Iris benacensis

Iris benacensis
Scientific classification Edit this classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Monocots
Order: Asparagales
Family: Iridaceae
Genus: Iris
Subgenus: Iris subg. Iris
Section: Iris sect. Pogon
Species:
I. benacensis
Binomial name
Iris benacensis
Synonyms[1]

None known

Iris benacensis is a plant species in the genus Iris, it is also in the subgenus Iris. It is a rhizomatous perennial, from Italy. It has similar sized leaves and stem, and blue-purple shaded flowers, that have a white, blue and yellow beard. It was once classified as a synonym of Iris aphylla, before being re-classified as a species in its own right, although some sources still call it a synonym. It is cultivated as an ornamental plant in temperate regions.

Description

It is similar in form to Iris aphylla, but differs in flower form.[2]

It has stout and creeping rhizomes.[3]

The leaves can grow up to less than 30 cm (12 in) long.[3]

It has a slender stem, that can grow up to 30 cm (12 in) tall,[4]: 120  the stem is just longer than the leaves.[3]

The stem has lanceolate spathes (leaves of the flower bud), that are tinted with purple.[3] They have (scarious) membranous tips, when the plants are in flower.[3]

The stems hold terminal (top of stem) flowers, blooming early season,[3] between May and June.[5]

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'.[6]: 17  The flowers are 4–5 cm (2–2 in) in diameter, measuring from the tip of the fall to that of a standard.[3] They come in shades of blue-purple,[3][4]: 120 [7] The falls are narrow,[2] obovate, 8–9 cm (3–4 in) long and 3–4 cm (1–2 in) wide. It has a white section beneath the style, that is crossed with purple lines.[3] In the centre of the fall, is a dense beard of white hairs that are slightly tipped with blue in front and yellow behind.[2][3] The standards are oblong, 8–9 cm (3–4 in) long and 3–4 cm (1–2 in) wide.[3]

It has a perianth tube is 3–4 cm (1–2 in) long.[3]

It has shorter anthers than filaments, with blue pollen. It also has style arms that are 3–4 cm (1–2 in) long, with deltoid shaped crests.[3]

After the iris has flowered, it produces a seed capsule and seeds, that have not been described.

Genetics

In 1956, a karyotype analysis was carried out on 40 species of Iris, belonging to the subgenera Eupogoniris and Pogoniris. It found that the 40-chromosome dwarf species, such as Iris benacensis, have in their somatic complement 16 chromosomes morphologically very similar to those of Iris pseudopumila.[8]

In 2008, a genetic and morphological study was carried out on Iris aphylla populations in Italy. Some populations (in Piemonte) were re-classified as Iris perrieri and plants labelled as Iris benacensis were not either Iris perrieri or Iris aphylla.[9]

In 2012, a study was carried out on the flora of Italy, using Ellenberg's Indicator values.[10]

As most irises are diploid, having two sets of chromosomes, this can be used to identify hybrids and classification of groupings.[6]: 18  It has a chromosome count: 2n=40.[11]

Taxonomy

In Italy, it is known as 'Giaggiolo del Garda'.[5]

The Latin specific epithet benacensis refers to Lake Garda in northern Italy, which was known to the Romans as 'Benacus'.[12][13] It is also used by Romanogobio benacensis, a fish from Slovenia and Italy.

A specimen was collected by Anton Kerner von Marilaun in 1887 in south Tyrol, Italy.[2]

A herbarium specimen was collected in Trentino-Alto Adige, Italy, by (collector) Anton Kerner von Marilaun.[14]

It was described by A.Kern. in Verhandlungen der Zoologisch-Botanischen Gesellschaft' in Wien Vienna, (Verh. Zool.-Bot. Ges. Wien) on page 649 in 1887.[3] In 1892, it was then widely published by Stapf. in 'Handbook of the Irideae' in London, (Handb. Irid.) Vol.35.[15]

It was later re-classified as a synonym of Iris aphylla,[16][17][18] by William Rickatson Dykes.[7]

It was also thought to be also included as a subspecies of Iris cengialti.[4]: 146 

Before being separated again as a species in its own right in 2008.[9]

It has not been verified by United States Department of Agriculture and the Agricultural Research Service as of 9 September 2015.

It is listed in the Encyclopedia of Life.[19]

Iris benacensis is not yet an accepted name by the RHS.

Distribution and habitat

It is native to Europe.

