Impatiens ngariensis (Balsaminaceae), a new species from Xizang, China

A new species, Impatiens ngariensis (Balsaminaceae) from western Xizang, China, is described in this study. Morphological and phylogenetic evidence supports its taxonomic placement within I. sect. Racemosae . Phylogenetic analyses indicate that I. ngariensis forms a clade with I. thomsonii , I. bomiensis , I. fragicolor , I. edgeworthii and I. glandulifera . Morphologically, the new species closely resembles I. sulcata in petiole with 2 basal glands, subcorymbose-racemose inflorescences, lateral sepals ovate, dorsal petal suborbicular and capsule linear, but can be distinguished by several key characteristics, including a suborbicular dorsal petal with a cordate base and a shorter spur.