Populus nigra nigra, Taxa Only, Exact Match: 2 Treatments

Populus nigra subsp. nigra			Konrad Lauber, Gerhart Wagner & Andreas Gygax, 2018, Flora Helvetica - Salicaceae, Flora Helvetica, Bern: Haupt Verlag, pp. 428-446 : 444	444
Populus nigra subsp. nigra			Info Flora, 2021, Info Flora Schweiz - Salicaceae, https://www.infoflora.ch/de/flora/salicaceae.html (accessed 2023-10-20) : -1	-1