Native to: Alabama, Arizona, Guatemala, Illinois, Kentucky, Mexico Central, Mexico Gulf, Mexico Northeast, Mexico Northwest, Mexico Southeast, Mexico Southwest, Missouri, New York, Tennessee, Vermont; Introduced into: Albania, Algeria, Altay, Argentina Northeast, Austria, Belarus, Belgium, Bolivia, Bulgaria, Buryatiya, Central European Rus, China North-Central, China South-Central, China Southeast, Czechoslovakia, East European Russia, France, Germany, Greece, Hungary, Iraq, Italy, Kazakhstan, Khabarovsk, Korea, Morocco, New Zealand South, Primorye, Sakhalin, Spain, Sweden, Tadzhikistan, Turkey, Turkey-in-Europe, Turkmenistan, Ukraine, Uzbekistan, Vietnam, West Himalaya, West Siberia, Yukon as per POWO;

 
Common name: Three-Leaved Maple, Ash Maple, Ash-leaf Maple, Black Ash,
California Boxelder, Cutleaf Maple, Cut-leaved Maple, Negundo Maple, Red River
Maple, Stinking Ash, Sugar Ash, Boxelder Maple
 


Acer negundo is a species of maple native to North America. Box elder, boxelder maple, and maple ash are its most common names in the United States.  

Acer negundo is a small, usually fast-growing and fairly short-lived tree that grows up to 10–25 metres (33–82 ft) tall, with a trunk diameter of 30–50 centimetres (12–20 in), rarely up to 1 metre (3.3 ft) diameter. It often has several trunks and can form impenetrable thickets.[4]
The shoots are green, often with a whitish to pink or violet waxy coating when young. Branches are smooth, somewhat brittle, and tend to retain a fresh green colour rather than forming a bark of dead, protective tissue. The bark on its trunks is pale gray or light brown, deeply cleft into broad ridges, and scaly.[5]
Unlike most other maples (which usually have simple, palmately lobed leaves), Acer negundo has pinnately compound leaves that usually have three to seven leaflets. Simple leaves are also occasionally present; technically, these are single-leaflet compound leaves. Although some other maples (such as Acer griseum, Acer mandshuricum and the closely related A. cissifolium) have trifoliate leaves, only A. negundo regularly displays more than three leaflets.
The leaflets are about 5–10 centimetres (2.0–3.9 in) long and 3–7 centimetres (1.2–2.8 in) wide with slightly serrate margins. Leafs have a translucent light green colour and turn yellow in the fall.
The flowers are small and appear in early spring on drooping racemes 10–20 centimetres (3.9–7.9 in) long. The seeds are paired samaras, each seed slender, 1–2 centimetres (0.39–0.79 in) long, with a 2–3 centimetres (0.79–1.2 in) incurved wing; they drop in autumn or they may persist through winter. Seeds are usually both prolific and fertile.
Unlike most other maples, A. negundo is fully dioecious and both a “male” and “female” tree are needed for either to reproduce.
  • Winter buds: Terminal buds acute, an eighth of an inch long. Lateral buds obtuse. The inner scales enlarge when spring growth begins and often become an inch long before they fall.
  • Flowers: April, before the leaves, yellow green; staminate flowers in clusters on slender hairy pedicels one and a half to two inches long. Pistillate flowers in narrow drooping racemes.
  • Calyx: Yellow green; staminate flowers campanulate, five-lobed, hairy. Pistillate flowers smaller, five-parted; disk rudimentary.
  • Corolla: Wanting.
  • Stamens: Four to six, exserted; filaments slender, hairy; anthers linear, connective pointed.
  • Pistil: Ovary hairy, borne on disk, partly enclosed by calyx, two-celled, wing-margined. Styles separate at base into two stigmatic lobes.
  • Fruit: Maple keys, full size in early summer. Borne in drooping racemes, pedicels one to two inches long. Key an inch and a half to two inches long, nutlets diverging, wings straight or incurved. September. Seed half an inch long. Cotyledons, thin, narrow.[5] 
Although native to North America, it is considered an invasive species in some areas of that continent. It can quickly colonize both cultivated and uncultivated areas and the range is therefore expanding both in North America and elsewhere.    
This species prefers bright sunlight. It often grows on flood plains and other disturbed areas with ample water supply, such as riparian habitats. Human influence has greatly favoured this species; it grows around houses and in hedges, as well as on disturbed ground and vacant lots. 
This species prefers bright sunlight. It often grows on flood plains and other disturbed areas with ample water supply, such as riparian habitats. Human influence has greatly favoured this species; it grows around houses and in hedges, as well as on disturbed ground and vacant lots.
(From Wikipedia on 16.1.13)

 

 

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Acer negundo from Kashmir : Attachments (2). 2 posts by 2 authors. 
Acer negundo from Kashmir, commonly planted in Gardens.
One of the few species of Acer with compound leaves, leaflets are usually three in this species.
Photographed on June 16, 2010


 

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Acer negundo : Srinagar,Kashmir : 20DEC16 : AK-38 : 2 posts by 2 authors. Attachments (3)
Pictures taken in one of the Mughal Gardens during last week of April. Identified by …


   

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Tree For ID : California : 17OCT14 : AK-5 : 5 posts by 4 authors. Attachments (5)
Tree seen in Fremont on 28th Sept,14.

Medium sized tree, in a school.
Acer Species?


…, the closest match I could get was to Acer negundo (California Boxelder). 


agree

i seem to have missed this post earlier
thanks … for the possibility.

quite not so uncommon in northern California


Thanks for the id and validation.


Suggested id is Acer negundo (California Boxelder) by Vijayasankar Ji.
There is another post from California also suggested to be the same, although the leaves are different.
…, could you kindly have a look?

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Tree For ID : California : 22OCT14 : AK-21 :  3 posts by 2 authors. Attachments (4).

A tall tree, seen on way to Los Angeles in the premises of one of the rest houses where we stopped for lunch.

Pictures taken on 2nd Oct,14.


It seems Acer negundo 


Thanks for the id.


For validation please. 


 

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