Iris Bostrensis

''Iris bostrensis'' 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 border between Syria and Jordan. It has greenish-grey leaves, 1–2 flowers in Spring, (in March), which have a yellowish, greenish or pale brown ground, which is then covered in many brown-black, brown-purple, or brown, spots, streaks or veining. It has a bright yellow beard, slightly tipped in purple. It is rarely cultivated as an ornamental plant in temperate regions, due to its environmental conditions of its natural habitat.

Description

It is a geophyte, with small, compact rhizomes.British Iris Society (1997) The rhizomes are close to the surface level, so that they receive maximum solar energy.

It has up to 8 (in number), greenish grey, linear or lanceolate (shaped) leaves. That can grow up to long, and nearly 1 cm wide. They start to grow in spring and fade before the end of summer.

It has a slender stem or peduncle, that can grow up to between tall.

The stems hold 1 or 2, terminal (top of stem) flowers, blooming in March,Basak Gardner & Chris Gardner or between April and May (in Europe).

The silk-like, or satin-like, flowers with brown-black, brown-purple, or brown, multiple spots, streaks or veining, over a yellowish or brownish, greenish ground. The flowers can appear to be a deep copper colour when backlit.

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 reflexed (folded backwards) and, long and between 3 and 4.5 cm wide. They have a deep maroon, semi-circular shaped signal patch, which is about 2 cm wide. In the middle of the falls, is a row of short hairs called the 'beard', which are bright yellow, and slightly purple tipped. The standards are a slightly paler colour than the falls, they are generally long and between 5 and 7 cm wide. Although variable colour forms are found.

It has style branches that are keeled, with wide spots on a yellow ground.

After the iris has flowered, it produces a seed capsule, which have not yet been described.

Biochemistry

A study was carried out in 2013, to find out what oils are contained in the rhizomes of various irises in Syria, including ''Iris germanica'', ''Iris barnumiae'', ''I. bostrensis'' and in ''Iris auranitica''. It found myristic acid, lauric acid, decanoic acid (capric acid), palmitic acid and methyl ester.

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 of 2n=20.

Taxonomy

It is known in Hebrew, it is written as איריס בוצירה.

It is sometimes mistakenly spelled ''Iris bostensis''.

The Latin specific epithet ''bostrensis'' refers to the ancient city of Bosra in Syria, due to being found close to the ancient site.

It was first published and described by Paul Mouterde in the Bull. Soc. Bot. France Vol.101 on page 420 in 1955.

It was thought that ''I. bostrensis'' was a taller form, or a different coloured variety of ''Iris atropurpurea''. In 1933, John Edward Dinsmore published ''Iris atropurpurea var. purpurea'' Dinsm. in Fl. Syria edition 2, Vol.2 on page 600. It was later classified as a synonym of ''I. bostrensis''.

It is thought that similar shaded forms of ''I bostrensis'' can be found within natural populations of ''Iris nigricans''.

It was verified by United States Department of Agriculture and the Agricultural Research Service on 4 April 2003, then changed on 2 December 2004.

''I. bostrensis'' is listed in the Encyclopedia of Life, and in the Catalogue of Life.

Distribution and habitat

It is native to temperate Asia, within the Middle east.

Range

It is found in southern Syria,Kerry Scott Walter, Harriet J. Gillett, World Conservation Monitoring Centre (from Busra (or Bosra), to Jabal al-Arab),

in northern Jordan,

(between Ramtha and Mafraq,)

and occasionally in Israel.

Habitat

It grows in dry, rocky, open scrub-land or agricultural fields, (including cornfields,), on soils containing basalt.

Conservation

In 1997, it was assessed and classed as rare within Syria, due to habitat destruction. On 5 February 2016, it was re-assessed and classed as Endangered due to the threats of agricultural development, overgrazing by cattle/livestock of local and nomadic communities. It may also be threatened by the effects of the Syria civil war.

It is grown for conservation within the Royal Botanical Garden of Jordan.

Cultivation

It is considered as a fragile, or delicate plant, it needs to be protected from direct rain or garden watering regimens.

References

Sources

* Mathew, B. The Iris. 1981 (Iris) 48

External links

Image of the iris

{{Taxonbar, from=Q12217282

bostrensis
Plants described in 1955
Garden plants
Flora of Syria
Flora of Jordan
Flora of Palestine (region)