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Acer negundo is a fast-growing and fairly short-lived tree that grows up to 10–25 metres (35–80 feet) tall, with a trunk diameter of 30–50 centimetres (12–20 inches), rarely up to 1 m (3 ft 3 in) diameter. It often has several trunks and can form impenetrable thickets. [4] The typical lifespan of box elder is 60 - 75 years.
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.
Description. Fraxinus pennsylvanica is a medium-sized deciduous tree reaching 12–25 metres (39–82 feet) (rarely to 45 m or 148 ft) tall with a trunk up to 60 centimetres (24 inches) in diameter. The bark is smooth and gray on young trees, becoming thick and fissured with age. The winter buds are reddish-brown, with a velvety texture.
Green ash leaves are similar in color on upper and lower sides, and twigs are smoother. White ash leaves turn yellow or red in autumn. Despite some overlap, the two species tend to grow in different locations as well; white ash is a forest tree that commonly occurs alongside sugar maple while green ash is a pioneer species that inhabits ...
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]
Pumpkin ash is a member of the olive family and is placed in section Melioides of the genus Fraxinus. [7]Historically, it was frequently called Fraxinus tomentosa Michx., but since Michaux used this name interchangeably with the species now known as green ash (F. pennsylvanica), the name Fraxinus profunda, which was applied by Benjamin Franklin Bush in 1901, was given precedence.
Description. It is a medium-sized deciduous tree growing to 20–30 m tall with a trunk up to 1.5 m diameter. The bark is smooth and pale grey on young trees, becoming square-cracked and knobbly on old trees. The buds are pale brown, which readily distinguishes it from the related Fraxinus excelsior (black buds) even in winter.
Description. Fraxinus ornus is a medium-sized deciduous tree growing to 15–25 m (49–82 ft) tall with a trunk up to 1 m diameter. The bark is dark grey, remaining smooth even on old trees. The buds are pale pinkish-brown to grey-brown, with a dense covering of short grey hairs.