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|familia=Aceraceae
|familia=Aceraceae
|genus=Acer
|genus=Acer
|species=negundo
|species=negundo
|common_name=Box elder, Box elder maple, Manitoba maple
|common_name=Box elder, Box elder maple, Manitoba maple
|name_ref=Flora - A Gardener's Encyclopedia
|name_ref=Flora - A Gardener's Encyclopedia
|usda_ref=Flora - A Gardener's Encyclopedia
|usda_ref=Flora - A Gardener's Encyclopedia
|max_zone=9
|max_zone=9
|image=Upload.png
|image=Acer negundo-78.JPG
|image_width=240
|image_width=240
}}
}}
'''''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. Other variant names -- some of which are regional - include Ash Maple, Ash-leaf Maple, Black Ash, California Boxelder, Cutleaf Maple, Cut-leaved Maple, Negundo Maple, Red River Maple, Stinking Ash, Sugar Ash, Three-leaved Maple, and Western Boxelder. In [[Canada]] it is commonly known as '''Manitoba Maple''' and occasionally as '''Elf Maple'''<ref>[http://cfs.nrcan.gc.ca/index/commtreesprairies/manitobamaple Community trees of the Prairie provinces - Canadian Forest Service<!-- Bot generated title -->]</ref>. In [[Russia]] it is called '''American Maple''' ({{lang-ru|американский клён}}) as well as Ash-leaf Maple ({{lang-ru|клён ясенелистный}}).
''Acer negundo'' is a small, usually fast-growing and fairly short-lived [[tree]] that grows up to 10-25 m tall, with a trunk diameter of 30-50 cm, rarely up to 1 m diameter. It often has several trunks and can form impenetrable thickets.<ref name="gelderen">van Gelderen, C.J. & van Gelderen, D.M. (1999). ''Maples for Gardens: A Color Encyclopedia''.</ref>
The shoots are green, often with a whitish to pink or violet [[wax]]y 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.<ref name=Keeler />
Unlike most other maples (which usually have [[leaf shape|simple]], [[leaf shape|palmate]]ly [[leaf shape|lobe]]d [[leaf|leaves]]), ''Acer negundo'' has [[leaf shape|pinnate]]ly [[leaf shape|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|''A. griseum'']], ''[[Acer mandshuricum]]'' and the closely-related [[Acer cissifolium|''A. cissifolium'']]) have [[leaf shape|trifoliate]] leaves, only ''A. negundo'' regularly displays more than three leaflets.
The leaflets are about 5-10 cm long and 3-7 cm wide with slightly serrate margins. Leafs have a [[translucence|translucent]] light green colour and turn yellow in the [[Autumn|fall]].
| water = ? <!--- frequent, regular, moderate, drought tolerant, let dry then soak -->
The [[flower]]s are small and appear in early spring on drooping [[raceme]]s 10-20 cm long. The [[seed]]s are paired [[Samara (fruit)|samara]]s, each seed slender, 1-2 cm long, with a 2-3 cm incurved wing; they drop in autumn or they may persist through winter. Seeds are usually both prolific and [[fertile]].
| features = <!--- flowers, fragrance, fruit, naturalizes, invasive -->
| hardiness = <!--- frost sensitive, hardy, 5°C (40°F), etc -->
Unlike most other maples, ''A. negundo'' is fully [[plant sexuality|dioecious]] and both a "male" and "female" tree are needed for either to reproduce.
| bloom = <!--- seasons which the plant blooms, if it is grown for its flowers -->
| usda_zones = ? <!--- eg. 8-11 -->
* 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.
| color = IndianRed
* 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.<ref name=Keeler />
{{Inc|
{{Inc|
[[Image:Acer-negundo.jpg|thumb|right|''A. negundo'' leaves and seeds]]
[[Image:Acer-negundo.jpg|thumb|right|''A. negundo'' leaves and seeds]]
{{edit-pests}}<!--- Type pest/disease info below this line, then delete this entire line -->
{{edit-pests}}<!--- Type pest/disease info below this line, then delete this entire line -->
==Cultivars==
==Varieties==
Cultivars:
*'Auratum' - yellowish leaves with smooth undersides
*'Auratum' - yellowish leaves with smooth undersides
*'Aureomarginatum' - creamy yellow leaf margins
*'Aureomarginatum' - creamy yellow leaf margins
*'Violaceum' - younger shoots and branches have blueish color
*'Violaceum' - younger shoots and branches have blueish color
Subspecies:
''A. negundo'' is often discussed as being comprised of three subspecies, each of which was originally described as a separate species. These are:
''A. negundo'' is often discussed as being comprised of three subspecies, each of which was originally described as a separate species. These are:
Finally, note that a few botanists treat Boxelder Maple as its own distinct genus (''Negundo aceroides'') but this is not widely accepted.
Finally, note that a few botanists treat Boxelder Maple as its own distinct genus (''Negundo aceroides'') but this is not widely accepted.
==Gallery==
==Gallery==
<gallery perrow=5>
Image:Acer negundo californicum Tehachapi.jpg| photo 1
<gallery>
Image:Upload.png| photo 1
Image:Upload.png| photo 2
Image:Upload.png| photo 2
Image:Upload.png| photo 3
Image:Upload.png| photo 3
==References==
==References==
<references/>
<!--- xxxxx *Flora: The Gardener's Bible, by Sean Hogan. Global Book Publishing, 2003. ISBN 0881925381 -->
<!--- xxxxx *Flora: The Gardener's Bible, by Sean Hogan. Global Book Publishing, 2003. ISBN 0881925381 -->
<!--- xxxxx *American Horticultural Society: A-Z Encyclopedia of Garden Plants, by Christopher Brickell, Judith D. Zuk. 1996. ISBN 0789419432 -->
<!--- xxxxx *American Horticultural Society: A-Z Encyclopedia of Garden Plants, by Christopher Brickell, Judith D. Zuk. 1996. ISBN 0789419432 -->
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