Rod lettuce

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Rod lettuce
Tail lettuce (Lactuca viminea)

Tail lettuce ( Lactuca viminea )

Systematics
Euasterids II
Order : Astern-like (Asterales)
Family : Daisy family (Asteraceae)
Subfamily : Cichorioideae
Genre : Lettuce ( Lactuca )
Type : Rod lettuce
Scientific name
Lactuca viminea
( L. ) J. Presl & C. Presl

The rods cos ( Lactuca viminea ) is a plant from the genus lettuce ( Lactuca ) within the family of Compositae (Asteraceae).

description

The tail lettuce is a two-year-old, possibly evergreen hemicryptophyte . This half-rosette plant forms a turnip . The species grows to heights of 30 to 60 centimeters. The stem is yellowish white and pithy. It has rod-shaped, upright branches. The leaves are coarse and sagging. The lower ones are pinnate, the upper ones undivided and linear. The heads are five-flowered.

The flowering period extends from July to August.

The number of chromosomes is 2n = 18.

The achenes are beaked and have a pappus with feathered, pure white hair.
The fruiting bodies of the achenes are compressed flat.

Occurrence

The rod lettuce is found in Europe, the Canary Islands, North Africa, West Asia, Turkmenistan and the Caucasus. The species grows on dry rock corridors, in patchy dry grasslands and in dry shrubbery fringes. It grows in societies of the order Agropyretalia, but also of the Festuco-Brometea class or the Geranion sanguinei association. The species is now extinct in Germany. It used to occur in Saxony on the Elbe and, as an unstable neophyte, possibly also in Saxony-Anhalt.

Systematics

One can distinguish the following subspecies:

  • Lactuca viminea subsp. chondrilliflora (Boreau) St.-Lag. : It occurs in Morocco, Algeria, Tunisia, Portugal, Spain, France, Italy and Croatia.
  • Lactuca viminea subsp. ramosissima (all.) Arcang. : It occurs in Morocco, Spain, Andorra, France, Corsica, Italy, Croatia, Albania, Greece and in the Aegean Sea.
  • Lactuca viminea subsp. viminea .

photos

  • Habit, the stem is bone-like and hard.

  • Basal rosette of a young plant

  • Stem base with dead basal leaves

  • The leaves have auricles that are 1 to 2 cm long on the stem.

  • The leaves are deeply pinnate.

  • Inflorescence: each basket usually has five ray-florets.

literature

  • Eckehart J. Jäger, Klaus Werner (ed.): Rothmaler excursion flora from Germany. Volume 4: Vascular Plants: Critical Volume . Spektrum Akademischer Verlag, Munich 2005, ISBN 3-8274-1496-2 , p. 737.

Individual evidence

  1. ↑ a b Erich Oberdorfer : Plant-sociological excursion flora for Germany and neighboring areas . With the collaboration of Angelika Schwabe and Theo Müller. 8th, heavily revised and expanded edition. Eugen Ulmer, Stuttgart (Hohenheim) 2001, ISBN 3-8001-3131-5 , pp.  989 .
  2. ^ Lactuca in the Germplasm Resources Information Network (GRIN), USDA , ARS , National Genetic Resources Program. National Germplasm Resources Laboratory, Beltsville, Maryland. Retrieved April 13, 2018.
  3. ↑ a b c Werner Greuter (2006+): Compositae (pro parte majore). - In: W. Greuter & E. von Raab-Straube (ed.): Compositae. Euro + Med Plantbase - the information resource for Euro-Mediterranean plant diversity. Datasheet Lactuca viminea In: Euro + Med Plantbase - the information resource for Euro-Mediterranean plant diversity.

Web links

Commons : Rod lettuce ( Lactuca viminea )  - Album with pictures, videos and audio files