Iris Cengialti

''Iris pallida'' subsp. ''cengialti'' is a subspecies in the genus ''Iris'', it is also in the subgenus ''Iris''. It is a rhizomatous perennial, from Italy and (part of the former country of Yugoslavia) Slovenia. It has yellowish-green, glaucous, lanceolate or ensiform leaves, tall stem, green flushed with purple spathes, 2 short branches, 2–3 scented flowers, in shades of violet, blue-violet, deep purple, blue-purple, deep blue-purple, pale purple, deep blue, to mid-blue. It has a yellow or orange tipped beard. It was originally published as ''Iris cengialti'' but then re-classified as a subspecies of ''Iris pallida'', and known as ''Iris pallida'' subsp. ''cengialti'', but it is often still called ''Iris cengialti''. It is cultivated as an ornamental garden plant in temperate regions.

Description

It has a long, stout,Richard Lynch fleshy, light-coloured (underground) rhizome. That is 1–3 cm wide (in diameter), and has long secondary roots. It forms creeping plants.

It has yellowish-green, lanceolate, or ensiform (sword-shaped), leaves, that are glaucous. The basal leaves, can grow up to between long, and about 1.3 cm wide. The herbaceous leaves (die in the winter), sheath the stem.

It has a round (in section) stem, or peduncle, that can grow up to between , or tall.
The stems are taller than the leaves, and at higher levels on the mountains, the plants are shorter. It is also shorter than ''Iris pallida''.

The stem has glaucous green and ensiform spathes (leaves of the flower bud). They are slightly flushed with purple, and before flowering, they become pale brown, (scarious) membranous, and papery, They are 2.5 cm long, and between wide.

It has 2 short branches (or pedicels). The stems (and the branches) hold between 2 and 3 flowers, It can have up to 6 flowers, but normally has 3 flowers, in spring, between April to June, or May, to July.

The small, scented flowers, are in diameter, come in shades of blue, from violet, blue-violet, deep purple, blue-purple, deep blue-purple, pale purple, deep blue, to mid-blue.

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'. The falls are obovate or cuneate shaped, they are long and wide. In the centre of the falls, is a short, (16–30 mm,) thick row of small hairs (the beard), which is yellowish-white, bright yellow, or white with orange tips. The standards are a similar size to the falls.

It has 2.5 cm long style branch, that is paler than the falls and standards, and has deltoid crests.
It also has a six grooved, ellipsoid ovary, and a 0.6–0.8 cm long perianth tube.

After the iris has flowered, it produces an ovoid seed capsule, that is long and 1 cm wide, with 3 sections, which contain 15–20 oval grey or yellowish seeds.

Genetics

In 1956, a karyotype analysis was carried out on 40 species of Iris, belonging to the subgenera ''Eupogoniris'' and ''Pogoniris''. It found that 24-chromosome tall bearded species could be divided into 3 karyotypes of ''Iris pallida''. ''Iris kashmiriana'' has 2 pairs of median-constricted marker chromosomes, ''Iris illyrica'', ''Iris cengialti'', and ''Iris imbricata'', lastly ''Iris variegata'', ''Iris reginae'' (later classified as a synonym of ''Iris variegata''), and ''Iris perrieri'' all have no median-constricted chromosomes.

As most irises are diploid, having two sets of chromosomes, this can be used to identify hybrids and classification of groupings.
It has a chromosome count: 2n=24.

Taxonomy

It is commonly known as 'Iris del Cengio', 'Monte Cengio iris'.

In Italy, it is known as 'Giaggiolo del Cengio Alto'. In Slovenia, it is known as 'Bohinj Iris', or 'Bòcje of lof'. In German, it is known as 'Rovereto Schwertlilie'.

It is sometimes misspelt as ''Iris cengualti''.

The Latin specific epithet ''cengialti'' refers to a mountain or large hill 'Mount Cengialto' (also known as Monte 'Cengio Alto',), close to the town of Rovereto, in northern Italy. Confusingly, another mountain near Arsiero in the province of Vicenza (Veneto), is also known as Monte Cengio Alto.

It was found by Francesco Ambrosi in 1854, on Monte Cengialto,

It was then published as ''Iris cengialti'' by Ambrosi in Flora del Tirolo Meridionale Vol.1 (Fl. Tirolo Mer.) on page 643 in 1854, then fully published and described by A. Kerner in Österreichische Botanische Zeitschrift (Oesterr. Bot. Z.) Vol. 21, No.9, on pages 225–231 in September 1871. A. Kerner was then assigned the author of the name ''Iris cengialti'', previously ascribed to Ambrosi.

''Iris pallida'', ''Iris cengialti'' and ''Iris illyrica'' are all considered closely related but often given different taxonomic rank (by various authors Kerner, 1871; Ambrosi, 1854; Foster, 1886; Tommasini,
1875; Pampanini, 1909; Lausi, 1964; Mathew, 1981; Colasante, 1995: Terpin et al., 1996).

