 :  fraxinus quadrangulata (blue ash) is a species of ash native primarily to the midwestern united states from oklahoma to michigan, as well as the bluegrass region of kentucky and the nashville basin region of tennessee. isolated populations exist in alabama, southern ontario, and small sections of the appalachian mountains. it is typically found over calcareous substrates such as limestone, growing on limestone slopes and in moist valley soils, at elevations of 120â600 m.virtual herbarium of the chicago region: fraxinus quadrangulataoklahoma biological survey: fraxinus quadrangulata ==description== blue ash is a medium-sized deciduous tree typically reaching a height of 10â25 m with a trunk 50â100&nbsp;cm 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 winter buds are reddish-brown. the leaves are 20â38&nbsp;cm long, with 5â11 (most often 7) leaflets, the leaflets 7â13&nbsp;cm long and 2.5â5&nbsp;cm broad, with a coarsely serrated margin and short but distinct petiolules. the flowers are small and purplish, produced in the early spring before the leaves appear. the fruit is a samara 2.5â5&nbsp;cm long and 6â12&nbsp;mm broad, including the wing. ==history and uses== the name blue ash is derived from the blue dye extracted from the tree's inner bark through immersion in water. european colonists and american pioneers used this dye to color yarn for use in the production of textiles, sewing, crocheting, knitting, weaving, and embroidery. blue ash wood is used to make flooring, baseball bats, furniture, tool handles, crates and barrels. the city of blue ash, ohio, an 
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