Contributions to the knowledge of the flora of the Eastern Guilleries and nearby areas (northeastern Catalonia) – IV

We provide data on alien flora observed in the eastern area of the Guilleries massif, not previously reported in this area and that are rare or little known in Catalonia. We indicate Celtis sinensis, Miscanthus sinensis and Ophiopogon japonicus for the first time in Catalonia and we give new localities of Achillea filipendulina, Amaranthus caudatus, A. hypochondriacus, Bothriochloa barbinodis, Hyacinthus orientalis, Nandina domestica, Oenothera lindheimeri, Opuntia engelmannii subsp. lindheimeri, Solanum pseudocapsicum, S. sisymbriifolium, Verbena brasiliensis and Zephyranthes candida.