Common Name: Manitoba Maple
Scientific Name: Acer negundo
Leaf: Opposite, pinnately compound; composed of 3-9 leaflets on a central stock; leaflets 5-12cm long, shallowly and irregularly coarsely toothed or lobed; turns yellow in autumn.
Flower: Pale yellowish-green, tiny; unisexual with male and female flowers on separate trees; petals absent; 5 sepals; pollen flowers on slender single stalks in lateral bundles; seed flowers in loose drooping clusters with a central stem; flowers appear in spring.
Fruit: Green to pale brown pairs of winged keys (samaras); wings spreading at less than 45 degrees; keys 3-5cm long hanging in clusters often remaining on the tree over winter.
Twig: Spreading, crooked; twigs brown to greenish-purple, moderately stout hairless, shiny; often covered with waxy powder that is easily rubbed off.
Bark: Young bark light greyish-brown and smooth; mature bark darker greyish-brown, narrow-ridged.
Wood: Nearly white; soft.
Facts About this Tree:
1. Unique among native maples in that the leaves are compound. If you found a tree with compound leaves and maple keys, you are looking at a Manitoba Maple.
2. This hardy, fast-growing tree can survive on most soils even on dry and extremely cold conditions. Manitoba Maples often aggresively out-compete other native trees and are considered invasive species.
3. Unfortunately, its weak, spreading branches are easily broken by wet snow, ice and wind, and is a short-lived tree (about 60 years).
4. When sugar was scarce, Parairie settlers sometimes tapped this tree to make maple syrup, though Manitoba Maple is the least productive maple for this purpose.
Lat,Long: 43.75076, -79.64702
Diameter (DBH): 12.9 cm
Last Year Modified: 2015
Carbon Stored in this Tree: 27.984 kg of C
Equivalent CO2: 102.598 kg of C
1. Linda Kershaw. 2001. Trees of Ontario. Edmonton, AB Canada. Lone Pine Publishing
2. Farrar, J. L. 2007. Trees in Canada. ON. Canadian Forest Service.
3. City of Toronto. 2013. Controlling Invasive Plants. Urban Forestry-Forstry Facts. Retrived from http://www1.toronto.ca/city_of_toronto/parks_forestry__recreation/urban_forestry/files/pdf/Controlling_Invasive_Plants.pdf on July, 2014.
4. Photo Credit: Daniel J. Kim; Acer negundo (2) Wikimedia Commons – http://commons.wikimedia.org/wiki/File:Acer_negundo_(2).jpg#mediaviewer/File:Acer_negundo_(2).jpg; Acer negundo: Samaras (VI) by .Bambo., Flickr Creative Commons – https://flic.kr/p/4Giacb
.Copyright 2015Association for Canadian Educational Resources
The headwaters of the Humber River are in the Niagara Escarpment and Oak Ridges Moraine. The main branch of the river flows 126 kilometers from its source to Lake Ontario.