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Male flowers Seeds of Fraxinus excelsior, popularly known as "keys" or "helicopter seeds", are a type of fruit known as a samara. It is a large deciduous tree growing to 12–18 m (39–59 ft) (exceptionally to 43 m or 141 ft) tall with a trunk up to 2 m (6.6 ft) (exceptionally to 3.5 m or 11 ft) diameter, with a tall, narrow crown. [2]
However, significant mortality in Manchurian ash from emerald ash borer is also recorded in the wild in China. [8] The cultivar Fraxinus mandshurica 'Mancana' ("Manchana Ash") has been selected by the Morden Research Station, Morden, Manitoba. It has a dense oval to globose crown, and is a male tree; it is very hardy.
Female flowers Male flowers. Acer negundo, also known as the box elder, boxelder maple, Manitoba maple or ash-leaved maple, is a species of maple native to North America from Canada to Honduras. [3] It is a fast-growing, short-lived tree with opposite, ash-like compound leaves.
European ash in flower Narrow-leafed ash (Fraxinus angustifolia) shoot with leaves. Fraxinus (/ ˈ f r æ k s ɪ n ə s /), commonly called ash, is a genus of plants in the olive and lilac family, Oleaceae, [4] and comprises 45–65 species of usually medium-to-large trees, most of which are deciduous trees, although some subtropical species are evergreen trees.
In mid to late spring, the tree produces small flowers that are not very noticeable. It is dioecious; it requires two separate plants (male and female) to successfully pollinate and reproduce. The fruit, produced by female trees, is a cluster of samaras, 3–5 cm (1 + 1 ⁄ 8 –2 in) long that includes wings similar to maple trees. It is ...
Fraxinus angustifolia subsp. angustifolia has become a weed in many parts of Australia, where it is known as Desert Ash. It has been widely planted as a street and park tree, and has spread to native bushland and grasslands, as well as stream banks and drainage lines, out-competing native plants for moisture, light and nutrients. [7] [8]
Image of black ash trunk. Tree is located in a seasonally wet, riparian habitat near a small-scale stream. Tree bark is corky and spongy. Black ash is a medium-sized deciduous tree reaching 15–20 metres (49–66 ft) (exceptionally 26 metres (85 ft)) tall with a trunk up to 60 cm (24 inches) diameter, or exceptionally to 160 cm (63 inches).
Fraxinus americana, the white ash or American ash, is a fast-growing species of ash tree native to eastern and central North America. White ash trees are threatened by the invasive emerald ash borer .