Nartheciaceae

Aletris aurea

The Nartheciaceae are a family in the order Yamswurzelartige ( Dioscoreales ). The approximately four genera with about 41 species occur in the northern hemisphere and in Südamerkika.

• 3.1 Notes and references

Description

Habit and foliage leaves

There are perennial herbaceous plants. Often they form rhizomes as outlasting. The alternate, spiral and basal leaves are sessile standing together. The parallel venation and ganzrandige leaf blade is usually isobifacial.

Inflorescences and flowers

They form racemose inflorescences. There are bracts but no cover pages available. The blooms are triple. The six identically shaped bracts ( tepals ) are fused only at their base. There are two circles, each provided with three fused only at their base stamens. Three carpels are half under constant to superior ovaries fused with many ovules per ovary chamber.

Fruit and seeds

The dreikammerigen capsule fruits are surrounded by the bloom cladding and remain on the plants for a long time. The seeds contain helobiales endosperm.

Ingredients and chromosomes

It is chelidonic available. It is incorporated into calcium oxalate druses.

The chromosomes are 0.7-1.4 microns long. The basic chromosome numbers be x = usually 13, rarely 12, 21, 22

Systematics and distribution

The area of ​​the family is strongly disjoint: with species in the temperate latitudes of the northern hemisphere (Europe and North America ), species in Asia ( East Asia and Southeast Asia), and species in northeastern South America ( Venezuela and Guyana ).

The family name Nartheciaceae in 1846 by Elias Magnus Fries in Jonas Bjurzon: Scandinavia published Växtfamiljer i sammandrag framställda, Upsala, p 64. Type genus is Narthecium Huds. ; its scientific name from the Greek word narthex for staff derives, this refers to the inflorescence form.

The position of the genera that are now classified in the Nartheciaceae has long been debated. For a long time it was placed in the Liliaceae, Dahgren et al. In 1985, she put together with genres of today's Tofieldiaceae and Petrosaviaceae in the Melianthaceae and Tamura 1998, she filed in the Petrosaviaceae. Molecular genetic studies have shown that they are close to the Burmanniaceae, Dioscoreaceae, Taccaceae and Thismiaceae and as a basal group in the order of Dioscoreales include ( Caddick et al. 2000, 2002 ). The monotypic genus Metanarthecium Maxim. was discussed at length and the only way Metanarthecium luteoviride Maxim. with two varieties of the Kuril Islands to Japan and Korea by Merckx et al. 2008 to the genus Aletris incorporated as Aletris luteo - viride.

There are about four genera with about 41 species in the family of Nartheciaceae:

• Aletris L.: It comes with 25 to 33 species in North America, the Bahamas and eastern Asia before.
• Lophiola Ker Gawl. Contains only one type: Lophiola aurea Ker Gawler: It occurs in North America.

Swell

• The Nartheciaceae in APWebsite family. (Section Description and systematics)
• SG Aiken, MJ Dallwitz, LL Consaul, CL McJannet, LJ Gillespie, RL Boles, GW Argus, JM Gillett, PJ Scott, R. Elven, MC LeBlanc, AK Brysting & H. Solstad: Nartheciaceae in Arctic Flora of the Canadian Archipelago: online. (English)
• LR Caddick, JR Rudall, P. Wilkin, TAJ Heddersonn & Mark W. Chase: Phylogenetics of Dioscoreales based on combined morphological and molecular Analyses of data in bot J. Linn.. Soc., 138, 2002.
• Vincent Merckx, Peter Schols, Koen GEUTEN, Suzy Huysmans & Erik Smets: Phylogenetic Relationships in Nartheciaceae ( Dioscoreales ), with focus on pollen and Orbicule Morphology in Belgian Journal of Botany, Volume 141, Number 1, September 2008, pp. 64 - 77: full-Text PDF.