Lonicera lanzhouensis (Caprifoliaceae), a new species from Gansu, Northwest China

<i>Loniceralanzhouensis</i> (Caprifoliaceae), a new species from Lanzhou City, Gansu province, China, is described and illustrated. The new species is morphologically similar to <i>L.webbiana</i> in that it has a bilabiate corolla and a long peduncle. It differs by narrowly lanceolate leaves (vs. ovate to ovate-lanceolate), yellow-green corolla at the beginning and reddish-purple when mature (vs. purple-red) and long involucral bracts (vs. short). The new species is supported by the genetic differentiation and phylogenetic analysis based on ITS and the combined sequences of chloroplast <i>psb</i>A-<i>trn</i>H and <i>mat</i>K fragments.