Northern Prairie Wildlife Research Center
OLIVE FAMILY (Oleaceae)
IND. STATUS: FACW
FIELD CHARACTERISTICS: A deciduous tree growing to a height of 25 m. Leaves are opposite and compound. The leaflets number 5-9 (usually 7) and are toothed, slightly petioled and 4-5 cm. long. The leaf scars are in a half circle. Branches are smooth and round, or nearly so. The bark is furrowed in a very tight, regular diamond pattern of crisscrossing ridges. Fruit is a wedgeshaped samara with a round or somewhat round body and a flat wing. In flower during April and May.
ECOLOGICAL NOTES: Green ash is commonly associated with floodplain forests and, to a much lesser extent, hardwood swamps. However, it is also found in rich upland habitats. Green ash is frequently used for landscaping purposes.
SOURCE: Gleason and Cronquist (1991); Petrides (1972); and Swink and Wilhelm (1994).