a dingy-white, whitish, or pale background, which is covered in many spots or dark veining, in black-purple, brown-purple, or brown violet, or brown shades. It has a dark brown or burgundy brown signal patch and white tinged with yellow or orange white sparse beard. It is rarely cultivated as an ornamental plant in temperate regions, as it needs very dry conditions during the summer.

<i>Iris iberica <span style="font-style:normal;">subsp.</span> elegantissima</i> Subspecies of flowering plant

Iris iberica subsp. elegantissima is a subspecies in the genus Iris, subgenus Iris and section Oncocyclus. It is a subspecies of Iris iberica and is a rhizomatous perennial, from Armenia, Turkey and Iran. It has large, thin and falcate (sickle-shaped) leaves, slender stem with a single flower between April and May. It has a white, cream or pale yellow ground, which is covered in dark veining or speckling in violet, mauve, purple or brown shades. The larger standards are paler, normally white and less veined. The falls, have darker veining and a dark signal patch and brown or purple beard. It is commonly known as Iris elegantissima, especially in Europe and Russia. It is cultivated as an ornamental plant in temperate regions, but normally needs some protection during the winter period.

<i>Iris mariae</i> Species of plant

Iris mariae is a species in the genus Iris, it is also in the subgenus Iris and in the section Oncocyclus. It is a rhizomatous perennial, from the deserts of Israel and Egypt. It is fairly tall, with long and slender glaucous leaves, and in late spring, lilac-purple to pinkish or violet flowers with deeper veining and blackish-violet signal and dark purple beard.

<i>Iris lortetii</i> Species of plant

Iris lortetii is a species in the genus Iris. It has straight grey-green leaves, a 30–50 cm tall stem, and large showy flowers in late spring or mid-summer that come in shades of pink, from white, lilac, pale lavender and grey-purple. It is veined and dotted pink or maroon. It has a signal patch that is deep maroon and a sparse and brown, purple-brown or reddish beard.

<i>Iris petrana</i> Species of plant

Iris petrana, commonly known as the Petra iris, is a species in the genus Iris, it is also in the subgenus of Iris and in the Oncocyclus section. It has spring blooming flowers that come in shades from burgundy, dark brown to dark violet and purple. They have yellow or dark 'beards' and flower over sword-like grey-green leaves. It is normally found in the desert sands between the countries of Jordan and Israel.

<i>Iris susiana</i> Species of plant

Iris susiana, commonly known as the mourning iris, is a species of perennial plant in the family Iridaceae. The mourning iris is native to the Middle East. It grows in Lebanon, Syria and Turkey, although it is believed to be extinct in the wild. It is popular as a cut flower as the flowers can easily span 12 centimeters. The survival of the species is seriously threatened by excessive picking.

<i>Iris sprengeri</i> Species of plant

Iris sprengeri is a species in the genus Iris, it is also in the subgenus of Iris and in the Oncocyclus section. It is from the mountain slopes of Turkey. It has large flowers which are white, silver-white or cream, with purple-red or reddish-brown veining and a golden yellow beard and a dark purple or deep purple-brown signal patch.

Iris westii is a species in the genus Iris, it is also in the subgenus of Iris and in the Oncocyclus section. It is from the mountain sides of Lebanon. It has curved grey-green leaves, a stem carrying one flower in shades of lilac, white or beige with spotting or veins in a darker shade or violet. The lower petals have deep velvety chocolate or deep violet-black signal patch and a purple beard. It rare and threatened due to habitat destruction, from military actions, overgrazing by goats and other factors.

References

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  2. ↑ "Iris atrofusca Baker is an accepted name". theplantlist.org (The Plant List). 23 March 2012. Retrieved 12 April 2016.
  3. 1 2 "Jil'ad Iris". davesgarden.com. Retrieved 12 April 2016.
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  9. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 Baker, John Gilbert (1893). "Iris atrofusca". The Gardeners' Chronicle. 1: 384.
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  15. ↑ Volis, Sergei; Blecher, Michael; Sapi, Yuval (21 June 2010). "Application of complex conservation strategy to Iris atrofusca of the Northern Negev, Israel" (PDF). Biodiversity and Conservation. 19 (11): 3157–3169. doi:10.1007/s10531-010-9883-0. S2CID   35418285 . Retrieved 23 April 2016.
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  17. 1 2 Leichman, Abigail Klein (26 February 2014). "Top 10 places to see Israel's spring flowers". israel21c.org. Retrieved 14 April 2016.
  18. 1 2 3 "Iris atrofusca ~ Jal'ad Iris". royalbotanicgarden.org. Royal Botanic Garden, Jordan. Retrieved 3 May 2016.
  19. 1 2 3 Orlova, Margarita (7 March 2015). "Judean Iris". projectnoah.org. Retrieved 14 April 2016.
  20. 1 2 Austin, Claire (2005). Irises; A Garden Encyclopedia. Timber Press. ISBN   978-0881927306.
  21. 1 2 Sapir, Y.; Shmida, A.; Ne'eman, G. (24 January 2005). "Pollination of Oncocyclus irises by Night-Sheltering Male Bees" (PDF). Plant Biol. 7 (4): 417–424. doi:10.1055/s-2005-837709. PMID   16025415. S2CID   260252293 . Retrieved 3 May 2016.
  22. ↑ David Gledhill The Names of Plants , p. 61, at Google Books
  23. ↑ "Judaen Iris". tiuli.com. Retrieved 12 April 2016.
  24. 1 2 "Photo : Israel. Spring near Tel Arad National Park. Judean Iris (Iris atrofusca)". alltravels.com. Retrieved 16 April 2016.
  25. 1 2 3 4 5 6 "Iris atrofusca". wildflowers.co.il. Retrieved 5 April 2016.
  26. 1 2 3 4 5 "Taxon: Iris atrofusca Baker". ars-grin.gov (Germplasm Resources Information Network). Retrieved 13 April 2016.
  27. 1 2 3 "Salt flora". triptojordan.com. Archived from the original on 2 April 2016. Retrieved 12 April 2016.
  28. ↑ Michael Evenari, Leslie Shanan and Naphtali Tadmor The Negev: The Challenge of a Desert , p. 275, at Google Books
  29. 1 2 "Iris atrofusca". eol.org. Retrieved 13 April 2016.
  30. ↑ "Iridaceae Iris atrofusca Baker". ipni.org (International Plant Names Index). Retrieved 12 April 2016.
  31. 1 2 "Iris atrofusca". rhs.org.uk. Retrieved 13 April 2016.
  32. ↑ "Iris atrofusca". catalogueoflife.org. Retrieved 13 April 2016.
  33. ↑ Radford, E.A.; Catullo, G.; de Montmollin, B., eds. (2011). "Important Plant Areas of the south and east Mediterranean region, Priority sites for conservation" (PDF). IUCN. Retrieved 10 October 2016.
  34. ↑ "The Plantsman Buckshaw Gardens, Holwell, Sherborne, Dorset. Oncocyclus, Regelia and Reglio-cyclus Irises" (PDF). Retrieved 18 March 2020.
  35. ↑ "How to divide iris rhizomes". gardenersworld.com. Retrieved 12 October 2015.
  36. ↑ David G Spoerke and Susan C. Smolinske Toxicity of Houseplants , p. 236, at Google Books

Sources

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