Hyoscyamus labiatus sp. nov. (Solanaceae) from Henan, China: implications for the delimitation of Hyoscyamus.

Hyoscyamus labiatus Y. Y. Liu, Q. R. Wang and J. M. Li, a new species of Hyoscyamus (Solanaceae) from Henan province, China, is described and illustrated here. It is morphologically similar to the known species of Hyoscyamus and Archihyoscyamus, but can be distinguished by corolla 2‐lipped, adaxial lip 3‐lobed and much longer than abaxial lips, tube slender at base, and stamens 5, inserted on inner side of disk, free, obviously unequal, and exceeding corolla. To infer the systematic position of this new species, phylogenetic analysis was performed based on four chloroplast markers, viz rbcL, ndhF, trnC‐psbM and trnL‐F. According to the phylogenetic tree, Hyoscyamus labiatus is strongly supported as sister to a monophyletic group containing all species of Hyoscyamus and Archihyoscyamus previously described. Morphological comparison and molecular phylogeny confirmed the identity of the species as a new taxon, and that Archihyoscyamus should be included in Hyoscyamus. [ABSTRACT FROM AUTHOR]