Not regionally extinct: Rediscovery of the only European population of Utricularia subulata L. (Lentibulariaceae), in Central Portugal

Utricularia subulata L., a small annual carnivorous plant, historically known in Europe from only two localities in Central Portugal, was declared Regionally Extinct in 2020. In this paper, we report the rediscovery of U. subulata in Portugal, confirming its continued survival in the Western Palearctic. Morphological examination confirmed the identity and revealed variable spur morphology, supporting the synonymy of the previously described U. subulata var. tridenticulata with the type variety. With only 48 reproductive individuals, a restricted range, and a single location under threat, and inferred habitat and population decline we propose a preliminary regional assessment of Critically Endangered [CR B1ab(iii)+2ab(iii)+C2a(ii)].