TWO NEW HYBRID DAFFODILS (NARCISSUS, AMARYLLIDACEAE) FROM NORTHERN EXTREMADURA (CÁCERES, SPAIN)

Abstract

Hybridization is since long time considered a major force shaping the diversity of daffodils (Fernandes 1967), where it is well-documented at the homoploid (Sánchez & Castro 2011, Barra & Ureña 2014, Hervás et al. 2018, López Tirado 2018, 2019, and many others) and polyploid levels (Díaz Lifante et al. 2009, Marques et al. 2016, Marques et al. 2017). Hybrid zones and introgression have also been studied in Narcissus (Marques et al. 2011), as well as the occurrence of orphan hybrid populations (Marques et al. 2010), and within-species polyploid and aneuploid series (Barra & López 1984). To our knowledge, and despite morphological trait inheritance in Narcissus has not been specifically addressed (but see Marques et al. 2011), reciprocal crosses between two given co-occurring species produce F1 offspring more closely resembling one of the parents (heterogamy, Correns 1909) and display a marked maternal effect (Roach & Wulff 1987). While overall uncommon among angiosperms (de Vries 1911) heterogamy has been repeatedly reported in Asparagales (for instance in orchids, Bateman et al. 2008, Bateman et al. 2017).