Orychophragmus yangii sp. nov. (Brassicaceae), a new species from Shaanxi, China

A new species, <i>Orychophragmus yangii</i> <b>sp. nov.</b>, from the Loess Plateau of Shaanxi Province, China, is described and illustrated. This species differs clearly from all other <i>Orychophragmus</i> species in the following traits: whole plant glabrous; leaves varying from simple to pinnatifid but never lyrate; pinnatifid leaves with lobes divided or not; simple leaves widest at the base; sepals green; petals white; fruit narrowly linear, terete, and glabrous; rostra of fruit 2-4 mm long. Molecular phylogenetic analyses based on plastid genomic data and nuclear ribosomal RNA genes showed that the new species represents the first divergent lineage in the genus <i>Orychophragmus</i>. The chromosome number of the new species is 2<i>n</i> = 24.