Blue ash

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Blue ash
Blue ash (Fraxinus quadrangulata)

Blue ash ( Fraxinus quadrangulata )

Systematics
Asterids
Euasterids I
Order : Mint family (Lamiales)
Family : Olive family (Oleaceae)
Genre : Ash trees ( Fraxinus )
Type : Blue ash
Scientific name
Fraxinus quadrangulata
Michx.

The Blue Ash ( Fraxinus quadrangulata ) is a deciduous tree art from the genus of ash trees in the family of Oleaceae . Their natural range is in the east of North America.

description

Bark of the blue ash

The blue ash is a deciduous tree up to 25 meters high with a rounded crown. The yellow-brown branches are sharp square, often winged and bare. The terminal buds are gray and broadly conical. The leaves are 20 to 30 centimeters long, composed and consist of seven to eleven short-stalked leaflets . The leaflets are 6 to 10 centimeters long, narrow oval to lanceolate, often curved sickle-shaped, long pointed with a broad wedge-shaped base. The leaf margin is serrated with inwardly curved teeth. The upper surface of the leaf is glabrous, the lower surface is hairy along the midrib.

The flowers are dioecious and stand in lateral panicles . Petals are missing. The flowers appear before the leaves from April to May.

The fruits are 2.5 to 5 centimeters long, flat, winged nuts , the wing of which runs down to the base.

The number of chromosomes is 2n = 46.

Distribution and ecology

Natural range

The distribution area of ​​the blue ash stretches from Arkansas through Missouri, Iowa, Illinois, Wisconsin, Michigan, Indiana, Ohio, Kentucky and Tennessee. There it thrives as floodplain and riparian wood or in dry forests on moderately dry to fresh, slightly acidic to strongly alkaline, sandy, gravelly or loamy, nutrient-rich soils in sunny locations. It tolerates heat but is only moderately frost hardy .

Systematics

The blue ash ( Fraxinus quadrangulata ) is a species from the genus of the ash ( Fraxinus ) from the olive family (Oleaceae). It is assigned to the Dipetalae section .

proof

literature

  • Andreas Roloff , Andreas Bärtels: Flora of the woods. Purpose, properties and use. With a winter key from Bernd Schulz. 3rd, corrected edition. Eugen Ulmer, Stuttgart (Hohenheim) 2008, ISBN 978-3-8001-5614-6 , p. 312.

Individual evidence

  1. ↑ a b Roloff et al .: Flora of the Woods , p. 312
  2. ↑ Fraxinus quadrangulata at Tropicos.org. In: IPCN Chromosome Reports . Missouri Botanical Garden, St. Louis
  3. ^ Fraxinus quadrangulata. In: Germplasm Resources Information Network (GRIN). United States Department of Agriculture, accessed December 29, 2010 .

Web links

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