Dryopteris ningqiangensis, a new species of Dryopteridaceae from Shaanxi, China

<i>Dryopteris ningqiangensis</i>, a new fern species of Dryopteridaceae from Shaanxi, China, is described and illustrated herein. Morphologically, <i>D. ningqiangensis</i> belongs to the <i>D. varia</i> complex but is characterized by papyraceous laminae and sparsely spreading, blackish-brown scales on the stipe. Phylogenetic analyses show that <i>D. ningqiangensis</i> is of hybrid origin; its maternal parent is probably an undiscovered tetraploid <i>D. bissetiana</i>, and its paternal parent is <i>D. gymnophylla</i>.