Lancet-leaved aster

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Lancet-leaved aster
Lancet-leaved aster

Lancet-leaved aster

Systematics
Order : Astern-like (Asterales)
Family : Daisy family (Asteraceae)
Subfamily : Asteroideae
Tribe : Astereae
Genre : Herbstastern ( Symphyotrichum )
Type : Lancet-leaved aster
Scientific name
Symphyotrichum lanceolatum
Willd.

The lanceolate aster ( Symphyotrichum lanceolatum (Willd.) GL Nesom , synonym : Aster lanceolatus Willd. ), Also known as the lanceolate aster, is a species of aster originally native to North America, which has also been found in Central Europe since the 19th century.

Carl Ludwig Willdenow described the species for the first time; there are also some synonymous names by other authors such as Aster paniculatus (after Lamarck ) or Aster novi-belgii agg. Like the other North American species, the lancet-leaved aster is no longer counted to the genus of the aster in the strict sense, but to the autumn aster ( Symphyotrichum ).

Lancet aster ( Symphyotrichum lanceolatum )

features

The lanceolate aster is very similar to the New Belgian aster . However, it can be easily distinguished from this by the bracts . They are 4–6 mm long and the outer bracts are at most half as long as the inner ones. The bracts are white and leathery at the base, the inner ones gradually and long pointed.

The perennial plant becomes 30 to 100 cm high, with a good supply of nutrients it can also reach a height of 150 cm. The upright stem is angular, slightly branched and short and hairy white . The up to 7.5 cm long stem leaves are lanceolate with smooth or slightly serrated edges and become smaller and smaller in the upper part of the plant.

The odorless flower heads are 1.5 to 2 cm in diameter. 20 to 40 white ray-florets surround the small yellow or reddish tubular florets .

ecology

The blooming time of the lancet-leaved aster extends from August to September. The flattened, white or light brown haired achenes are spread by the wind .

Occurrence

The lancet-leaved aster is a naturalized neophyte from North America in Europe . They are native to southern Canada, the United States, and northern Mexico. Originally introduced as an ornamental plant , it has become overgrown by the wind sowing and can be found as a water-accompanying plant in Northern and Central Europe. It occurs in Central Europe especially in societies of the order Convolvuletalia. The Federal Agency for Nature Conservation has put them on the black list for invasive species. Outside Europe, the species is ei neophyte in the Canaries and New Zealand.

In Germany, the lancet-leaved aster is not considered endangered and therefore does not receive any special legal protection .

Individual evidence

  1. ↑ Database entry at Bioflor ( Memento from March 4, 2016 in the Internet Archive ) (accessed on November 2, 2013)
  2. ↑ Database entry at info flora (accessed on November 2, 2013).
  3. ↑ a b Description (English, accessed on November 2, 2013)
  4. ^ A b Symphyotrichum in the Germplasm Resources Information Network (GRIN), USDA , ARS , National Genetic Resources Program. National Germplasm Resources Laboratory, Beltsville, Maryland. Retrieved February 24, 2018.
  5. ^ W. Lohmeyer: About some neophytes as components of the stream and river accompanying nitrophilic herbaceous corridors in West Germany. In: Nature and Landscape. Volume 46, Issue 6, 1971, pp. 166-168.
  6. ^ 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.  912 .
  7. ↑ Nature conservation assessments of invasiveness for alien vascular plants living in the wild in Germany. (PDF) Retrieved August 29, 2015 .
  8. ↑ data sheet on floraweb.de (accessed on November 2, 2013).

Web links

Commons : Lancet-leaved Aster ( Symphyotrichum lanceolatum )  - Collection of images, videos and audio files