Flowering Phenology of Populus Nigra L., P. Nigra Cv. Italica and P. x Canadensis Moench. and the Potential for Natural Hybridisation in Belgium. Vanden Broeck, A., Cox, K., Quataert, P., Van Bockstaele, E., & Van Slycken, J. 52(5-6):280–283.
Flowering Phenology of Populus Nigra L., P. Nigra Cv. Italica and P. x Canadensis Moench. and the Potential for Natural Hybridisation in Belgium. [pdf]Paper  abstract   bibtex   
The presence of hybrid and exotic poplar plantations is considered to pose a severe potential threat to the native populations of Populus nigra in Western Europe. To evaluate the potential risks associated with the use of exotic or hybrid poplar plantations, particularly plantations of P. x canadensis and P. nigra cv. italica (Lombardy poplar), in the surroundings of natural P. nigra stands, the flower biology of a collection of P. nigra, P. x canadensis and P. nigra cv. italica, was assessed. The results of this study showed that, in this stand and over the two years of observation, the flowering time did not constitute a barrier to hybridisation between P. nigra and P. x canadensis. In contrast, it appears that during both springs, P. nigra cv. italica could not hybridise with native female black poplars and female P. x canadensis trees in the stand, due to non-synchrony of flowering.

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