Acer negundo

Ash - maple (Acer negundo )

The ash - maple (Acer negundo ) is a deciduous tree species from the genus of maples ( Acer) in the family of Soapberry ( Sapindaceae ).

Dissemination

The ash - maple is native to Florida in eastern North America from Ontario to Alberta with geographical races, California and Texas. He was introduced in 1688 in Central Europe and is still one of the most planted exotic trees and shrubs. He is naturalized as a neophyte

Description

The ash - maple is a high to about 15 m tree that can reach a trunk diameter of 0.5 m. The bark is smooth and gray-brown, more dark gray in old age, but mostly by algae growth greenish. The tree crown is curved irregularly; inside it is condensed by many water shoots on the trunk and branches; ancient tribes are often leaning to decumbent.

The branches are green and straight, sometimes in the second year frosted purple. The little bud is silky white. The leaves are imparipinnate with 3-7 leaflets; the entire pinnule is great to 20 by 15 cm; the lowest Fiederpaar sits at a 1 to 2 cm long petiole, the upper pair sits right on. The individual leaflets are 5-10 cm long and are oval; they are tapered and have a few coarse teeth. The leaves are very thin and light- green above; below they are hairy brighter and often thin.

The ash - maple is dioecious getrenntgeschlechtig ( dioecious ) and wind- pollinated ( Anemogamie ). The male flowers are hanging in thin tufts and the beginning of March ( well before the leaves appear ) yellow. The female flowers are in even longer hanging grapes. The fruits are yellow white with acute, inwardly curved wings; they are 4 inches long and ripen early; neighborhood without a male tree however, they are usually "deaf ", ie not fertilized and therefore not viable.

Against smoke and dust in the urban area of ash - maple is just as sensitive to drought. However, in the age of the tree is brittle in the crown and is windbruch therefore at risk.

Varieties

• A. n var californicum ( Torr. & A. Gray ) Coffin: This variety is native to Southern California. The branches are hairy tomentose; per sheet usually sit just three leaflets that are hairy undersides to change.

Cultivated forms

Commercially several varieties with variegated foliage, among others, are available:

• ' Auratum ': This variety has some yellow leaves; In contrast to the variety ' Odessanum ' are their shoots glabrous. This variety is not nearly as nice as ' Odessanum ' and therefore practically no longer in culture. Only copies of the marketed are often referred to by ' Odessanum ' wrongly as ' Auratum '.
• ' Aureo - variegatum ': This well - Gold Maple Esch said variety has yellow- green foliage. The variety is male.
• 'Flamingo': This variety, also called Flamingo ash maple, white has pink - green foliage. The variety is female.
• ' Odessanum ': This cultivar originated in 1891 in Odessa. The young branches are densely hairy whitish; the leaves are bright golden yellow under sunny conditions. Quite frequently seen in parks and gardens.
• ' Variegatum ': This variety originated in France in 1852 is also known as silver maple - ash. It is the most commonly planted variegated form and can be found in gardens and parks everywhere. It is relatively slow-growing and has frosted shoots. The leaves are wide margins and very irregular white; in the middle they are green with scattered white fields. Young leaves are edged with pink. The fruit sit in sleek, 10 cm long racemes 5 to each fruit. The fruits have bright green wings that are shaded yellow and pink.
• Californicum var ' Violaceum: These strong growing form has brown green barren shoots, which are later almost purple-black and blue frosting. The leaves are hairy dark green and soft bottom; the petioles are red.