Range

It is found in Italy,[4] within the provinces of South Tyrol,[3][15] and Como[20]

It is also found near Lago di Garda (or Lake Garda) and Mt. Brione,[9](near the town of Riva del Garda) and Mount Cengialti.[7]

Habitat

It grows on calcareous (containing lime or chalk) rocks.[3]

They can be found at an altitude of up to1,000 m (3,300 ft) above sea level.[5]

Conservation

Triangolo lariano in Province of Como, Italy has a 'Flora Protected List' since 24 July 2008 on Annex C1 is Iris pallida, Iris pseudacorus and Iris sibirica. On Annex C2 is Iris benacensis and Iris graminea.[20][21]

Some specimens can be found in nature area near Largo di Gardo which includes Mount Cengialti and Mount Brione.[7]

Cultivation

It is hardy to USDA Zone 8.[5]

It needs medium to high light conditions and temperatures[10]

It is thought to be easy to grow,[3] and worthy of being cultivated (used in the garden).[22] worthy of cultivation

A herbarium specimen can be found at University of Vienna, Austria within the 'Institute for Botany'.[14]

Toxicity

Like many other irises, most parts of the plant are poisonous (rhizome and leaves), and if mistakenly ingested can cause stomach pains and vomiting. Handling the plant may cause skin irritation or an allergic reaction.[23]

References

  1. ^ "Iris benacensis A.Kern. ex Stapf is an accepted name". theplantlist.org (The Plant List). 23 March 2012. Retrieved 11 September 2015.
  2. ^ a b c d Franco, Alain (3 December 2013). "(SPEC) 'Benacensis'". wiki.irises.org (American Iris Society). Retrieved 12 September 2015.
  3. ^ a b c d e f g h i j k l m n o p q Richard Lynch The Book of the Iris (1904), p. 139-140, at Google Books
  4. ^ a b c d Cassidy, George E.; Linnegar, Sidney (1987). Growing Irises (Revised ed.). Bromley: Christopher Helm. p. 146. ISBN 978-0-88192-089-5.
  5. ^ a b c d "Iris benacensis". luirig.altervista.org. Retrieved 12 September 2015.
  6. ^ a b Austin, Claire (2005). Irises; A Garden Encyclopedia. Timber Press. ISBN 978-0881927306.
  7. ^ a b c d Chapman, Chuck (2 April 2005). "RE: pallida and variegata distribution". hort.net. Retrieved 12 September 2015.
  8. ^ Mitra, Jyotirmay (1956). "Karyotype analysis of bearded iris". Bot Gaz. 117 (4): 265–293. doi:10.1086/335916. S2CID 85117341. Retrieved 12 September 2015.
  9. ^ a b c Colasantea, M.; Mathew, B. (2008). "Species of natural hybrid origin and misinformation in the Irises: A reappraisal of the presence of I. aphylla L. in Italy". Plant Biosystems. 142 (1): 172–178. Bibcode:2008PBios.142..172C. doi:10.1080/11263500701873026. S2CID 83779775.
  10. ^ a b Guarino, R.; Domina, G.; Pignatti, S. (28 December 2012). "Ellenberg's Indicator values for the Flora of Italy- first update: Pteridophyta, Gymnospermae and Monocotyledoneae". Fl. Medit. 22: 197–209. doi:10.7320/flmedit22.197. hdl:10447/69103.
  11. ^ "Iris benacensis A. Kern. ex Stapf (Iridaceae)". biologia.unipi.it. Retrieved 11 September 2015.[permanent dead link‍]
  12. ^ Adrian S. Hollis Fragments of Roman Poetry C.60 BC-AD 20, p. 115, at Google Books
  13. ^ Catherine Richards Adventure Guide to Milan and the Italian Lakes, p. 310, at Google Books
  14. ^ a b "WU – Herbarium WU – 63462". europeana.eu. Retrieved 12 September 2015.
  15. ^ a b Iridaceae Iris benacensis A.Kern. ex Stapf. Vol. 37. ipni.org (International Plant Names Index). Retrieved 11 September 2015.
  16. ^ Stolley, Gregor. "The genus Iris in Germany". offene-naturfuehrer.de. Retrieved 20 February 2015.
  17. ^ Laurin, Terry (19 November 2014). "(SPEC) Iris aphylla L." wiki.irises.org (American Iris Society). Retrieved 22 August 2015.
  18. ^ "Chapter I Rhizomatous Iris (part 1)". irisbotanique.over-blog.com. Retrieved 26 August 2015.[permanent dead link‍]
  19. ^ "Iris benacensis". eol.org. Retrieved 9 September 2015.
  20. ^ a b "Mountain Community Larian Triangle" (PDF). triangololariano.it. Retrieved 12 September 2015.
  21. ^ "Protection of flora in Lombardy". montagnamadeinitaly.it. Retrieved 12 September 2015.[permanent dead link‍]
  22. ^ John Harrison DickGarden Guide, the Amateur Gardener's Handbook (1917) at Google Books
  23. ^ David G Spoerke and Susan C. SmolinskeToxicity of Houseplants, p. 236, at Google Books

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