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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]
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.
Fraxinus latifolia is a medium-sized deciduous tree that can grow to heights of 20–25 metres (65–80 feet) in height, with a trunk diameter of 40–75 centimetres (16–30 inches) in its 100−150-year average life span. [4]
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]
Manchurian ash can be used as a medium height wind break for a farmstead. It is also highly tolerant of urban pollution and will even grow well in inner city environments. The tree also makes an excellent landscape tree in moist areas, especially along roads and ditches where a good amount of water can be available.
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 .
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).
Blue ash is a medium sized deciduous tree typically reaching a height of 10–25 m (33–82 ft) with a trunk 50–100 cm (20–39 in) in diameter. The twigs typically have four corky ridges, a distinctive feature giving them a square appearance (in cross-section), hence the species name, quadrangulata, meaning four-angled.
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