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4. How To Identify Blue Ash Trees (Fraxinus quadrangulata) The blue ash tree got its common name from its inner bark that will turn blue when it is exposed to air. This color was extracted to make dye. Other Common Names. Fraxinus quadrangulata is exclusively referred to as blue ash. Key Identifying Feature
Ash tree leaves: Blue ash tree leaves grow to between 8” and 15” (20 – 40 cm) long. Each pinnate leaf usually has seven leaflets; however, there can be between 5 and 11 per leaf. Their coarsely-serrated margins help identify blue ash leaves.
Blue ash (Fraxinus quadrangulata) is named for the inner bark turning blue. A distinctive characteristic of this species native to the Midwest is the square shape of young shoots. In mature trees, the gray bark forms irregular plates.
Blue Ash is an uncommon tree with a fairly narrow native range, mostly in the midwestern USA. It gets its name from the gelatinous inner bark that turns blue upon contact with the air. Early Americans used to use it as a source of dye. The fall color is not as showy as others, becoming grayish to dull yellow.
The medium-sized Blue Ash (Fraxinus quadrangulata) tree is easily identified by its unusual square-shaped twigs, which have earned it the moniker “four-cornered ash.” The Blue Ash, which may reach heights of 50 to 75 feet, is a great tree for shade.
Here is a quick key to help distinguish among them during the growing season: 1. Young branches 4-angled, often winged. F. quadrangrandulata (Blue Ash) 1. Young branches more-or-less circular in cross-section. 2. Lateral leaflets without stalks.
Description. 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.
Of the ash in Minnesota, the blue ash is the easiest to identify due to the square edges of the branches, revealing a square cross-section. The leaves are opposite, pinnately compound, and have 7 to11 leaflets. They are lance- to ovate-shaped and are long pointed with finely serrate margins.
Green and white ash are the most commonly found ash species in the Midwest with blue ash being rare. While other woody plants, such as mountainash and pricklyash, have “ash” in their name, they are not true ash, or Fraxinus species. Only true ash are susceptible to attack by emerald ash borer.
More Images. Species Native to Missouri. Common Name: blue ash. Type: Tree. Family: Oleaceae. Native Range: North America. Zone: 4 to 7. Height: 50.00 to 75.00 feet. Spread: 35.00 to 60.00 feet. Bloom Time: April to May. Bloom Description: Purple. Sun: Full sun. Water: Dry to medium. Maintenance: Medium. Suggested Use: Shade Tree, Street Tree.