Carya luana C.‐Y. Deng et X.‐G. Xiang, sp. nov. (Juglandaceae), a new species from Guizhou, China, identified based on whole plastome phylogeny and morphometrics

Carya luana sp. nov., a new species of Juglandaceae from Guizhou, China, is described and illustrated. The new species is easily distinguished from other Carya species by having lanceolate leaflets and obovate fruits with a 4–6 mm thick husk, but is otherwise morphologically close to C. tonkinensis and C. kweichowensis . Based on phylogenetic reconstruction of whole plastomes, C. luana is the sister of C. tonkinensis , while formed a clade with C. tonkinensis and C. hunanensis on ITS. A morphometric analysis demonstrate that C. luana , C. tonkinensis and C. kweichowensis are morphologically distinct. The conservation status of C. luana is assessed as Endangered (EN) according to the IUCN Red List Categories and Criteria. A new identification key to all Asian Carya species is provided.