Editing Acer platanoides (section)

== Description ==
''Acer platanoides'' is a [[deciduous]] tree, growing to {{convert|20|-|30|m|ft|round=5|abbr=on}} tall with a trunk up to {{convert|1.5|m|ft|0|abbr=on}} in diameter, and a broad, rounded [[crown (botany)|crown]]. The [[Bark (botany)|bark]] is grey-brown and shallowly grooved. Unlike many other maples, mature trees do not tend to develop a shaggy bark. The shoots are green at first, soon becoming pale brown. The winter buds are shiny red-brown.

The [[leaf|leaves]] are [[opposite leaf|opposite]], [[palmately lobed]] with five lobes, {{convert|7|-|14|cm|in|frac=4|abbr=on}} long and {{convert|8|-|25|cm|in|frac=4|abbr=on}} across; the lobes each bear one to three side teeth, and an otherwise smooth margin.{{cn|date=September 2021}} The leaf [[petiole (botany)|petiole]] is {{convert|8|-|20|cm|in|frac=4|abbr=on}} long, and secretes a milky juice when broken. The autumn colour is usually yellow, occasionally orange-red.<ref>{{Cite web|url=http://www.columbia.edu/itc/cerc/danoff-burg/invasion_bio/inv_spp_summ/Acer_platanoides.html|title=Introduced Species Summary Project: Norway Maple (Acer platanoides)|access-date=September 30, 2018 |archiveurl=https://web.archive.org/web/20180909081807/http://www.columbia.edu/itc/cerc/danoff-burg/invasion_bio/inv_spp_summ/Acer_platanoides.html|archive-date=2018-09-09 }}</ref><ref>{{Cite web|url=http://edis.ifas.ufl.edu/st028|title=Acer platanoides|access-date=September 30, 2018}}</ref><ref>{{Cite web|url=https://plantfacts.osu.edu/tmi/Plantlist/ac_oides.html|title=Acer platanoides|access-date=September 30, 2018}}</ref>

[[File:Acer platanoides flower kz.jpg| thumb|Flower, close-up]]
The flowers are in [[corymb]]s of 15–30 together, yellow to yellow-green with five sepals and five petals {{convert|3|-|4|mm|in|frac=16|abbr=on}} long; flowering occurs in early spring before the new leaves emerge. The fruit is a double [[Samara (fruit)|samara]] with two winged [[seed]]s. the seeds are disc-shaped, strongly flattened, {{convert|10|-|15|mm|in|frac=8|abbr=on}} across and {{convert|3|mm|in|frac=16|abbr=on}} thick. The wings are {{convert|3|-|5|cm|in|frac=4|abbr=on}} long, widely spread, approaching a 180° angle. It typically produces a large quantity of viable seeds.

Under ideal conditions in its native range, Norway maple may live up to 250 years, but often has a much shorter life expectancy; in North America, for example, sometimes only 60 years. Especially when used on streets, it can have insufficient space for its root network and is prone to the roots wrapping around themselves, girdling and killing the tree. In addition, their roots tend to be quite shallow and thereby they easily out-compete nearby plants for nutrient uptake.<ref>{{Cite web|url=https://devostree.ca/tree-week-norway-maple-acer-platanoides/|title=Norway Maple (Acer platanoides)|date=Feb 12, 2018|website=www.devostree.ca|access-date=June 6, 2018}}</ref> Norway maples often cause significant damage and cleanup costs for municipalities and homeowners when branches break off in storms as they do not have strong wood.<ref name=rushforth>{{cite book |last=Rushforth |first=K |date=1999 |title=Trees of Britain and Europe |publisher=Collins |isbn=978-0-00-220013-4 }}</ref><ref name=afm>{{cite book |last=Mitchell |first=AF |date=1974 |title=A Field Guide to the Trees of Britain and Northern Europe |publisher=Collins |isbn=978-0-00-212035-7}}</ref>

{{Gallery
|2020 year. Herbarium. Acer platanoides. img-001.jpg|Leaf, adaxial side
|2020 year. Herbarium. Acer platanoides. img-002.jpg|Leaf, abaxial side
|2020 year. Herbarium. Acer platanoides. img-032.jpg|Fruit
}}