Early registration
| Early registration | ||||||||||||
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| Scientific name | ||||||||||||
| Atriplex praecox | ||||||||||||
| Hülph. |
The Early Melde ( Atriplex praecox ) is a plant species from the genus of the Report ( Atriplex ) in the foxtail family (Amaranthaceae).
description
Vegetative characteristics
The Early Melde is an annual herbaceous plant . Its upright stem is branched at a height of about 30 cm in the lower part. The leaves are opposite at the lowest four nodes, above them alternately on the stem. Their leaf blades, green on both sides, are triangular with small, slightly upwardly directed side corners or rhombic-ovoid. While the closely related Stiel-Melde ( Atriplex longipes ) has a transition zone of about four leaves between the branched base and the inflorescences, this zone can be missing in the Early Melde.
Inflorescence and flower
The early registration is single-sexed ( monoecious ). Male flowers contain five bracts ( tepals ) and five stamens . Female flowers, the only of the ovary are made to be enveloped by two, rarely three egg-shaped continue reading . In contrast to the Stiel-Melde, there are no clusters of flowers that have been reduced to single-flowered pseudo-flowers with large, foliage-like pre-leaves.
The flowering period begins in Scandinavia as early as May, in the area of the former Soviet Union usually not until July.
Fruit and seeds
The vertical fruit is enveloped by the pre-leaves that are fused in the lower fifth to fourth. These are sessile or stalked up to 5 mm long, egg-shaped, with entire margins or with two to four tiny teeth on both sides. They have no appendages on their back.
There are two types of seeds ( heterocarpy ): reddish-black, sometimes elliptical, somewhat convex seeds with a diameter of usually 1.4 to 1.8 (rarely up to 2) mm and red-brown, concave seeds with a diameter of 1.7 to 2 , 2 (to 2.5) mm.
Chromosome number
The number of chromosomes is 2n = 18.
Photosynthetic pathway
The early Melde is a C 3 plant with normal leaf anatomy .
Occurrence
The northern European distribution area of the early registration includes Iceland , Great Britain , Germany , Norway , Sweden , the north and north-west European Russia , Estonia and Finland . The species is also said to occur in western Greenland and possibly even in Canada .
It inhabits the sea coasts and is scattered or rare there. In Northern Europe, it has often been wrongly identified as the spreading melde ( Atriplex patula ).
In Germany, the early registration occurs very rarely in Mecklenburg-Western Pomerania on the Western Pomerania Baltic coast.
Systematics
The early report ( Atriplex praecox ) belongs to the Teutliopsis Dumort section within the genus Atriplex . Together with the Stiel-Melde ( Atriplex longipes Drejer ) and Atriplex nudicaulis Bogusl. it is combined to form the Atriplex longipes aggregate.
The first description of Atriplex praecox was made in 1918 by Karl Alrik Hülphers in Carl Axel Magnus Lindman : Svensk Fanerogamflora , S. 228th
Synonyms of Atriplex praecox Hülph. are Atriplex longipes subsp. praecox (Hülph.) Turesson and Atriplex kuzenevae N.Semenova .
literature
- Haubold Krisch: Atriplex praecox Hülph. and Atriplex longipes Drejer (Chenopodiaceae) in morphological terms . In: Feddes Repertorium , Volume 119, 2008: pp. 281-295. doi : 10.1002 / fedr.200811169 (section description)
- Alexander P. Suchorukow: On the systematics and chorology of the Atriplex species (Chenopodiaceae) occurring in Russia and the neighboring states (within the borders of the former USSR) . In: Annals of the Natural History Museum in Vienna , Series B, 108, 2007, pp. 316 and 367–369. (PDF file; 31.4 MB) (sections description, chromosome number, photosynthetic pathway, occurrence)
Individual evidence
- ↑ a b c Pertti Uotila: Chenopodiaceae (pro parte majore) . - In: Euro + Med Plantbase - the information resource for Euro-Mediterranean plant diversity. Atriplex praecox , 2011. Entry at Euro + Med Plantbase .
- ↑ a b Entry in Panarctic Flora ( page no longer available , search in web archives ) Info: The link was automatically marked as defective. Please check the link according to the instructions and then remove this notice.
- ↑ Gudrun Kadereit, Evgeny V. Mavrodiev, Elizabeth H. Zacharias, Alexander P. Sukhorukov: Molecular phylogeny of Atripliceae (Chenopodioideae, Chenopodiaceae): Implications for systematics, biogeography, flower and fruit evolution, and the origin of C4 Photosynthesis , In: American Journal of Botany , Volume 97 (10), 2010, pp. 1664-1687.
- ↑ Atriplex praecox at Tropicos.org. Missouri Botanical Garden, St. Louis
