In recent posts, I have been exploring the dynamic floodplain forests found along the iconic Danube, Morava, and Tisza Rivers, including the resilient, rooted, and red-hued Black Alder. But Black Alder is not alone in its ability to live with instability. It is joined by Black Poplar, a tree of fresh alluvium and recovering riverbanks, offering hope with its fluttering leaves and light wood. If Black Alder suggests rootedness in the wet earth, Black Poplar evokes movement: new sediments and fast growth along the mercurial riverbank.
BLACK POPLAR (English), topol černý (black poplar, Czech), topoľ čierny (black poplar, Slovak), fekete nyár (black poplar, Hungarian), Peuplier noir (French)
Populus nigra, Populus = poplar (Latin); nigra = black (Latin)
Identification: Black Poplar’s leaf shape is variable, ranging from triangular to rhomboid. It is recognized by its long petiole, which allows the leaf to flutter beautifully in the wind. The bark becomes dark and fissured with age, and old trunks look rough and black. Male and female catkins occur on separate trees and appear before the leaves, while the fruits are woolly-haired, cottony seeds produced by female trees. This is a fast-growing, early-successional pioneer species that can reach 40 m in height and live up to 200 years.
Ecological Information: The Black Poplar is one of the first tall trees that grows on alluvium, the sediment from recent floods. Its natural occurrence is linked to wet river valleys of central and southern Europe. Black Poplar may be a hardy floodplain pioneer, but it is still vulnerable: the species is threatened by hybridization with cultivated poplar trees, including planted poplar hybrids of North American origin.
Sociocultural Information: Historically, Black Poplar was used as a quick source of light timber and pulp. The gum of this tree has been used to fill cracks and to glue teared cloth together. In addition, the buds of this tree have been used medicinally to eliminate uric acid buildup, treat arthritis and rheumatism, and sedate those with nervous tension.
Black Poplar has been traditionally associated with dark themes. For example, Brosse (1987) suggests that a forest of Black Poplar was once associated with the entrance to hell and that the drops of amber on the branches represent the tears of the three sisters, the Heliades. The sisters mourn the loss of their brother, Phaethon, who was struck down by Zeus to stop his out of control sun-chariot from crashing into and destroying Earth.
Today, however, the story of Black Poplar is shifting. It is increasingly used in riparian restoration projects, where its ecological value as a native floodplain pioneer is once again being recognized. In this more recent context, Black Poplar is transforming from a tree of shadow and sorrow, to one representing hope and renewal.
Black Poplar is thus a fitting floodplain tree: fast-growing and poised between disturbance and recovery, darkness and hope. It reminds us that floodplain forests are not static places, but landscapes continually being remade.
In the next post, I’ll turn to another important floodplain tree of Central Europe: Pannonian Ash. If Black Poplar is a pioneer of newly deposited alluvium, Pannonian Ash belongs more to the hardwood gallery forests and ash-oak woods that develop as floodplain systems mature.
References
Brosse, J. (1987). Les arbres de France: Histoire et légendes. Plon.
Olomouc Town Museum signs. (n.d.). Angiosperms, Gymnosperms, Coniferous Trees of the Castle Park, Broadleaf Trees of the Castle Park, and habitat/tree interpretation panels.
Vanden Broeck, A., Storme, V., Cottrell, J. E., Boerjan, W., Van Bockstaele, E., Quataert, P., & Van Slycken, J. (2004). Gene flow between cultivated poplars and native black poplar (Populus nigra L.): A case study along the river Meuse on the Dutch–Belgian border. Forest Ecology and Management, 197(1–3), 307–310.
Sense of Place 
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