Lycoris × xiui, a new wild nothospecies from Anhui, China, a hybrid between L. longituba and L. sprengeri (Amaryllidaceae)

A new wild nothospecies, Lycoris × xiui S.Y.Zhang, Ying F.Hu & J.W.Shao, from Anhui Province in eastern China, is described and illustrated based on complete chloroplast genome, morphological, and karyotype evidence. This taxon resulted from the hybridization of <i>L. longituba</i> and <i>L. sprengeri</i> and is currently known only from Langya Mountain. Phylogenetic analysis of the chloroplast genome revealed that <i>L. sprengeri</i> served as the maternal parent of all hybrid individuals sequenced. It is characterized by a karyotype of 2<i>n</i> = 19 = 3V + 16I, a perigone tube typically 1.5-3.5 cm long, and flowers usually pink to pale pink (rarely white or pale yellow), with tepal apices sometimes pale blue. These characteristics differ markedly from those of both putative parents; therefore, this study formally names the taxon and provides a detailed morphological description and diagnosis.