Fraxinus latifolia

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Oregon ash
Fraxinus latifolia JPG1A.jpg
A mature tree at the National Botanic Garden of Belgium
Scientific classification edit
Kingdom: Plantae
Clade: Angiosperms
Clade: Eudicots
Clade: Asterids
Order: Lamiales
Family: Oleaceae
Genus: Fraxinus
Section: Fraxinus sect. Melioides
F. latifolia
Binomial name
Fraxinus latifolia
Fraxinus latifolia range map 5.png
Native range

Fraxinus latifolia, the Oregon ash,[1] is a member of the ash genus Fraxinus, native to western North America.


Fraxinus latifolia is found on the west side of the Cascade Range from southwestern British Columbia south through western Washington, western Oregon, and northwestern California; and in central California in the Sierra Nevada.[1][2][3]


Fraxinus latifolia can grow to 25 m (80 ft) in height, with a trunk diameter of 30–80 cm (12–31 in). The compound leaves are pinnate, 12–33 cm (4 34–13 in) long, with 5-9 leaflets, each leaflet ovate, 6–12 cm (2 144 34 in) long and 3–4 cm (1 181 58 in) broad, and often show signs of disease and brown rot, even on otherwise healthy plants. It is dioecious. The fruit is a samara, 3–5 cm (1 18–2 in) long including the wing.[1][2]

The Oregon ash prefers damp, loose soils, and grows from sea level to 900 metres (3,000 ft) in elevation, up to 1,700 metres (5,600 ft) in the south of the range in California. In central Southern California, it intergrades with Fraxinus velutina (velvet ash) of southern California east into Arizona.[1][2]


  1. ^ a b c d Plants of British Columbia: Fraxinus latifolia
  2. ^ a b c Jepson Flora Project: Fraxinus latifolia
  3. ^ Owston, Peyton W. (1990). "Fraxinus latifolia". In Burns, Russell M.; Honkala, Barbara H. Conifers. Silvics of North America. Washington, D.C.: United States Forest Service (USFS), United States Department of Agriculture (USDA). 1 – via Southern Research Station (

External links[edit]

Leaves of the Oregon ash