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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 .
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.
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.
The coughing, sneezing, headache-nightmare-of-an-event took place on April 4, when a 30-foot river birch tree was chopped down in a residential area. Falling tree releases massive 'pollen bomb' in ...
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 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]
Urban planners and tree experts have tried for decades to keep streets and sidewalks clear of maple spinners, seed pods and fallen fruit, but these efforts may be leading to an increase in allergies.
Fraxinus uhdei is locally known as fresno blanco in Spanish; other English vernacular names include Hawaiian ash and Mexican ash. [3] The name Shamel ash refers to Archie Shamel, who introduced the trees to California in the 1920s. [7] It is known as urapan in Colombia, where it was introduced in the 1950s. [8]