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Conservatoire botanique national des Pyrénées et de Midi-Pyrénées

Segarra-Moragues, J.G., Villar, L., López, J., Pérez-Collazos, E., López, J., Pérez-Collazos, E., Catalán, P., 2007 . A new Pyrenean hybrid Cirsium (Asteraceae) as revealed by morphological and molecular analyses. Botanical journal of the Linnean Society, 154 : 421-434 + 3 fig..