In the last several posts, I’ve been exploring the floodplain forests of Central Europe through some of their characteristic trees, including Black Alder and Black Poplar, both species closely tied to shifting sediments and mercurial river banks. Pannonian Ash belongs to the floodplain as well, but it often appears in the somewhat more stable hardwood gallery forests and ash-oak woods of lowland river systems. If Black Poplar is a pioneer and Black Alder a rooted specialist of alder carrs, then Pannonian Ash represents a more mature and structured floodplain forest.
PANNONIAN ASH (English), úzkolistý jasan, panonský jasan (Slovak; narrow-leaved ash, Pannonian ash), magyar kőris, pannóniai kőris (Hungarian; Hungarian ash, Pannonian ash), Frêne de Pannonie, Frêne à feuilles étroites (French)
Fraxinus angustifolia subsp. pannonica, fraxinus = ash (Latin); angustifolia = narrow-leaved (Latin); pannonica = of Pannonia (Latin)
Identification: This is a medium-sized tree that can reach up to 35 m tall. It has smooth, gray bark when young, which becomes cracked and knobby with age. The buds are opposite, sandpapery, and pale brown, unlike the black buds of Fraxinus excelsior. The leaves are opposite and compound, with 3–13 leaflets that are notably slender. Its samaras hang in bunches, with each samara only 3–4 cm long, roughly half seed and half wing.
Ecological Information: Pannonian Ash is a large, rapidly growing ash of lowland and hilly floodplains, especially characteristic of hardwood gallery forests and ash-oak woods. It is ecologically tied to mesic lowland river systems, where floodplain dynamics remain important but conditions are often somewhat less pioneer-dominated than in the youngest alluvial habitats.
Subspecies pannonica was identified in the 1950s by Rezső Soó and Tibor Simon. A related subspecies, angustifolia, has been planted across Australia, where it became invasive and led to the cultivation of a sterile variety sold in southeastern Australia.
Sociocultural Information: In Sicily, this species, though a different subspecies, along with Fraxinus ornus, has been cultivated for its plant sap, known as manna.
Compared with Black Alder and Black Poplar, Pannonian Ash has a more modest profile, but ecologically it is no less important. It helps define the more structured floodplain forests of the lowlands, where the river still influences taller, denser, and more compositionally complex forests.
In the next post, I’ll leave the floodplain behind and turn to another Central European ecosystem: Rock, Loess, and Light: Dry Woodlands and Steppe-Edge Habitats of Central Europe. There, the story shifts from rivers and alluvium to thin soils, drought, and the trees and shrubs that thrive at the dry edge.
References
Bartha, D. (1999). Magyarország fa- és cserjefajai. Mezőgazda Publishing House.
Sense of Place 
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