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Fraxinus quadrangulata
''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.〔(【引用サイトリンク】 Fraxinus Quadragulata Range Map )〕 It is typically found over calcareous substrates such as limestone, growing on limestone slopes and in moist valley soils, at elevations of 120–600 m.〔Virtual Herbarium of the Chicago Region: (''Fraxinus quadrangulata'' )〕〔Oklahoma Biological Survey: (''Fraxinus quadrangulata'' )〕
==Description==
Blue ash is a medium-sized deciduous tree typically reaching a height of 10–25 m with a trunk 50–100 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 20–38 cm long, with 5–11 (most often 7) leaflets, the leaflets 7–13 cm long and 2.5–5 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 2.5–5 cm long and 6–12 mm broad, including the wing.〔〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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