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Seedlings of the tree have a high tolerance to water logging [12] which may explain why the natural habitat of green ash is almost exclusively stream sides and bottomlands. The large seed crops provide food to many kinds of wildlife. [3] Green ash is threatened by the emerald ash borer, a beetle introduced from Asia.
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.
Sorbus americana is cultivated as an ornamental tree, for use in gardens and parks. It prefers a rich moist soil and the borders of swamps, but will flourish on rocky hillsides. A cultivar is the red cascade mountain-ash, or Sorbus americana 'Dwarfcrown'. It is planted in gardens, and as a street tree. [11]
Green’s mountain ash (S. scopulina) is native to the mountains from Alaska to California, and east to the Rocky Mountains and Northern Great Plains. It grows as a multi-stemmed shrub that is ...
Fraxinus velutina is a small deciduous tree growing to 10 m tall, with a trunk up to 30 cm diameter. The bark is rough gray-brown and fissured, and the shoots are velvety-downy. The leaves are 10–25 cm long, pinnately compound with five or seven (occasionally three) leaflets 4 cm or more long, with an entire or finely serrated margin.
Oregon ash is intolerant of shade, and may eventually be replaced by more competitive trees such as bigleaf maples or conifers that block the light with their leaves or sheer size. This tree flourishes when its habitat become opened due to floods, blowdowns, or other disturbances. Oregon ash sprouts vigorously from cut stumps or fire-killed trees.
The rough bark is thin and flaky on younger trees but, with age, it becomes thick, dark grey to black, and furrowed. Young trees have egg-shaped to lance-shaped or curved, bluish green to glaucous leaves that are 60–170 mm (2.4–6.7 in) long and 16–75 mm (0.63–2.95 in) wide.
Fraxinus greggii, the littleleaf ash or Gregg's ash, is a species of flowering plant in the family Oleaceae, native to Texas and Mexico. [2] [3] A xerophytic shrub or scrubby tree reaching 6 m (20 ft), it is suitable for screens and containers. [4] [5] There is a cultivar, 'Libby Davison'. [6]