In May 1886, Sir Michael Foster noted in Gardeners' Chronicle on pages554 and 555, that it had similarities with ''Iris pallida''. William Rickatson Dykes in his book in 'Handbook of Garden Irises' in 1914, suggested that ''Iris cengialti'' and ''Iris pallida'' were connected and should be merged under ''Iris pallida''. In 1939, Brian Mathew considered it to be a subspecies of ''Iris pallida''.

Then in Giorn. Bot. Ital. Vol.130 on page575 in 1996, ''Iris cengialti'' was classified as a synonym of ''Iris pallida'' subsp. ''cengialti''.

It is normally classified as ''Iris pallida'' subsp. ''cengialti'', and thought to be a naturally occurring hybrid.

In Slovenia, a form of the plant is called ''Iris cengialti vochinensis'', or ''Iris pallida'' subsp. ''cengialti'' f. ''vochinensis''.

probably of Asia Minor origin,

It was verified as ''Iris pallida'' subsp. ''cengialti'' by United States Department of Agriculture and the Agricultural Research Service on 27 February 2002, and then updated on 1 December 2004.

It is listed in the Encyclopedia of Life,
and listed on the Catalogue of Life as ''Iris pallida'' subsp. ''cengialti''.

Distribution and habitat

It is native to Europe.

Range

It endemic in the alpine region, on the Dolomites (mountain range).Erika Pignatti and Sandro Pignatti

It is found in north east Italy, (within the region of Trentino, and Veneto) and (part of the former Yugoslavia), in Slovenia, (within the regions of Bohinj. and Istria).

In Trentino, it has found on Monte Zugna (south of Rovereto), and Mount Brione. In Veneto, it can be found on Mount Summano, in the province of Belluno.

Habitat

It grows on the rocky mountain sides, on scree, in meadows, and dry grasslands. Usually on karst, or limestone soils.

They can be found at an altitude of above sea level.

They can found in the Dolomites, with other plants including; '' alyssum ovirense'', '' androsace villosa'', '' centaurea haynaldii'', '' crepis froelichiana subsp. dinarica'', ''eritrichium nanum'', ''euphorbia kerneri'', ''geranium argenteum'', ''leontodon berinii'', ''lilium carniolicum'', '' potentilla incana'' and ''thlaspi minimum''.
They also grow in the Belluno forests of ''Acer pseudoplatanus'' (Mount Maple) and ''Tilia platyphyllos'' (Lime tree) with other geophytes and ''Leontodon tenuiflorus'' (Dandelion insubrico), ''Knautia persicina'', ''Globularia nudicaulis'' and ''Paeonia officinalis'' (Wild Peony).
In Slovenia, in Bohinj, it grows in meadows with another rare plant, ''Linnaea borealis'' (twinflower).

Conservation

It is a rare plant, although locally it is abundant on the mountains, growing in masses, hanging onto relatively steep slopes.

In Italy, it is listed as a protected species of regional interest (Annex B, LR 9/2007, Art. 96), and would be classed as 'vulnerable' on the IUCN Red List.

Cultivation

It is hardy to 0 °C.

It prefers could grown in rich (in fertile loan,), well drained soil in full sun.

It can be grown the rock garden.

It is generally not attacked by pests and diseases.

A herbarium specimen can be found at the Museum National d'Histoire Naturelle in Paris.

Propagation

Irises can generally be propagated by division. They should be lifted every three or four years, after the flowers are over. The tuber can be divided, with the dead roots trimmed and removed. The remains can then be replanted in enriched soil (with added compost). The leaves should be cut back to half their length, to prevent wind rock.

Hybrids and cultivars

It has been used in hybridizing (or breeding programmes), and the hybrids that have ''Iris cengialti'' as a parent, can have multiple flowers, on average between 5 and 8. The branches are generally short on slender stems.Benjamin Yoe Morrison

Toxicity

Like many other irises, most parts of the plant are poisonous (rhizome and leaves), if mistakenly ingested can cause stomach pains and vomiting. Also handling the plant may cause a skin irritation or an allergic reaction.David G Spoerke and Susan C. Smolinske

References

Sources

* Mathew, B. 1981. The Iris. 24. ists as ''Iris cengialtii'' Ambrosi
* Pignatti, S. 1982. Flora d'Italia. ccepts subsp.* Terpin, K. et al. 1996. Author and type of the name ''Iris cengialti'' (Iridaceae). Giorn. Bot. Ital. 130:575–578.
* Tutin, T. G. et al., eds. 1964–1980. Flora europaea. ists as ''I. cengialti'' Ambrosi

External links

Has a large image of the flower in the Belluno Dolomites National Park in Italy

Painting of the iris, from the collection of Botanical Garden – University of Padova
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{{Taxonbar, from=Q22285048

pallidula subsp. cengialti
Plants described in 1871
Garden plants
Flora of Europe
Flora of Italy
Flora of Slovenia
Plant subspecies